Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..207r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 207-218.
Astronomy and Astrophysics
Astrophysics
8
Atmospheric Models, Cassiopeia Constellation, Open Clusters, Stellar Atmospheres, Stellar Evolution, Chemical Composition, Energy Distribution, Stellar Gravitation, Stellar Structure
Scientific paper
By constructing non-LTE spherical model atmospheres, we have calculated a theoretical distribution of the emergent radiation that best matches the observed distribution of the supergiant Phi Cas, and so derived its effective temperature, surface gravity, and radius. Since Phi Cas is very likely a member of the open cluster NGC 457, we made extinction corrections using the extinction determined for this cluster by Rosenzweig and Morrison (1986). Moreover, the theoretical atmospheres used for the comparison are line-blanketed models in hydrostatic and radiative equilibrium. Several tests have demonstrated that the models are reliable. The comparison of the observed UV and visible energy distributions and the H-delta, Ca II K, and Mg II h and k line profiles with the theoretical results indicates that the best model for Phi Cas has T(eff) = 7200 +/- 100 K, log g = 0.4 +/- 0.1, and R* = 263 +/- 34 R(solar). These results imply a mass of 6.3 +/- 3.6 solar masses, which is lower than but within the error of the mass of the main-sequence turnoff point in NGC 457.
Anderson Lawrence
Rosenzweig Patricia
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