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Observation of mass loss in R CrB during the visual light minimum

Published online by Cambridge University Press:  12 April 2016

N. Kameswara Rao*
Affiliation:
Indian Institute of Astrophysics, Bangalore, India

Extract

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R CrB at minimum light shows three type of spectra: 1) an absorption line spectrum similar to that observed at maximum light; 2) a sharp emission line spectrum mainly due to singly ionised metals which is displaced to the blue by 3 to 10 kms-1 with reference to the absorption spectrum observed at maximum. This is supposed to be a kind of permanent feature which exists even at the time of light maximum; 3) a broad emission line spectrum consisting of mainly λ3889 of Hel, H and K lines of Call and the D lines of Nal. The widths of the broad emission features indicate expansion velocity of 200 kms-1, much greater than the escape velocity (Gaposchkin 1963, Rao 1975).

Type
Session VIII - Effects of Mass Loss on the Evolution of Binary Stars
Copyright
Copyright © Reidel 1981

References

Gaposchkin, CP.,: 1963, Astrophys. J. 138, 320 CrossRefGoogle Scholar
Forrest, W.J.,: Thesis – Univ. of Calif. Sandiago, 1974 Google Scholar
Rao, N.K.,: Bull. Astr. Soc. India, 3, 50, 1975 Google Scholar