Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...418..275a&link_type=abstract
Astronomy and Astrophysics, v.418, p.275-281 (2004)
Astronomy and Astrophysics
Astrophysics
18
Stars: Chemically Peculiar, Stars: Early-Type, Stars: Subdwarfs, Stars: Individual: Pg 1544+488
Scientific paper
Helium-rich subdwarf B (He-sdB) stars form a very small fraction of the population of hot subdwarf stars in our Galaxy. They have been found both in the field of our Galaxy as well as in globular clusters. The evolution of these rare stars has recently been the subject of much debate involving both binary and single star evolution models. We report our serendipitous discovery that the prototype - PG 1544+488 - is a binary containing two low-mass helium-rich hot subdwarfs. This discovery challenges existing evolutionary models for He-sdB stars and suggests that they may be formed through close binary evolution and following the ejection of a common envelope.
Based on observations made with the William Herschel and Isaac Newton Telescopes operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias and with the NASA-CNES-CSA Far Ultraviolet Spectroscopic Explorer.
Ahmad Ayesha
Fullerton Alex W.
Jeffery Simon C.
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