Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243l..33d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 243, Jan. 1, 1981, p. L33-L36.
Astronomy and Astrophysics
Astrophysics
6
Far Ultraviolet Radiation, Globular Clusters, Spectral Energy Distribution, Stellar Spectra, Ultraviolet Spectra, Elliptical Galaxies, Iue, Star Distribution, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
The far-UV energy distribution of two blue horizontal-branch (BHB) stars detected in the nucleus of M13 is presented. Their continua can be characterized by a model atmosphere of an effective temperature of 15,000 to 20,000 K and log g = 4.5, and it follows that V is in the range 15.9-16.7 for these stars. Comparison with integrated photometry by OAO 2 and by ANS indicates that, at wavelengths smaller than 1800 A, the integrated light is from BHB stars only, of which M13 contains about 200. For these far-UV wavelengths, the color of the BHB stars is also very similar to the integrated color of the elliptical galaxy M87.
Code Arthur D.
de Boer Klaas. S.
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