The dynamical mass of S MUSCAE

Details The dynamical mass of S MUSCAE The dynamical mass of S MUSCAE

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..353b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, Jan. 1990, p. 353-372.

Astronomy and Astrophysics

Astronomy

14

Cepheus Constellation, Dynamic Characteristics, Main Sequence Stars, Stellar Evolution, Stellar Mass, Ultraviolet Astronomy, Companion Stars, Iue, Radial Velocity, Stellar Interiors

Scientific paper

The amplitudes and phase relations of pulsational velocities of the Cepheid S Muscae, measured for lines originating at different atmospheric depths, are investigated. A mass M(A) = 4.4 + or - 0.5 solar masses is found for the Cepheid; however, the Cepheid is the evolved star and should have a mass larger than that of its companion. If the measured velocity differences are too low by 2.5 km/s on the average, then the mass ratio M(B)/M(A) may be decreased to 0.94, giving an estimated upper limit to the Cepheid mass of 6.1 solar masses, consistent with the Cepheid being the more evolved star. Considering all the uncertainties, it is concluded that the mass of the Cepheid is between 4.6 and 6.1 solar masses.

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