Other
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apjs...71..595p&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 71, Nov. 1989, p. 595-621. Research supported by the U.S. Navy an
Other
48
Eclipsing Binary Stars, Radial Velocity, Stellar Motions, Stellar Spectrophotometry, Balmer Series, Line Spectra, Photosphere, Stellar Atmospheres, Stellar Spectra, Stellar Temperature
Scientific paper
Radial velocities derived from photometric analysis of the Na D lines for the cooler components of the 12 Algol systems are discussed. The number of velocities per system at the D lines ranges from 6 to 63, and in each case, the velocities are well represented by circular motion. For a 5-day period, the spectra of the primaries in RY Aqr, TW Dra, TW And, and RS Vul appear to be completely photospheric, while the other eight systems, Rx Gem, Ry Gem, AD Her, TT Hya, Au Mon, RW Per, RY Per, and XY Pup, show double H-alpha emission and other evidence of nonphotospheric material in the hotter spectra. For most of these systems of longer period, the velocities are quite well represented by pseudoelliptical motion, with minimum velocities and maximum departures from circular motion near phase 0.4, measured from primary minimum. Provisional masses are given for the stars based on the available spectroscopic and photometric evidence, much of it of low weight. The companions of the primaries with A-type spectra have masses of 0.75 solar mass or less, and temperatures or types in the early K range as observed in RY Aqr. All the secondaries are larger than main-sequence stars of the corresponding types.
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