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The GALAH survey :
The GALAH survey : multiple stars and our Galaxy: I. A comprehensive method for deriving properties of FGK binary stars?
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- Traven, G. (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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- Feltzing, S. (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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- Merle, T. (författare)
- Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.,Université Libre de Bruxelles (ULB)
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- Van der Swaelmen, M. (författare)
- INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,INAF - Osservatorio Astrofisico di Arcetri,University of New South Wales,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Cotar, K. (författare)
- Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.,University of Ljubljana
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- Church, R. (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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- Zwitter, T. (författare)
- Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.,University of Ljubljana
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- Ting, Y-S (författare)
- Inst Adv Study, Princeton, NJ 08540 USA.;Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA.;Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA.,Carnegie Observatories,Institute for Advanced Study, Princeton,Princeton University,University of Sydney,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Sahlholdt, C. (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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- Asplund, M. (författare)
- ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia.;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.,Australian National University,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Bland-Hawthorn, J. (författare)
- ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia.;Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia.,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney
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- De Silva, G. (författare)
- Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia.,Macquarie University, Sydney
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- Freeman, K. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.,Australian National University
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- Martell, S. (författare)
- ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia.;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.
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- Sharma, S. (författare)
- ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia.;Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia.,Australian National University,Max Planck Institute for Astronomy,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Zucker, D. (författare)
- Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia.;Macquarie Univ, Res Ctr Astron Astrophys & Astrophoton, Sydney, NSW 2109, Australia.,Macquarie University, Sydney
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- Buder, S. (författare)
- ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia.;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;Max Planck Inst Astron MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany.
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- Casey, A. (författare)
- Monash Univ, Monash Ctr Astrophys MoCA, Clayton, Vic 3800, Australia.;Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia.;Monash Univ, Fac Informat Technol, Clayton, Vic 3800, Australia.,Monash University
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- D'Orazi, V (författare)
- INAF, Vicolo Osservatorio 5, I-35122 Padua, PD, Italy.,INAF - Osservatorio Astronomico di Padova
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- Kos, J. (författare)
- Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.,University of Ljubljana
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- Lewis, G. (författare)
- Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia.,University of Sydney
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- Lin, J. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.,Australian National University
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- Lind, Karin (författare)
- Uppsala University,Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany.,Max Planck Institute for Astronomy
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- Simpson, J. (författare)
- Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.,University of New South Wales
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- Stello, D. (författare)
- Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.,University of New South Wales
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- Munari, U. (författare)
- INAF Astron Observ Padova, I-36012 Asiago, VI, Italy.,INAF - Osservatorio Astronomico di Padova
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- Wittenmyer, R. A. (författare)
- Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia.,University of Southern Queensland
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(creator_code:org_t)
- 2020-06-30
- 2020
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 638
- Relaterad länk:
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https://doi.org/10.1...
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http://eprints.usq.e...
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Context. Binary stellar systems form a large fraction of the Galaxy's stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken into account when observations of stars are used to study the structure and evolution of the Galaxy. The advent of large-scale spectroscopic and photometric surveys allows us to obtain large samples of binaries that permit characterising their populations.Aims. We aim to obtain a large sample of double-lined spectroscopic binaries (SB2s) by analysis of spectra from the GALAH survey in combination with photometric and astrometric data. A combined analysis will provide stellar parameters of thousands of binary stars that can be combined to form statistical observables of a given population. We aim to produce a catalogue of well-characterised systems, which can in turn be compared to models of populations of binary stars, or to follow-up individual systems of interest.Methods. We obtained a list of candidate SB2 systems from a t-distributed stochastic neighbour embedding (t-SNE) classification and a cross-correlation analysis of GALAH spectra. To compute parameters of the primary and secondary star, we used a Bayesian approach that includes a parallax prior from Gaia DR2, spectra from GALAH, and apparent magnitudes from APASS, Gaia DR2, 2MASS, and WISE. We used a Markov chain Monte Carlo approach to sample the posterior distributions of the following model parameters for the two stars: T-eff[1,T-2], logg([1,2]), [Fe/H], V-r[1,V-2], v(mic[1,2]), v(broad[1,2]), R-[1,R-2], and E(B-V).Results. We present results for 12 760 binary stars detected as SB2s. We construct the statistical observables T-1/T-2, Delta V-r, and R-1/R-2, which demonstrate that our sample mostly consists of dwarfs, with a significant fraction of evolved stars and several dozen members of the giant branch. The majority of these binary stars is concentrated at the lower boundary of the Delta V-r distribution, and the R-1/R-2 ratio is mostly close to unity. The derived metallicity of our binary stars is statistically lower than that of single dwarf stars from the same magnitude-limited sample.Conclusions. Our sample of binary stars represents a large population of well-characterised double-lined spectroscopic binaries that are appropriate for statistical studies of the binary populations. The derived stellar properties and their distributions show trends that are expected for a population of close binary stars (a < 10 AU) detected through double lines in their spectra. Our detection technique allows us to probe binary systems with mass ratios 0.5 q <= 1.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- methods: data analysis
- techniques: radial velocities
- catalogs
- stars: statistics
- binaries: spectroscopic
- Binaries: spectroscopic
- Catalogs
- Methods: data analysis
- Stars: statistics
- Techniques: radial velocities
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- Av författaren/redakt...
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Traven, G.
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Feltzing, S.
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Merle, T.
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Van der Swaelmen ...
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Cotar, K.
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Church, R.
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visa fler...
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Zwitter, T.
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Ting, Y-S
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Sahlholdt, C.
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Asplund, M.
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Bland-Hawthorn, ...
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De Silva, G.
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Freeman, K.
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Martell, S.
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Sharma, S.
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Zucker, D.
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Buder, S.
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Casey, A.
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D'Orazi, V
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Kos, J.
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Lewis, G.
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Lin, J.
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Lind, Karin
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Simpson, J.
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Stello, D.
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Munari, U.
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Wittenmyer, R. A ...
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Uppsala universitet
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Lunds universitet