The GALAH survey: multiple stars and our Galaxy: I. A comprehensive method for deriving properties of FGK binary stars?

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Sökning: onr:"swepub:oai:DiVA.org:uu-419951" > The GALAH survey :

1 av 1
Föregående post
Nästa post
Till träfflistan

The GALAH survey : multiple stars and our Galaxy: I. A comprehensive method for deriving properties of FGK binary stars?

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

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

Merle, T. (författare): Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.,Université Libre de Bruxelles (ULB)

visa fler...

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)

Cotar, K. (författare): Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.,University of Ljubljana

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

Zwitter, T. (författare): Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.,University of Ljubljana

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)

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

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)

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

De Silva, G. (författare): Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia.,Macquarie University, Sydney

Freeman, K. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.,Australian National University

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.

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)

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

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.

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

D'Orazi, V (författare): INAF, Vicolo Osservatorio 5, I-35122 Padua, PD, Italy.,INAF - Osservatorio Astronomico di Padova

Kos, J. (författare): Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.,University of Ljubljana

Lewis, G. (författare): Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia.,University of Sydney

Lin, J. (författare): Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.,Australian National University

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

Simpson, J. (författare): Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.,University of New South Wales

Stello, D. (författare): Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia.,University of New South Wales

Munari, U. (författare): INAF Astron Observ Padova, I-36012 Asiago, VI, Italy.,INAF - Osservatorio Astronomico di Padova

Wittenmyer, R. A. (författare): Univ Southern Queensland, Ctr Astrophys, West St, Toowoomba, Qld 4350, Australia.,University of Southern Queensland

visa färre...

(creator_code:org_t)

2020-06-30
2020
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 638

Relaterad länk:: https://doi.org/10.1...; visa fler...; http://eprints.usq.e...; http://dx.doi.org/10... (free); https://urn.kb.se/re...; https://doi.org/10.1...; https://lup.lub.lu.s...; visa färre...

Tidskriftsartikel (refereegranskat)

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

Publikations- och innehållstyp

ref (ämneskategori)
art (ämneskategori)

Hitta via bibliotek

Astronomy and Astrophysics (Sök värdpublikationen i LIBRIS)

Till lärosätets databas

1 av 1
Föregående post
Nästa post
Till träfflistan

Hitta mer i SwePub

Av författaren/redakt...: Traven, G.; Feltzing, S.; Merle, T.; Van der Swaelmen ...; Cotar, K.; Church, R.; visa fler...; Zwitter, T.; Ting, Y-S; Sahlholdt, C.; Asplund, M.; Bland-Hawthorn, ...; De Silva, G.; Freeman, K.; Martell, S.; Sharma, S.; Zucker, D.; Buder, S.; Casey, A.; D'Orazi, V; Kos, J.; Lewis, G.; Lin, J.; Lind, Karin; Simpson, J.; Stello, D.; Munari, U.; Wittenmyer, R. A ...; visa färre...

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Fysik; och Astronomi astrof ...

Artiklar i publikationen: Astronomy and As ...

Av lärosätet: Uppsala universitet; Lunds universitet

Sök utanför SwePub

Sök vidare i:: Google; 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.

LIBRIS.kb.se