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Mon. Not. R. Astron. Soc. 000, 000{000 (2001) Printed 3 September 2001 (MN L A T E X style le v1.4) Radial velocity variations of the pulsating subdwarf B star
 

Summary: Mon. Not. R. Astron. Soc. 000, 000{000 (2001) Printed 3 September 2001 (MN L A T E X style le v1.4)
Radial velocity variations of the pulsating subdwarf B star
PG 1605+072 ?
Vincent M. Woolf, 1y C. Simon Je ery, 1 and Donald L. Pollacco, 2;3
1 Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
2 Isaac Newton Group, La Palma, Apartado de correos 321, E-38700 Santa Cruz de la Palma, Tenerife, Spain
3 Queens University Belfast, Belfast BT7 1NN, Northern Ireland
ABSTRACT
We present an analysis of high-speed spectroscopy of the pulsating subdwarf B star
PG 1605+072. Periodic radial motions are detected at frequencies similar to those
reported for photometric variations in the star, with amplitudes of up to 6 km s 1 .
Di erences between relative strengths for given frequency peaks for our velocity data
and previously measured photometry are probably a result of shifting of power between
modes over time. Small di erences in the detected frequencies may also indicate mode-
shifting. We report the detection of line-shape variations using the moments of the
cross correlation function pro les. It may be possible to use the moments to identify
the star's pulsation modes.
Key words: stars: individual: PG 1605+072, stars: subdwarfs, stars: oscillations,
stars: variables: other
1 INTRODUCTION

  

Source: Armagh Observatory

 

Collections: Physics