The GALAH survey and symbiotic stars – I. Discovery and follow-up of 33 candidate accreting-only systems
Article
Article Title | The GALAH survey and symbiotic stars – I. Discovery and follow-up of 33 candidate accreting-only systems |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Munari, U. (Author), Traven, G. (Author), Masetti, N. (Author), Valisa, P. (Author), Righetti, G. -L. (Author), Hambsch, F. -J. (Author), Frigo, A. (Author), Cotar, K. (Author), De Silva, G. M. (Author), Freeman, K. C. (Author), Lewis, G. F. (Author), Martell, S. L. (Author), Sharma, S. (Author), Simpson, J. D. (Author), Ting, Y. -S. (Author), Wittenmyer, R. A. (Author) and Zucker, D. B. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 505 (4), pp. 6121-6154 |
Number of Pages | 34 |
Year | 2021 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stab1620 |
Web Address (URL) | https://academic.oup.com/mnras/article/505/4/6121/6294475 |
Abstract | We have identified a first group of 33 new candidates for symbiotic stars (SySt) of the accreting-only variety among the 600 255 stars so far observed by the GALactic Archaeology with HERMES (GALAH) high-resolution spectroscopic survey of the Southern hemisphere, more than doubling the number of those previously known. GALAH aims to high latitudes and this offers the possibility to sound the Galaxy for new SySt away from the usual plane and bulge hunting regions. In this paper, we focus on SySt of the M spectral type, showing an Hα emission with a peak in excess of 0.5 above the adjacent continuum level, and not affected by coherent radial pulsations. These constraints will be relaxed in future studies. The 33 new candidate SySt were subjected to an array of follow-up confirmatory observations [X-ray/ultraviolet (UV) observations with the Swift satellite, search for optical flickering, presence of a near-UV upturn in ground-based photometric and spectroscopic data, radial velocity changes suggestive of orbital motion, and variability of the emission-line profiles]. According to Gaia Early Data Release 3 (EDR3) parallaxes, the candidate new SySt are located at the tip of the giant branch, sharing the same distribution in M(Ks) of the well-established SySt. The accretion luminosities of the candidate new SySt are in the range 1-10 L⊙, corresponding to mass accretion rates of 0.1-1 × 10-9 M⊙ yr-1 for white dwarfs of 1 M⊙. The M giant of one of them presents a large lithium overabundance. |
Keywords | methods: data analysis; binaries: symbiotic; X-rays: binaries; galaxies: stellar content; accretion; accretion discs; Astrophysics -; Solar and Stellar Astrophysics |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | INAF - Astronomical Observatory of Padova, Italy |
Lund Observatory, Sweden | |
National Institute for Astrophysics, Italy | |
Asiago Novae and Symbiotic Stars Collaboration, Italy | |
University of Ljubljana, Slovenia | |
Macquarie University | |
Australian National University | |
University of Sydney | |
University of New South Wales | |
Princeton University, United States | |
Centre for Astrophysics | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6x86/the-galah-survey-and-symbiotic-stars-i-discovery-and-follow-up-of-33-candidate-accreting-only-systems
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