WFRF:(Nyman Lars Åke)
Sökning: WFRF:(Nyman Lars Åke) > ALMA observations o...
LIBRIS Formathandbok (Information om MARC21)
| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 06330naa a2200661 4500 | |
| 001 | oai:research.chalmers.se:7f790bd0-1a5e-419c-bd50-e55c32984b38 | |
| 003 | SwePub | |
| 008 | 171007s2015 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://doi.org/10.1051/0004-6361/2014251892 DOI |
| 024 | 7 | a https://research.chalmers.se/publication/2257022 URI |
| 040 | a (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a for2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Liseau, René,d 1949u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)liseau |
| 245 | 1 0 | a ALMA observations of α Centauri. First detection of main-sequence stars at 3 mm wavelength |
| 264 | c 2014-12-19 | |
| 264 | 1 | b EDP Sciences,c 2015 |
| 338 | a electronic2 rdacarrier | |
| 520 | a Context. The precise mechanisms that provide the non-radiative energy for heating the chromosphere and the corona of the Sun and those of other stars constitute an active field of research. By studying stellar chromospheres one aims at identifying the relevant physical processes. Defining the permittable extent of the parameter space can also serve as a template for the Sun-as-a-star. This feedback will probably also help identify stars that potentially host planetary systems that are reminiscent of our own.Aims: Earlier observations with Herschel and APEX have revealed the temperature minimum of α Cen, but these were unable to spatially resolve the binary into individual components. With the data reported in this Letter, we aim at remedying this shortcoming. Furthermore, these earlier data were limited to the wavelength region between 100 and 870 μm. In the present context, we intend to extend the spectral mapping (SED) to longer wavelengths, where the contrast between stellar photospheric and chromospheric emission becomes increasingly evident.Methods: The Atacama Large Millimeter/submillimeter Array (ALMA) is particularly suited to point sources, such as unresolved stars. ALMA provides the means to achieve our objectives with both its high sensitivity of the collecting area for the detection of weak signals and the high spatial resolving power of its adaptable interferometer for imaging close multiple stars.Results: This is the first detection of main-sequence stars at a wavelength of 3 mm. Furthermore, the individual components of the binary α Cen AB are clearly detected and spatially well resolved at all ALMA wavelengths. The high signal-to-noise ratios of these data permit accurate determination of their relative flux ratios, i.e., SyB / SyA> = 0.54 ± 0.04 at 440 μm, = 0.46 ± 0.01 at 870 μm, and = 0.47 ± 0.006 at 3.1 mm, respectively.Conclusions: The previously obtained flux ratio of 0.44±0.18, which was based on measurements in the optical and at 70 μm, is consistent with the present ALMA results, albeit with a large error bar. The observed 3.1 mm emission greatly exceeds what is predicted from the stellar photospheres, and undoubtedly arises predominantly as free-free emission in the ionized chromospheric plasmas of both stars. Given the distinct difference in their cyclic activity, the similarity of their submm SEDs appears surprising. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 653 | a αCentauri AB | |
| 653 | a stars: chromospheres | |
| 653 | a binaries: general | |
| 653 | a submillimeter: stars | |
| 653 | a stars: solar-type | |
| 653 | a stars | |
| 653 | a radio continuum: | |
| 653 | a stars: individual: | |
| 700 | 1 | a Vlemmings, Wouter,d 1974u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)wouterv |
| 700 | 1 | a Bayo, A.u Universidad de Valparaíso,University of Valparaíso4 aut |
| 700 | 1 | a Bertone, E.u Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)4 aut |
| 700 | 1 | a Black, John H,d 1949u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)jblack |
| 700 | 1 | a del Burgo, C.u Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)4 aut |
| 700 | 1 | a Chavez, M.u Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)4 aut |
| 700 | 1 | a Danchi, W.u NASA Goddard Space Flight Center4 aut |
| 700 | 1 | a De la Luz, V.u Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico4 aut |
| 700 | 1 | a Eiroa, C.u Universidad Autonoma de Madrid (UAM)4 aut |
| 700 | 1 | a Ertel, S.u European Southern Observatory Santiago4 aut |
| 700 | 1 | a Fridlund, Malcolm,d 1952u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)malfri |
| 700 | 1 | a Justtanont, Kay,d 1965u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)justtano |
| 700 | 1 | a Krivov, A.u Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena4 aut |
| 700 | 1 | a Marshall, J. P.u University of New South Wales (UNSW)4 aut |
| 700 | 1 | a Mora, A.u European Space Astronomy Centre (ESAC)4 aut |
| 700 | 1 | a Montesinos, B.u Centro de Astrobiologia (CAB)4 aut |
| 700 | 1 | a Nyman, Lars-Åke,d 1954u Atacama Large Millimeter-submillimeter Array (ALMA)4 aut |
| 700 | 1 | a Olofsson, G.u Stockholms universitet,Stockholm University4 aut |
| 700 | 1 | a Sanz-Forcada, J.u Centro de Astrobiologia (CAB)4 aut |
| 700 | 1 | a Thébault, P.4 aut |
| 700 | 1 | a White, G. J.u STFC Rutherford Appleton Laboratory,Open University4 aut |
| 710 | 2 | a Chalmers tekniska högskolab Universidad de Valparaíso4 org |
| 773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 573, s. L4 (4 pages)-q 573<L4 (4 pages)-x 0004-6361x 1432-0746 |
| 856 | 4 | u http://publications.lib.chalmers.se/records/fulltext/225702/local_225702.pdfx primaryx freey FULLTEXT |
| 856 | 4 | u https://www.aanda.org/articles/aa/pdf/2015/01/aa25189-14.pdf |
| 856 | 4 8 | u https://doi.org/10.1051/0004-6361/201425189 |
| 856 | 4 8 | u https://research.chalmers.se/publication/225702 |
Hitta via bibliotek
- Astronomy and Astrophysics (Sök värdpublikationen i LIBRIS)
Till lärosätets databas
Hitta mer i SwePub
- Av författaren/redakt...
- Liseau, René, 19 ...
- Vlemmings, Woute ...
- Bayo, A.
- Bertone, E.
- Black, John H, 1 ...
- del Burgo, C.
- visa fler...
- Chavez, M.
- Danchi, W.
- De la Luz, V.
- Eiroa, C.
- Ertel, S.
- Fridlund, Malcol ...
- Justtanont, Kay, ...
- Krivov, A.
- Marshall, J. P.
- Mora, A.
- Montesinos, B.
- Nyman, Lars-Åke, ...
- Olofsson, G.
- Sanz-Forcada, J.
- Thébault, P.
- White, G. J.
- visa färre...
- Om ämnet
-
- NATURVETENSKAP
- NATURVETENSKAP
- och Fysik
- och Astronomi astrof ...
- Artiklar i publikationen
- Astronomy and As ...
- Av lärosätet
- Chalmers tekniska högskola
Sök utanför SwePub
- Sök vidare i:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - Nationella bibliotekssystem
- LIBRIS.kb.se
