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Astron. Astrophys. 358, 1001-1006 (2000)

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Physical properties of the pulsating hydrogen-deficient star LSS 3184 (BX Cir) *

V.M. Woolf and C.S. Jeffery

Armagh Observatory, College Hill, Armagh, BT61 9DG, Ireland (vmw,csj@star.arm.ac.uk)

Received 16 February 2000 / Accepted 3 April 2000


We report new determinations of the radius and mass of the pulsating helium-rich, hydrogen-deficient star LSS 3184 (BX Cir) using measurements of radial velocity and angular radius throughout its pulsation cycle. Measurements of radial velocity, and thus changes in stellar radius ([FORMULA]), were made using Anglo-Australian Telescope echelle spectra. Hubble Space Telescope ultraviolet spectra and ground-based BV photometry were used to find temperatures and fluxes throughout the pulsation cycle. The temperatures and fluxes were used to find the angular radius of the star ([FORMULA]). The [FORMULA], [FORMULA], and [FORMULA] values thus found were used to calculate the mean stellar radius [FORMULA]. If we use the previously determined [FORMULA] for LSS 3184 and our radius estimate, we find its mass to be [FORMULA].

Key words: stars: chemically peculiar – stars: oscillations – stars: individual: LSS 3184 – stars: variables: general

* Based on observations obtained with the NASA/ESA Hubble Space Telescope, which is operated by STScI for the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Based on observations obtained at the Anglo-Australian Telescope, Coonabarabran, NSW, Australia

Send offprint requests to: V.M. Woolf

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© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000