Nonlinear Models of the Bump Cepheid HV 905 and the Large Magellanic Cloud Distance Modulus

Details Nonlinear Models of the Bump Cepheid HV 905 and the Large Magellanic Cloud Distance Modulus Nonlinear Models of the Bump Cepheid HV 905 and the Large Magellanic Cloud Distance Modulus

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485l..25w&link_type=abstract

Astrophysical Journal Letters v.485, p.L25

Astronomy and Astrophysics

Astronomy

33

Stars: Oscillations, Stars: Cepheids, Galaxies: Magellanic Clouds

Scientific paper

Nonlinear pulsation models have been used to simulate the light curve of the LMC bump Cepheid HV 905. In order to reproduce the light curve accurately, tight constraints on the input parameters M, L, and Teff are required. The results, combined with accurate existing V and I photometry, yield an LMC distance modulus of 18.51 +/- 0.05, and they show that the luminosity of HV 905 is much higher than expected from the mass-luminosity relation of stellar evolution theory. If we assume that the pulsation models are accurate, this suggests that there is a larger amount of convective core overshoot during the main-sequence evolution of stars with M ~ 5 Msolar than is usually assumed.

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