Sökning: onr:"swepub:oai:DiVA.org:uu-390639" >
Keck HIRES spectros...
Keck HIRES spectroscopy of SkyMapper commissioning survey candidate extremely metal-poor stars
-
- Marino, A. F. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, IT-35122 Padua, Italy;CISAS, Ctr Ateneo Studi & Attivita Spaziali Giuseppe Col, IT-35131 Padua, Italy
-
- Da Costa, G. S. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
-
- Casey, A. R. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Monash Univ, Sch Phys & Astron, Wellington Rd, Clayton, Vic 3800, Australia;Monash Univ, Fac Informat Technol, Wellington Rd, Clayton, Vic 3800, Australia
-
visa fler...
-
- Asplund, M. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia
-
- Bessell, M. S. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
-
- Frebel, A. (författare)
- MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
-
- Keller, S. C. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
-
- Lind, Karin (författare)
- Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
-
- Mackey, A. D. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
-
- Murphy, S. J. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Univ New South Wales, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia
-
- Nordlander, T. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia
-
- Norris, J. E. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
-
- Schmidt, B. P. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
-
- Yong, D. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
-
visa färre...
-
(creator_code:org_t)
- 2019-03-07
- 2019
- Engelska.
-
Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 485:4, s. 5153-5167
- Relaterad länk:
-
https://dspace.mit.e...
-
visa fler...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- We present results from the analysis of high-resolution spectra obtained with the Keck HIRES spectrograph for a sample of 17 candidate extremely metal-poor (EMP) stars originally selected from commissioning data obtained with the SkyMapper telescope. Fourteen of the stars have not been observed previously at high dispersion. Three have [Fe/H] <= -3.0, while the remainder, with two more metal-rich exceptions, have -3.0 <= [Fe/H] <= -2.0 dex. Apart from Fe, we also derive abundances for the elements C, N, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, and Zn, and for n-capture elements Sr, Ba, and Eu. None of the current sample of stars is found to be carbon-rich. In general, our chemical abundances follow previous trends found in the literature, although we note that two of the most metal-poor stars show very low [Ba/Fe] (similar to-1.7) coupled with low [Sr/Ba] (similar to-0.3). Such stars are relatively rare in the Galactic halo. One further star, and possibly two others, meet the criteria for classification as a r-I star. This study, together with that of Jacobson et al. (2015), completes the outcomes of the SkyMapper commissioning data survey for EMP stars.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: abundances
- stars: Population II
- Galaxy: halo
- Galaxy: stellar content
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Marino, A. F.
-
Da Costa, G. S.
-
Casey, A. R.
-
Asplund, M.
-
Bessell, M. S.
-
Frebel, A.
-
visa fler...
-
Keller, S. C.
-
Lind, Karin
-
Mackey, A. D.
-
Murphy, S. J.
-
Nordlander, T.
-
Norris, J. E.
-
Schmidt, B. P.
-
Yong, D.
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Fysik
-
och Astronomi astrof ...
- Artiklar i publikationen
-
Monthly notices ...
- Av lärosätet
-
Uppsala universitet