Cepheid Masses: FUSE Observations of S Mus

Details Cepheid Masses: FUSE Observations of S Mus Cepheid Masses: FUSE Observations of S Mus

2006-07-21

arxiv.org/abs/astro-ph/0607489v1

Astrophys.J.647:1387-1392,2006

Astronomy and Astrophysics

Astrophysics

accepted to ApJ

Scientific paper

10.1086/505519

S Mus is the Cepheid with the hottest known companion. The large ultraviolet flux means that it is the only Cepheid companion for which the velocity amplitude could be measured with the echelle mode of the HST GHRS. Unfortunately, the high temperature is difficult to constrain at wavelengths longer than 1200 \AA because of the degeneracy between temperature and reddening. We have obtained a FUSE spectrum in order to improve the determination of the temperature of the companion. Two regions which are temperature sensitive near 16,000 K but relatively unaffected by H$_2$ absorption (940 \AA, and the Ly $\beta$ wings) have been identified. By comparing FUSE spectra of S Mus B with spectra of standard stars, we have determined a temperature of 17,000 $\pm$ 500 K. The resultant Cepheid mass is 6.0 $\pm$ 0.4 M$_\odot$. This mass is consistent with main sequence evolutionary tracks with a moderate amount of convective overshoot.

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