A plethora of new R Coronae Borealis stars discovered from a dedicated spectroscopic follow-up survey
| Autor: | Łukasz Wyrzykowski, Andrzej Udalski, Michael S. Bessell, P. Wils, Douglas L. Welch, Peter R. Wood, Przemek Mróz, Patrick Tisserand, Geoffrey C. Clayton, Devika Kamath |
|---|---|
| Přispěvatelé: | Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Australian National University (ANU), Louisiana State University (LSU), McMaster University [Hamilton, Ontario], Macquarie University, Astronomical Observatory [Warsaw], Faculty of Physics [Warsaw] (FUW), University of Warsaw (UW)-University of Warsaw (UW) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Long lasting
Milky Way FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics stars: evolution 010303 astronomy & astrophysics Follow up survey Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics Astronomy and Astrophysics supergiants [PHYS.ASTR.SR]Physics [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR] stars: chemically peculiar Stars stars: carbon Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Physics::Space Physics Astrophysics::Earth and Planetary Astrophysics Supergiant methods: observational |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 635, pp.A14. ⟨10.1051/0004-6361/201834410⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201834410⟩ |
| Popis: | It is increasingly suspected that the rare R Coronae Borealis (RCB) stars - hydrogen-deficient and carbon-rich supergiant stars - are the products of mergers of CO/He white-dwarf binary systems in the intermediate mass regime ($0.615000$ K). Forty of these belong to the Milky Way and five are located in the Magellanic Clouds. We also confirmed that the long lasting candidate KDM 5651 is indeed a new Magellanic RCB star, increasing the total number of Magellanic Cloud RCB stars to 30. We have increased by $\sim$50\% the total number of RCB stars known, now reaching 147. We also include a list of 14 strong RCB candidates, most certainly observed during a dust obscuration phase. From the detection efficiency and success rate so far, we estimate that there should be no more than 500 RCB stars/HdC stars in the Milky Way. Comment: 34 pages, 20 figures |
| Databáze: | OpenAIRE |
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