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Cepheid Masses: FUSE Observations of S Mus

Published online by Cambridge University Press:  12 April 2016

Nancy Remage Evans ,
Derck Massa ,
Alexander Fullerton ,
George Sonneborn  and
Rosina Iping
Nancy Remage Evans
Affiliation:
Smithsonian Astrophysical Observatory, 60 Garden St., Cambridge, MA 02138, USA
Derck Massa
Affiliation:
NASA’s GSFC, SGT, Inc., Code 681.0, Greenbelt, MD 20771, USA
Alexander Fullerton
Affiliation:
University of Victoria, Department of Physics and Astronomy, PO Box 3055, Station CSC, Victoria, BC, V8W 3P6, Canada
George Sonneborn
Affiliation:
NASA ’s GSFC, Code 681, Greenbelt, MD 20771, USA
Rosina Iping
Affiliation:
NASA ’s GSFC, Code 681, Greenbelt, MD 20771, USA

Abstract

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S Mus is the Cepheid with the hottest known companion. As a benefit, the large ultraviolet flux made it 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 Å because of the degeneracy between temperature and reddening. We have now obtained a FUSE spectrum in order to determine the temperature of the companion better. We have identified two regions which are temperature sensitive near 16 000 K, but are relatively unaffected by H2 absorption (940 Å, and the Ly β wings). By comparing S Mus B with other FUSE spectra, we have determined a temperature of 17 000 K. The resultant Cepheid mass is 6.0 ± 0.4 M⊙

Type
Part 6. Binary stars and pulsation
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 377 - 381
Copyright
Copyright © Astronomical Society of the Pacific 2004

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