An atmosphere analysis of the Beta Cephei star Sigma SCO

Details An atmosphere analysis of the Beta Cephei star Sigma SCO An atmosphere analysis of the Beta Cephei star Sigma SCO

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189..137v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 137-146.

Astronomy and Astrophysics

Astrophysics

8

Cepheid Variables, Spectrum Analysis, Stellar Atmospheres, Stellar Temperature, Abundance, Radial Velocity, Spectral Line Width, Stellar Composition

Scientific paper

A phase-dependent atmosphere analysis of the β Cephei star σ Scorpii is presented. From high resolution coudé plates, effective temperatures and gravities are derived for a complete pulsation cycle of the star. Mean values are Teff = 26,150K±1070K, log g = 3.85±0.17 dex. The ranges in effective temperature and gravity throughout the cycle are ΔTeff= 4000K±2000K and Δlog geff = 0.7±0.4 dex. These ranges are most easily explained by the radial pulsation hypothesis. Derivation of the He, N and O abundances reveals that they are very nearly solar.

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