Radial velocity measurements of the spectra of Zeta Aurigae outside eclipses |
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| Authors: | Ralf Koppmann |
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| Institution: | (1) Sternwarte der Universität Bonn, Germany |
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| Abstract: | Radial velocities of both components of Zeta Aurigae have been measured on 39 grating spectra obtained in the interval February 1970-November 1981.The evaluation of the orbital elements of the primary component confirmed, the elements observed so far. The velocity variation of the secondary component has been determined according to the method described by Popper (1961) yieldingK
B=30.57±5.97 (m.e.) km s–1. The masses of the components were found to beM
K sin3
i=6.4±1.7 andM
B sin3
i=4.5±0.9 solar masses. With the elements obtained a radial velocity curve of the B-star has been calculated. Comparison of the radial velocities derived from the hydrogen lines of the B-star with the calculated radial velocity curve shows systematic deviations which indicate that these lines originate partly in an expanding circumstellar envelope of the system. The main constituent of the envelope must be neutral hydrogen of high density. Variations of the radial velocities indicate density variations due to condensations inside this envelope. |
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