The Secondary Star of the HgMn Binary Phi Her

Details The Secondary Star of the HgMn Binary Phi Her The Secondary Star of the HgMn Binary Phi Her

2006-12-15

arxiv.org/abs/astro-ph/0612432v1

Astronomy and Astrophysics

Astrophysics

Four pages. Four figures. Presented to the Working Group on Ap Stars at IAU General Assembly in Prague, August 2006

Scientific paper

The binary nature of the bright (V = 4.2 mag) Mercury-Manganese star Phi Her has been known since 1976 and it was considered a low-amplitude single-lined SB. In a recent study we found evidence for lines of the secondary star. Other recent results from interferometry provide a good measure of the light ratio. It is very plausible that the secondary is a late main-sequence A star. We find the rotational velocity of the secondary to be ~42 +/- 5 km/s.

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