Radial velocity study of the pulsating subdwarf B star and possible Type Ia supernova progenitor KPD 1930+2752 |
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| Authors: | Vincent M Woolf C Simon Jeffery Donald L Pollacco |
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| Institution: | Armagh Observatory, College Hill, Armagh BT61 9DG; Queens University Belfast, Belfast BT7 1NN |
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| Abstract: | We report the results of a high-time-resolution radial velocity study of the subdwarf B star and possible Type Ia supernova progenitor KPD 1930+2752. There were no significant peaks in the power spectrum of the velocity curve above our detection limit, about 4 km s?1, at the frequencies where peaks arising from pulsation were present in the photometric data of previous researchers. We report an orbital velocity amplitude, 348.5±1 km s-1 , in agreement with that reported by previous investigators. We find an orbital period of P =0.095 093 08±0.000 000 15 d based on our data and the ephemeris of Maxted et al. |
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| Keywords: | binaries: spectroscopic stars: individual: KPD 1930+2752 subdwarfs stars: variables: other |
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