Confirming the binary nature of PG 1544+488 with FUSE

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Helium-rich subdwarf B (He-sdB) stars form a very small fraction of the population of hot subdwarf stars in our Galaxy. We present our serendipitous discovery that the prototype -- PG 1544+488 -- is a binary containing two low-mass helium-rich hot subdwarfs. The discovery was confirmed by a re-analysis of archival FUSE observations of PG 1544+488. We also discuss the contradiction between FUSE and optical measurements of He-sdB surface gravities. The implications of these observations for the evolutionary status of He-sdB stars are also explored.

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