Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1973
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..22..133s&link_type=abstract
Astrophysics and Space Science, Volume 22, Issue 1, pp.133-140
Astronomy and Astrophysics
Astrophysics
9
Scientific paper
Strong absorption satellite lines of Ca I λ 6572 were found on spectrograms taken on three successive days just after the fourth contact of the 1971 72 eclipse of Zeta Aurigae. The radial velocities of the satellite lines are -88 km s-1, -74 km s-1, and -180 km-1, respectively, relative to the K-type primary star (K4 Ib). These absorptions should be due to a circumstellar cloud in which the column density of neutral calcium atoms is 1×1017 cm-2 and the turbulent velocities come to 20 50 km s-1. It is suggested that the cloud may be formed by the rocket-effect of the Lyman quanta of the B-type component (B6 V). We estimate the density in the cloud to be 2×1011 atoms cm-3 fors=10R K and 2×1010 atoms cm-3 fors=102 R K, wheres denotes the distance of the cloud from the K star andR K the K star's radius. The mass loss rate of the K-type component is also estimated to be about 10-7 M &sun; yr-1, assuming that the expansion of the K star occurs isotropically.
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