Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..752l&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 752-755.
Astronomy and Astrophysics
Astrophysics
24
Binary Stars, Emission Spectra, M Stars, Main Sequence Stars, Radial Velocity, Stellar Spectrophotometry, White Dwarf Stars, Companion Stars, H Alpha Line, Star Clusters, Stellar Envelopes, Stellar Evolution, Stellar Mass
Scientific paper
Emission lines in the spectrum of the DA white dwarf star C1 indicated the existence of an unresolved companion, whose spectral type was determined to be approximately dM2. A radial-velocity curve for each star was obtained by observing the H-alpha emission line of its companion, and by considering the average difference between measured and standard velocities for each star. The proper motion of C1 is similar in magnitude to that of the Ursa Major cluster but in the wrong direction. A lower limit for the mass of the white dwarf component is computed by assuming that the M dwarf is a normal main sequence star. The system shows similarities to post-common-envelope binaries.
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