SwePub - sökning: L773:0365 0138

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1.	Abramowski, A., et al. (författare) Discovery of variable VHE gamma-ray emission from the binary system 1FGL J1018.6-5856 2015 Ingår i: Astronomy and Astrophysics Supplement Series. - : EDP Sciences. - 0365-0138 .- 1286-4846. ; 577 Tidskriftsartikel (refereegranskat)abstract Re-observations with the HESS telescope array of the very high-energy (VHE) source HESS J1018-589 A that is coincident with the Fermi-LAT γ-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than 9σ and the detection of variability (χ$^2$/ν of 238.3/155) in the emitted γ-ray flux. This variability confirms the association of HESS J1018-589 A with the high-energy γ-ray binary detected by Fermi-LAT and also confirms the point-like source as a new VHE binary system. The spectrum of HESS J1018-589 A is best fit with a power-law function with photon index Γ = 2.20 \plusmn 0.14$_stat$ \plusmn 0.2$_sys$. Emission is detected up to ~20 TeV. The mean differential flux level is (2.9 \plusmn 0.4) \times 10$^-13$ TeV$^-1$ cm$^-2$ s$^-1$ at 1 TeV, equivalent to ~1% of the flux from the Crab Nebula at the same energy. Variability is clearly detected in the night-by-night light curve. When folded on the orbital period of 16.58 days, the rebinned light curve peaks in phase with the observed X-ray and high-energy phaseograms. The fit of the HESS phaseogram to a constant flux provides evidence of periodicity at the level of N$_sigma$\gt 3σ. The shape of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with amodest impact from VHE γ-ray absorption due to pair production (τ \lsim 1 at 300 GeV).
2.	Barklem, Paul, et al. (författare) A list of data for the broadening of metallic lines by neutral hydrogen collisions 2000 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - 0365-0138. ; 142:3, s. 467-473 Tidskriftsartikel (refereegranskat)
3.	BERGVALL, N, et al. (författare) A STUDY OF A COMPLETE SAMPLE OF INTERACTING GALAXIES .2. IMAGES, COLOR DISTRIBUTIONS AND SPECTRA 1995 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 113:3, s. 499-537 Tidskriftsartikel (refereegranskat)abstract We present broadband images, two-colour maps and spectra of a magnitude limited sample of interacting and merging galaxies.
4.	Bååth, Lars, 1948-, et al. (författare) High resolution interferometry of the QSO 1422+202 1997 Ingår i: Astronomy and Astrophysics. Supplement Series. - Berlin : Springer. - 1286-4846 .- 0365-0138. ; 125:1, s. 453-458 Tidskriftsartikel (refereegranskat)abstract We present VLA A-array observations at 8.4 and 15GHz and European VLBI Network (EVN) observations at 1.6GHz of the radio source 1422+202. It is suggested that 1422+202 is a Medium-size Object in the evolutionary sequence from Compact Steep-spectrum Sources to larger sized radio sources. The VLBI data were analysed with the phase referencing technique and we show that the EVN can work as a phase stable instrument for separations between the calibrator source and the target source up to ~ 10 degrees. With the VLA and VLBI observations we investigate some of the issues about the nucleus of 1422+202 and we discuss the possible cause for the low frequency variability detected while monitoring the source.
5.	de Val-Borro, Miguel, et al. (författare) Vortex Generation in Protoplanetary Disks with an Embedded Giant Planet 2007 Ingår i: Astronomy & Astrophysics. - 0365-0138. ; 471:3, s. 1043-1055 Tidskriftsartikel (refereegranskat)
6.	deLaverny, P, et al. (författare) Long-term UBV(RI)(c) monitoring of 12 southern hemisphere Long Period Variables 1997 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 122:3, s. 415-432 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract A program of UBV(RI)(c) photometric observations of twelve southern hemisphere Long Period Variables (LPV or Miras) has been carried out at the European Southern Observatory. Each star was observed on at least 11 occasions up to 29 over a 4-year period. A
7.	Feltzing, Sofia, et al. (författare) Abundances in metal-rich stars. Detailed abundance analysis of 47 G and K dwarf stars with [Me/H] > 0.10 dex 1998 Ingår i: Astronomy and Astrophysics Supplement Series. - : EDP Sciences. - 0365-0138 .- 1286-4846. ; 129, s. 237-266 Tidskriftsartikel (refereegranskat)abstract We have derived elemental abundances of O, Na, Mg, Al, Si, Ca, Ti, Cr, Mn, Fe, Co, Ni as well as for a number of s-elements for 47 G and K dwarf, with [Me/H]>0.1 dex. The selection of stars was based on their kinematics as well as on their uvby-beta photometry. One sample of stars on rather eccentric orbits traces the chemical evolution interior to the solar orbit and another, on circular orbits, the evolution around the solar orbit. A few Extreme Population I stars were included in the latter sample. The stars have -0.1 dex < [Fe/H] < 0.42 dex. The spectroscopic [Fe/H] correlate well with the [Me/H] derived from uvby-beta photometry. We find that the elemental abundances of Mg, Al, Si, Ca, Ti, Cr and Ni all follow [Fe/H]. Our data put further constraints on models of galactic chemical evolution, in particular of Cr, Mn and Co which have not previously been studied for dwarf stars with [Me/H] >0.1 dex. The increase in [Na/Fe] and [Al/Fe] as a function of [Fe/H] found previously by cite[Edvardsson et al. (1993a)]{Edv93} has been confirmed for [Na/Fe]. This upturning relation, and the scatter around it, are shown not to be due to a mixture of populations with different mean distances to the galactic centre. We do not confirm the same trend for aluminium, which is somewhat surprising since both these elements are thought to be produced in the same environments in the pre-supernova stars. Nor have we been able to trace any tendency for relative abundances of O, Si, and Ti relative to Fe to vary with the stellar velocities, i.e. the stars present mean distance to the galactic centre. These results imply that there is no significant difference in the chemical evolution of the different stellar populations for stars with [Me/H]>0.1 dex. We find that [O/Fe] continue to decline with increasing [Fe/H] and that oxygen and europium correlate well. However [Si/Fe] and [Ca/Fe] seem to stay constant. A real (``cosmic'') scatter in [Ti/Fe] at given [Fe/H] is suggested as well as a decreasing abundance of the s-elements relative to iron for the most metal-rich dwarf stars. We discuss our results in the context of recent models of galactic chemical evolution. In our sample we have included a few very metal rich stars, sometimes called SMR (super metal rich) stars. We find these stars to be among the most iron-rich in our sample but far from as metal-rich as indicated by their photometric metallicities. SMR stars on highly eccentric orbits, alleged to trace the evolution of the chemical evolution in the galactic Bulge, have previously been found overabundant in O, Mg and Si. We have included three such stars from the study by cite[Barbuy & Grenon (1990)]{Bar90}. We find them to be less metal rich and the other elemental abundances remain puzzling. Detailed spectroscopic abundance analyses of K dwarf stars are rare. Our study includes 5 K dwarf stars and has revealed what appears to be a striking example of overionization. The overionization is especially prominent for Ca, Cr and Fe. The origin of this apparent overionization is not clear and we discuss different explanations in some detail. Based on observations at the McDonald Observatory.
8.	Feltzing, Sofia, et al. (författare) Abundances in metal-rich stars - Detailed abundance analysis of 47 G and K dwarf stars with [Me/H]> 0.10 dex 1998 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : E D P SCIENCES. - 0365-0138. ; 129:2, s. 237-266 Tidskriftsartikel (refereegranskat)abstract We have derived elemental abundances of O, Na, Mg, Al, Si, Ca, Ti, Cr, Mn, Fe, Co, Ni as well as for a number of s-elements for 47 G and K dwarf, with [Me/H]> 0.1 dex. The selection of stars was based on their kinematics as well as on their uvby - beta ph
9.	GARCIA, JR, et al. (författare) A CATALOG OF VARIABLE-STARS IN THE LOWER INSTABILITY STRIP 1995 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - 0365-0138. ; 109:2, s. 201-262 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Identifications, positions, photometry, spectra, some pulsational features, other astrophysical parameters and literature for 302 pulsating variable stars in the lower instability strip, near the ZAMS, are given. About 185 stars have near homogeneous phot
10.	Hernius, O, et al. (författare) Astrometry of outer Jovian satellites from the Uppsala-ESO survey of asteroids and comets (UESAC) 1996 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 115:2, s. 295-296 Tidskriftsartikel (refereegranskat)abstract In the course of The Uppsala-ESO Survey of Asteroids and Comets astrometric positions of the faint outer Jovian satellites J VI-XIII were obtained from photographic plates and films taken at the European Southern Observatory, La Silla, Chile and at the An
11.	Jetsu, L, et al. (författare) Photometry of V 1794 Cygni between 1975 and 1995 1999 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : E D P SCIENCES. - 0365-0138. ; 139:3, s. 513-523 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Six years of new photometry of V 1794 Cyg is combined with the previously published data. These data are processed into two decades of homogeneous standard Johnson UBVRI photometry, which contains 1207, 1837, 1927, 867 and 75 observations in U, B, V, R an
12.	Kupka, F., et al. (författare) VALD-2 : Progress of the Vienna Atomic Line Data Base 1999 Ingår i: Astronomy and Astrophysics Supplement Series. - : EDP Sciences. - 0365-0138 .- 1286-4846. ; 138:1, s. 119-133 Tidskriftsartikel (refereegranskat)
13.	Lagerkvist, Claes-Ingvar, et al. (författare) 186 Celuta - A slowly spinning asteroid 1978 Ingår i: Astronomy and Astrophysics Supplement Series. - 0365-0138 .- 1286-4846. ; 32, s. 339-342 Tidskriftsartikel (refereegranskat)
14.	LAGERKVIST, CI, et al. (författare) PHYSICAL STUDIES OF ASTEROIDS .29. PHOTOMETRY AND ANALYSIS OF 27 ASTEROIDS 1995 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 113:1, s. 115-129 Tidskriftsartikel (refereegranskat)abstract In this paper photometry and analysis of 27 asteroids are presented. For the asteroids 21 Lutetia, 23 Thalia, 250 Bettina and 135 Hertha spin vector determinations were made. For asteroid 99 Dike we derived a rotation period of 10.35 hours and for 1280 Ba
15.	Lagerkvist, CI, et al. (författare) Physical studies of asteroids - XXXIII. The spin rate of M-type asteroids 1998 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : E D P SCIENCES. - 0365-0138. ; 131:1, s. 55-62 Tidskriftsartikel (refereegranskat)abstract The results from photometric lightcurve observations of nine M-type asteroids are presented. New rotation periods were determined for 6 asteroids: 217 Eudora (12.54 h), 322 Phaeo (17.56 h), 572 Rebekka (5.65 h), 757 Portland (6.58 h), 857 Glasenappia (8.2
16.	LINDE, P, et al. (författare) A STUDY OF CLUSTERS AND FIELD STARS IN 2 REGIONS IN THE LARGE MAGELLANIC CLOUD .1. CCD PHOTOMETRY IN B AND V 1995 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 110:3, s. 533-543 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract We present CCD photometry in the Johnson BV system to about V = 23(m) for the stars in six clusters and the surrounding fields in two regions of different nature in the Large Magellanic Cloud. The analysis includes estimations of loss of measured stars du
17.	Lindgren, T, et al. (författare) Searching for comets encountering Jupiter. Second campaign observations and further constraints on the size of the Jupiter family population 1996 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 118:2, s. 293-301 Tidskriftsartikel (refereegranskat)abstract The results from the second campaign of the search for comets in the vicinity of Jupiter are presented. As in the previous campaign, we find no comets. This result is used to calculate upper limits on the size of the Jupiter family population of comets. T
18.	LODEN, LO, et al. (författare) NOTE ON THE RADIAL-VELOCITIES OF 10 SOUTHERN STARS 1995 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 112:1, s. 9-11 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract Echelle spectrograms of the stars HD 55857, 57219, 62623, 83058, 84400, 86087, 86523, 89461, 90898, 96446 have been obtained in 1991 as part of an investigation of stars previously classified as both chemically peculiar and high luminosity B and A stars.
19.	OLOFSSON, KJELL (författare) SYNTHETIC ABSORPTION-LINE STRENGTHS IN STAR-FORMING REGIONS, AND THE EFFECTS ON THE HELIUM ABUNDANCE DETERMINATION 1995 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 111:1, s. 57-73 Tidskriftsartikel (refereegranskat)abstract Spectral evolutionary calculations have been employed in order to follow the behaviour of absorption lines in single-burst star forming regions. The model calculations are based on theoretical evolutionary tracks and model atmosphere stellar spectra at 5
20.	Ostensen, R, et al. (författare) ESO & NOT photometric monitoring of the Cloverleaf quasar 1997 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : E D P SCIENCES. - 0365-0138. ; 126:3, s. 393-400 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract The Cloverleaf quasar, H1413+117, has been photometrically monitored at ESO (La Silla, Chile) and with the NOT (La Palma, Spain) during the period 1987-1994. All good quality CCD frames have been successfully analysed using two independent methods (i.e. a
21.	Ostlin, G, et al. (författare) Dynamics of blue compact galaxies, as revealed by their H alpha velocity fields I. The data, velocity fields and rotation curves 1999 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : E D P SCIENCES. - 0365-0138. ; 137:3, s. 419-444 Tidskriftsartikel (refereegranskat)abstract Observations of six luminous blue compact galaxies (BCGs) and two star forming companion galaxies were carried out with the CIGALE scanning Fabry-Perot interferometer attached to the ESO 3.6 m telescope on La Silla. The observations were made in the H alp
22.	Pettersson, Bertil (författare) An objective-prism survey for Hα-emission-line stars of a field in Puppis 1987 Ingår i: Astronomy and Astrophysics Supplement Series. - 0365-0138. ; 70, s. 69-75 Tidskriftsartikel (refereegranskat)abstract 52 new H-alpha-emission-line objects have been found in an objective-prism survey covering 27 square degrees in the north-western quadrant of the Gum Nebula, centered north of the H II-region RCW 19 Iris photometry of the stars and photoelectric photometry for calibration of the iris photometry are presented. Accurate coordinates are given.
23.	Pettersson, Bertil, et al. (författare) Young stars associated with the VELA Molecular Ridge. I. VMR clouds C and D, Collinder 197 and VELA R2 1994 Ingår i: Astronomy and Astrophysics Supplement Series. - Les Ulis : Les Editions de Physique. - 0365-0138 .- 1286-4846. ; 104, s. 233-258 Tidskriftsartikel (refereegranskat)abstract An objective prism survey for Hα-emission-line stars towards the HII regions RCW 27, 32 and 33 and the northwestern parts of the Vela Molecular Ridge is presented. 278 Hα-emitting objects have been found and their relation to the HII regions and to dark clouds in the area is discussed. We identify what appears to be two new large associations of T Tauri stars, Vela T1 and T2, at a distance of 1 kpc. The relation of low-mass Hα-emission stars with the Vela Molecular Ridge is discussed.
24.	Piironen, J, et al. (författare) Physical studies of asteroids .31. Asteroid photometric observations with the Carlsberg Automatic Meridian Circle 1997 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 121:3, s. 489-497 Tidskriftsartikel (refereegranskat)abstract Photometric observations of 74 asteroids obtained with the Carlsberg Automatic Meridian Circle between January 1990 and December 1993 are presented. The data from individual asteroid apparitions have been fitted by phase curves based on the standard HG ma
25.	Piironen, J, et al. (författare) Physical studies of asteroids - XXXII. Rotation periods and UBVRI-colours for selected asteroids 1998 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : E D P SCIENCES. - 0365-0138. ; 128:3, s. 525-540 Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract We present lightcurves of selected asteroids. Most of the asteroids were included to obtain refined spin periods. Enhanced periods were determined for 11 Parthenope, 306 Unitas and 372 Palma. We confirmed the spin periods of 8 Flora, 13 Egeria, 71 Niobe,
26.	Tancredi, G, et al. (författare) A catalog of observed nuclear magnitudes of Jupiter family comets 2000 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : E D P SCIENCES. - 0365-0138. ; 146:1, s. 73-90 Tidskriftsartikel (refereegranskat)abstract A catalog of a sample of 105 Jupiter family (JF) comets (defined as those with Tisserand constants T > 2 and orbital periods P < 20 yr) is presented with our "best estimates" of their absolute nuclear magnitudes H-N = V(1,0,0). The catalog includes all th
27.	Valenti, JA, et al. (författare) Spectroscopy made easy: A new tool for fitting observations with synthetic spectra 1996 Ingår i: Astronomy & Astrophysics Supplement Series. - 0365-0138. ; 118:3, s. 595-603 Tidskriftsartikel (refereegranskat)
28.	van Genderen, A. M., et al. (författare) VBLUW photometry of the association Sco OB1 (containing the open cluster NGC 6231). A discussion on the evolutionary status of the hypergiant zeta 1 Sco (B1 Ia +) 1984 Ingår i: Astronomy and Astrophysics Supplement Series. - 0365-0138 .- 1286-4846. ; 58:3, s. 537-548548 Tidskriftsartikel (refereegranskat)abstract VBLUW photometry of nearly 190 stars in the very young association Sco OB1, including the cluster NGC 6231, is presented and discussed. Temperature and surface gravity are determined with the aid of theoretical colours. Individual reddenings are also obtained. The distance modulus ( m- M) 0=11.00plusmn0.25 is similar to the value found by Shobbrook (1983). It appears that the reddening is not uniformly distributed across the association (~2degtimes1deg), but that areas of low and high reddening, varying from E( B- V) J=0.35 up to 0.67, can be distinguished. Practically all reddening is caused by dust in the local spiral arm up to a distance of at most 700 pc from the Sun. The Sagittarius-Carina arm where Sco OB1 is situated is practically transparent over a distance of ~0.5 kpc. The kinematical age of ~10 6 yr is in reasonable agreement with the average evolutionary age of ~(3.6plusmn0.6)times10 6 yr of the 12 brightest stars. The evolutionary status of the hypergiant zeta 1 Sco (B1 Ia +) is discussed
29.	VELICHKO, FP, et al. (författare) LIGHTCURVES, MAGNITUDE-PHASE DEPENDENCE AND SPIN VECTOR OF ASTEROID 675-LUDMILLA 1995 Ingår i: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES. - : EDITIONS PHYSIQUE. - 0365-0138. ; 110:1, s. 125-129 Tidskriftsartikel (refereegranskat)abstract During the 1991 and 1993 oppositions, photoelectric photometry of the asteroid 675 Ludmilla was carried out. Composite lightcurves in V and colour curve in B - V, as well as magnitude-phase dependences are presented. The spin vector direction was determin

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