Summary: A&A manuscript no.
(will be inserted by hand later)
Your thesaurus codes are:
06 (08.01.1; 08.03.2; 08.06.3; 08.09.2 LSS4357, LS II+33 ffi 5, LSS 99)
Spectral analysis of the lowgravity extreme helium stars
LSS 4357, LS II+33 ffi 5 and LSS 99 ?
C.S. Jeffery 1 , Peter J. Hamill 1 , Paul M. Harrison 1 , and Sandra V. Jeffers 1
Armagh Observatory, College Hill, Armagh BT61 9DG
Received 19 May 1998; accepted 25 September 1998
Abstract. We have carried out quantitative analyses of three
very low surface gravity extreme helium stars with very similar
spectra. Their effective temperatures of ¸ 16 000K fill a gap in
a nearly continuous sequence of extreme helium stars all having
similar luminositytomass ratios, but extending from effective
temperatures around 12 000 K to more than 20 000 K. Because
of the low surface gravities and extremely rich line spectra,