Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186p..15w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 186, Feb. 1979, p. 15P-18P.
Astronomy and Astrophysics
Astronomy
2
Far Ultraviolet Radiation, Radiation Sources, Ultraviolet Astronomy, Visual Observation, B Stars, Electrophotometers, Stellar Spectrophotometry, Ubv Spectra
Scientific paper
Results are reported for visual spectroscopy (3500 - 5000 A) and UBV, BVRI, and Stromgren photoelectric photometry of the eighth-magnitude star HD 192273, which has been suggested as a UV source at 500 A. It is shown that HD 192273 cannot be degenerate, but more likely appears to be a B-type horizontal-branch subdwarf or a slightly reddened main-sequence star. The data indicate atmospheric parameters in the neighborhood of an effective temperature of 27,000 K and log g 4.8, as well as a near-normal helium abundance. It is suggested that such a model could explain the UV observations if the intervening hydrogen density is very low (hydrogen column density less than 5 x 10 to the 17th power per sq cm).
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