Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6471j&link_type=abstract
HST Proposal ID #6471
Physics
Hst Proposal Id #6471 Hot Stars
Scientific paper
LSS 3184 is an extreme helium star, that is, a `post-AGB' starwith negligible hydrogen and significant overabundances ofcarbon, nitrogen and alpha-capture products in its atmosphere.In confirmation of a theoretical prediction, LSS 3184 wasrecently discovered to vary with a period of 2.5 hours,identical to that for the pulsating helium star V652 Her.Ground-based observations to verify the dicovery, define thevisual (BVR) light curve and to establish the radial velocitycurve were undertaken during May 1995. Ultravioletobservations are required to measure the bolometric lightcurve and the variation in Teff throughout the pulsationcycle. These will allow the stellar radius to be measuredindependent of distance. Only HST can provide the photometricprecision necessary to make a direct test of stellar pulsationtheory and an indirect test of modern opacities. Theseobservations will also allow the first direct massdetermination for a `bona fide' extreme helium star, vital fordetermining their evolutionary status.
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