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The Secondary Star of the HgMn Binary Phi Her

M. M. Dworetsky·Rosemary Willatt
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Abstract

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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M. M. Dworetsky, Rosemary Willatt. 2006-12-15. The Secondary Star of the HgMn Binary Phi Her. https://arxiv.org/abs/astro-ph/0612432

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