Other
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187...17w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 17-21.
Other
18
Binary Stars, Hot Stars, Stellar Spectrophotometry, Ubv Spectra, White Dwarf Stars, Far Ultraviolet Radiation, Spectrum Analysis, Stellar Motions, Stellar Spectra, Ultraviolet Spectra
Scientific paper
Spectroscopic observations over the wavelength range from 3700 to 5500 A and UBV photometry of the proposed hot white dwarf HD 149499B are reported. The spectrum is found to be nearly continuous and to lack hydrogen Balmer lines. An absolute visual magnitude of 9.5 is determined, along with a heliocentric radial velocity of about 31 km/s and space velocities of (U, V, W) = (-21, +30, -12) km/s. The results are taken to confirm the identification of HD 149499B as a hot white dwarf. It is concluded that: (1) if this star is in the same temperature range as other known hot hydrogen-rich degenerates (viz., HZ 43 and F 24), the absence of Balmer lines implies that the star is hydrogen-deficient, and (2) if the 4686-A line of He II is present, HD 149499B is likely to be a helium-rich DO star like HZ 21.
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