A photometric and spectrographic study of the variable star HD 94033

Details A photometric and spectrographic study of the variable star HD 94033 A photometric and spectrographic study of the variable star HD 94033

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..322m&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, April 1985, p. 322-327. NSF-supported research.

Astronomy and Astrophysics

Astronomy

24

Cepheid Variables, Dwarf Stars, Main Sequence Stars, Spectrograms, Stellar Spectrophotometry, Ubv Spectra, Color-Magnitude Diagram, K Lines, Light Curve, Radial Velocity, Stellar Evolution, Stellar Gravitation, Stellar Temperature

Scientific paper

New photometric (uvbyβ) and spectrographic observations of the dwarf Cepheid HD 94033 are described. The light amplitude, 0m.80 in V, and radial-velocity amplitude, 2K = 52 km s-1, are unusually large. The mean effective temperature and surface gravity are >Teff< = 7650K and >log g< = 4.14. The mean radial velocity, +268 km s-1, and low-metal abundance, [Fe/H] ≡ -2.4, indicate that the star is a very extreme Population II star. Standard evolutionary theory indicates the mass is 0.9 M_sun; and the age is 6.5×109 years. In many respects the star is similar to GD 428.

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