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Orbital characteristics of the subdwarf-B and F V star binary EC 20117-4014(=V4640 SGR)

Abstract:

Among the competing evolution theories for subdwarf-B (sdB) stars is the binary evolution scenario. EC 20117-4014 (=V4640 Sgr) is a spectroscopic binary system consisting of a pulsating sdB star and a late F main-sequence companion (O’Donoghue et al. 1997), however the period and the orbit semi-major axes have not been precisely determined. This paper presents orbital characteristics of the EC 20117-4014 binary system using 20 years of photometric data. Periodic Observed minus Calculated (O-C...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Publisher's version

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Publisher copy:
10.3847/1538-4357/aab9bf

Authors


Oswalt, TD More by this author
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Institution:
University of Oxford
Division:
MPLS Division
Department:
Physics; Astrophysics
Kilkenny, D More by this author
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Grant:
AST-108845, AST-1358787, and PHY-1358879 to TDO
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Grant:
panel for the Allocation of Telescope Time (United Kingdom), the award of travel and subsistence expenses to AELG
National Research Foundation of South Africa More from this funder
Publisher:
American Astronomical Society Publisher's website
Journal:
Astrophysical Journal Journal website
Volume:
859
Issue:
2
Pages:
Article: 145
Publication date:
2018-06-01
Acceptance date:
2018-03-24
DOI:
EISSN:
1538-4357
ISSN:
0004-637X
Pubs id:
pubs:831714
URN:
uri:f49c1638-05b2-446b-b720-9093844d1ef3
UUID:
uuid:f49c1638-05b2-446b-b720-9093844d1ef3
Local pid:
pubs:831714

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