Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..198a&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 91, Apr.-May 1979, p. 198-201.
Astronomy and Astrophysics
Astronomy
2
O Stars, Spectral Energy Distribution, Stellar Spectrophotometry, Supergiant Stars, Abundance, Atmospheric Models, Brightness Temperature, Stellar Atmospheres, Stellar Models
Scientific paper
The spectrophotometry of the bright OBC star Kappa Cassiopeiae and of the normal supergiant HD 188209 is examined. The energy distributions of the stars were measured in the spectral region 3300-7100 with the HCO Scanner on the no. 1 92-cm telescope at Kitt Peak. For Kappa Cas, the Crawford (1978) method based on Stromgren color indices yields E(B - V) = 0.40 mag and the Q method using Johnson color indices yields 0.44 mag; for Hd 188209 the two methods yield 0.17 mag and 0.22 mag, respectively. Upon comparing the dereddened fluxes with the predictions of Kurucz's (1979) full-line-blanketed, plane-parallel model atmospheres with solar abundances to obtain the brightness temperatures found, the best fit for Kappa Cas with E(B - V) = 0.40 mag occurs for T(eff) = 30,000 K, log g = 3.5. The best fit for HD 188209 with E(B - V) = 0.17 mag is T(eff) 30,000 K, log g = 3.5, where the star is brighter than the model longward of 6400 A.
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