The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission. Issue 2 (21st May 2019)
- Record Type:
- Journal Article
- Title:
- The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission. Issue 2 (21st May 2019)
- Main Title:
- The GALAH survey: unresolved triple Sun-like stars discovered by the Gaia mission
- Authors:
- Čotar, Klemen
Zwitter, Tomaž
Traven, Gregor
Kos, Janez
Asplund, Martin
Bland-Hawthorn, Joss
Buder, Sven
D'Orazi, Valentina
De Silva, Gayandhi M
Lin, Jane
Martell, Sarah L
Sharma, Sanjib
Simpson, Jeffrey D
Zucker, Daniel B
Horner, Jonathan
Lewis, Geraint F
Nordlander, Thomas
Ting, Yuan-Sen
Wittenmyer, Rob A
GALAH collaboration, - Abstract:
- Abstract: 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.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 487:Issue 2(2019)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 487:Issue 2(2019)
- Issue Display:
- Volume 487, Issue 2 (2019)
- Year:
- 2019
- Volume:
- 487
- Issue:
- 2
- Issue Sort Value:
- 2019-0487-0002-0000
- Page Start:
- 2474
- Page End:
- 2490
- Publication Date:
- 2019-05-21
- Subjects:
- methods: data analysis -- binaries: general -- stars: solar-type -- Galaxy: stellar content
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stz1397 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 11987.xml