SIMBAD references

1998A&A...329.1019D - Astronomy and Astrophysics, volume 329, 1019-1027 (1998/1-3)

Spectral analysis of the extreme helium star LSS 3184.

DRILLING J.S., JEFFERY C.S. and HEBER U.

Abstract (from CDS):

LSS 3184 is a hydrogen-deficient, early B-type giant, recently found to pulsate with a period of 2.5 hours. Its photospheric parameters have been derived from optical high-resolution spectra by the method of fine analysis. The principal results are Teff=23300 K, logg=3.35, nH/nHe≲0.00015, nC/nHe=0.003, nN/nHe=0.0005, and nO/nHe=0.0003. Hydrogen is extremely deficient. The effective temperature is consistent with broad-band visual and ultraviolet spectrophotometry and an extinction EB–V∼0.27. Its previous evolution is reflected in the chemistry of the atmosphere, which contains enriched nitrogen from CNO-cycle hydrogen burning, and carbon from 3α helium burning. Thus LSS3184 is a true extreme helium star with a composition similar to BD-9 4395. With Teff, logg, and pulsation properties very similar to the C-poor and N-rich helium star V652 Her, evolutionary mechanisms which can result in very different surface compositions for the two stars must be examined.

Abstract Copyright:

Journal keyword(s): stars: helium - individual: LSS 3184 - abundances - chemically peculiar - emission line: Be

Simbad objects: 14

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