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Astronomy & Astrophysics manuscript no. (will be inserted by hand later)

Summary: Astronomy & Astrophysics manuscript no.
(will be inserted by hand later)
Variability in the extreme helium star LSS 5121 ?
V. M. Woolf 1 , R. Aznar Cuadrado 1 , G. Pandey 2 , and C. S. Je ery 1
1 Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
email: vmw@star.arm.ac.uk, rea@star.arm.ac.uk, csj@star.arm.ac.uk
2 Department of Astronomy, University of Texas, Austin, TX 78712, USA
email: pandey@astro.as.utexas.edu
Abstract. We report a photometric and spectroscopic study of the hot extreme helium star LSS 5121. We
found photometric variability, but no period was evident in its periodogram. This is consistent with the previous
proposal, based on spectral line variations, that LSS 5121 is a non-radial pulsator similar to other hot extreme
helium stars.
Key words. stars: chemically peculiar { stars: oscillations { stars: variables { stars: individual: LSS 5121
1. Introduction
Extreme helium stars (EHes) are luminous blue stars with
spectra that indicate surfaces composed almost entirely of
helium, with traces of carbon and nitrogen and very little
(usually  1 per cent) hydrogen. Their temperatures fall
in the range 8000K  T  32 000K. The EHes are of in-
terest because, among other things, some of them pulsate


Source: Armagh Observatory


Collections: Physics