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Mon. Not. R. Astron. Soc. 000, 000{000 (2002) Printed 10 December 2001 (MN L A T E X style le v1.4) Radial velocity study of the pulsating subdwarf B star and
 

Summary: Mon. Not. R. Astron. Soc. 000, 000{000 (2002) Printed 10 December 2001 (MN L A T E X style le v1.4)
Radial velocity study of the pulsating subdwarf B star and
possible Type Ia supernova progenitor KPD 1930+2752
Vincent M. Woolf, 1? C. Simon Je ery, 1 and Donald L. Pollacco, 2
1 Armagh Observatory, College Hill, Armagh BT61 9DG
2 Queens University Belfast, Belfast BT7 1NN
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
signi cant peaks in the power spectrum of the velocity curve above our detection
limit, about 4 km s 1 , at the frequencies where peaks due to pulsation were present
in the photometric data of previous researchers. We report an orbital velocity am-
plitude, 348:5  1 km s 1 , in agreement with that reported by previous investigators.
We nd an orbital period of P = 0:09509308  0:00000015 d based on our data and
the ephemeris of Maxted et al. (2000).
Key words: stars: individual: KPD 1930+2752, subdwarfs, binaries: spectroscopic,
stars: variables: other
1 INTRODUCTION
Subdwarf B (sdB) stars are a class of evolved hot stars with
physical properties that place them between the main se-

  

Source: Armagh Observatory

 

Collections: Physics