On the mass of the Cepheid X Cygni

Details On the mass of the Cepheid X Cygni On the mass of the Cepheid X Cygni

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..914d&link_type=abstract

Astrophysical Journal, Part 1, vol. 246, June 15, 1981, p. 914-918. Research supported by the Research Corp. and U.S. Departmen

Astronomy and Astrophysics

Astrophysics

12

Cepheid Variables, Light Curve, Stellar Models, Hydrodynamics, Pulsed Radiation, Stellar Evolution, Stellar Luminosity, Stellar Mass, Stellar Temperature

Scientific paper

Using a new non-Lagrangian hydrodynamic radiation transport code, models of the Cepheid X Cygni have been calculated and compared with new observations. Adopting an effective temperature of 5300 K, the luminosity was varied for stellar masses of 6, 8, and 9 solar masses in order to obtain a period of 16.4d. The results indicate that in order to find reasonable agreement between the light curves as calculated and observed, the mass used in the models must be nearly the evolutionary mass, not some 60% less as found in earlier work for Cepheids with periods from 7d to 10d. In addition, the new observations support the physical reality of the so-called 'artificial viscosity dip'.

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