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The GALAH survey an...
The GALAH survey and symbiotic stars - I. Discovery and follow-up of 33 candidate accreting-only systems
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- Munari, U. (author)
- INAF Palermo Astronomical Observatory
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- Traven, G. (author)
- 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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- Masetti, N. (author)
- INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Bologna,Andrés Bello National University
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- Valisa, P. (author)
- University of Padova
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- Righetti, G. L. (author)
- University of Padova
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- Hambsch, F. J. (author)
- University of Padova
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- Frigo, A. (author)
- University of Padova
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- Čotar, K. (author)
- University of Ljubljana
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- De Silva, G. M. (author)
- Macquarie University, Sydney
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- Freeman, K. C. (author)
- Australian National University
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- Lewis, G. F. (author)
- University of Sydney
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- Martell, S. L. (author)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of New South Wales
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- Sharma, S. (author)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney
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- Simpson, J. D. (author)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of New South Wales
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- Ting, Y. S. (author)
- Princeton University
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- Wittenmyer, R. A. (author)
- University of Southern Queensland
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- Zucker, D. B. (author)
- Macquarie University, Sydney,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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(creator_code:org_t)
- 2021-06-07
- 2021
- English 34 s.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 505:4, s. 6121-6154
- Related links:
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http://dx.doi.org/10...
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http://eprints.usq.e...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- accretion, accretion discs
- binaries: symbiotic
- galaxies: stellar content
- methods: data analysis
- X-rays: binaries
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Munari, U.
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Traven, G.
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Masetti, N.
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Valisa, P.
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Righetti, G. L.
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Hambsch, F. J.
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Frigo, A.
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Čotar, K.
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De Silva, G. M.
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Freeman, K. C.
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Lewis, G. F.
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Martell, S. L.
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Sharma, S.
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Simpson, J. D.
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Ting, Y. S.
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Wittenmyer, R. A ...
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Zucker, D. B.
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