HW Vir's Companion: a M-type Dwarf, or maybe a giant rotating spherical Mirror?

Details HW Vir's Companion: a M-type Dwarf, or maybe a giant rotating spherical Mirror? HW Vir's Companion: a M-type Dwarf, or maybe a giant rotating spherical Mirror?

2008-09-18

arxiv.org/abs/0809.3260v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, Proceedings of the 3rd Meeting on Hot Subdwarf Stars and Related Objects, U. Heber, S. Jeffery, Napiwotzki

Scientific paper

From optical high-resolution spectra the nature of the unseen companion of HW Vir is determined without detection of any spectral features originating from the secondary itself. Using radial velocity measurements from the primary hot subdwarf B star and from weak additional absorption lines detected close to the secondary eclipse, probably caused by reflected light off the surface of the secondary, the mass and radius of the companion is determined. The values are consistent with those of a M type main sequence star.

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