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KIC 10449976 : discovery of an extreme helium subdwarf in the Kepler field
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Jeffery, C. S., Ramsay, G., Naslim, N., Carrera, R., Greiss, Sandra, Barclay, T., Karjalainen, R., Brooks, A. and Hakala, P. (2013) KIC 10449976 : discovery of an extreme helium subdwarf in the Kepler field. Monthly Notices of the Royal Astronomical Society, Volume 429 (Number 4). pp. 3207-3213. doi:10.1093/mnras/sts579 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/sts579
Abstract
Optical spectroscopy of the blue star KIC 10449976 shows that it is an extremely helium-rich subdwarf with effective temperature Teff = 40 000 ± 300 K and surface gravity log g = 5.3 ± 0.1. Radial-velocity measurements over a 5 d time-scale show an upper variability limit of ≈50 ± 20 km s−1. Kepler photometry of KIC 10449976 in both long and short cadence modes shows evidence for a periodic modulation on a time-scale of ≈3.9 d. We have examined the possibility that this modulation is not astrophysical but conclude that it is most likely real. We discuss whether the modulation could be caused by a low-mass companion, by stellar pulsations or by spots. The identification of any one of these as cause has important consequences for understanding the origin of helium-rich subdwarfs.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
Publisher: | Oxford University Press | ||||||||||
ISSN: | 0035-8711 | ||||||||||
Official Date: | March 2013 | ||||||||||
Dates: |
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Volume: | Volume 429 | ||||||||||
Number: | Number 4 | ||||||||||
Page Range: | pp. 3207-3213 | ||||||||||
DOI: | 10.1093/mnras/sts579 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published |
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