Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986acaps...6..154t&link_type=abstract
(Acta Astrophysica Sinica, vol. 6, 1986, p. 154-159) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 10, Dec. 1986, p.
Astronomy and Astrophysics
Astrophysics
B Stars, Binary Stars, Stellar Rotation, Stellar Spectrophotometry, Absorption Spectra, Angular Velocity, Line Spectra
Scientific paper
The HeI 5857 A line observed with a Reticon at the coude focus of the 2.1-meter reflector of McDonald Observatory was used to measure the Vsini value for 18 binaries of spectral type B by fitting the observed profile to that of a standard star convolved with Gray's rotational broadening function. Results for the two components of Xi2 CrB and the primary of 25 Ser are less than half the catalog values. The profiles of U CrB and Nu Sco have a narrow central absorption and very wide wings, and the measured value of 75 km/s for Nu Sco, based on the central absorption, is much smaller than the catalogue value of 210 km/s. THe profile of AR Cas was found to change with phase. The values agreed with Slettebak's new system better than with his old system.
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