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The GALAH survey : ...
The GALAH survey : Unresolved triple Sun-like stars discovered by the Gaia mission
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- Čotar, Klemen (författare)
- University of Ljubljana
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- Zwitter, Tomaž (författare)
- University of Ljubljana
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- Traven, Gregor (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Kos, Janez (författare)
- University of Ljubljana
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- Asplund, Martin (författare)
- Australian National University
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- Bland-Hawthorn, Joss (författare)
- University of Sydney,University of California, Berkeley
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- Buder, Sven (författare)
- Max Planck Institute for Astronomy
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- D'Orazi, Valentina (författare)
- INAF - Osservatorio Astronomico di Padova
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- De Silva, Gayandhi M. (författare)
- Macquarie University, Sydney
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- Lin, Jane (författare)
- Australian National University
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- Martell, Sarah L. (författare)
- University of New South Wales
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- Sharma, Sanjib (författare)
- University of Sydney
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- Simpson, Jeffrey D. (författare)
- University of New South Wales
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- Zucker, Daniel B. (författare)
- Macquarie University, Sydney
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- Horner, Jonathan (författare)
- University of Southern Queensland
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- Lewis, Geraint F. (författare)
- University of Sydney
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- Nordlander, Thomas (författare)
- Australian National University
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- Ting, Yuan Sen (författare)
- Princeton University,Carnegie Observatories
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- Wittenmyer, Rob A. (författare)
- University of Southern Queensland
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(creator_code:org_t)
- 2019-05-21
- 2019
- Engelska 17 s.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 487:2, s. 2474-2490
- Relaterad länk:
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http://dx.doi.org/10...
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https://academic.oup...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The latest Gaia data release enables us to accurately identify stars that are more luminous than would be expected on the basis of their spectral type and distance. During an investigation of the 329 best solar twin candidates uncovered among the spectra acquired by the GALAH survey, we identified 64 such overluminous stars. In order to investigate their exact composition, we developed a data-driven methodology that can generate a synthetic photometric signature and spectrum of a single star. By combining multiple such synthetic stars into an unresolved binary or triple system and comparing the results to the actual photometric and spectroscopic observations, we uncovered 6 definitive triple stellar system candidates and an additional 14 potential candidates whose combined spectrum mimics the solar spectrum. Considering the volume correction factor for a magnitude-limited survey, the fraction of probable unresolved triple stars with long orbital periods is ~2 per cent. Possible orbital configurations of the candidates were investigated using the selection and observational limits. To validate the discovered multiplicity fraction, the same procedure was used to evaluate the multiplicity fraction of other stellar types.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Binaries: general
- Galaxy: stellar content
- Methods: data analysis
- Stars: solar-type
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Čotar, Klemen
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Zwitter, Tomaž
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Traven, Gregor
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Kos, Janez
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Asplund, Martin
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Bland-Hawthorn, ...
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visa fler...
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Buder, Sven
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D'Orazi, Valenti ...
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De Silva, Gayand ...
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Lin, Jane
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Martell, Sarah L ...
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Sharma, Sanjib
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Simpson, Jeffrey ...
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Zucker, Daniel B ...
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Horner, Jonathan
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Lewis, Geraint F ...
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Nordlander, Thom ...
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Ting, Yuan Sen
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Wittenmyer, Rob ...
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