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Mon. Not. R. Astron. Soc. 000, 000{000 (0000) Printed 15 June 1999 (MN L A T E X style le v1.4) The Pulsating Hydrogen{De cient Star LSS3184 (BX Cir)
 

Summary: Mon. Not. R. Astron. Soc. 000, 000{000 (0000) Printed 15 June 1999 (MN L A T E X style le v1.4)
The Pulsating Hydrogen{De cient Star LSS3184 (BX Cir)
D. Kilkenny 1 , C. Koen 1 , C.S. Je ery 2 , N.C. Hill 3 ? and D. O'Donoghue 1
1 South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa.
2 Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland.
3 School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, Scotland.
Accepted Received
ABSTRACT
We present extensive photometry and spectroscopy of the extremely Hydrogen{
de cient star, LSS 3184, recently discovered to be a rapid variable (period  0.1066d)
strikingly similar to V652 Her. Over 95 hours of photometry con rms the reported
variability, which is of rather low amplitude (V 0.03 mag), de nes the light curve
with greater precision and establishes a much more accurate ephemeris (period 
0.1065784d) to form a basis for detecting period change. Attention is drawn to the
usefulness of a period nding technique which ts harmonic components to the pho-
tometric observations. Spectroscopy shows a peak-to-peak variation in radial velocity
of about 30 km/s which, when combined with the photometric observations, con rms
the pulsational nature of the variability and strongly indicates that the pulsations are
radial in nature. A distance of 1.90.2 kpc is derived for LSS3184 implying a mean
radius of (1.350.15)R and a mean luminosity of (485135)L .

  

Source: Armagh Observatory

 

Collections: Physics