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12. Spectrographic observations of AI velorum

Published online by Cambridge University Press:  02 August 2017

Livio Gratton

Extract

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AI Velorum was discovered by E. Hertzsprung(1) in 1931 on plates taken at Johannes-burg; he found it to be an RR Lyrae variable with a period of od·1116, but later on F. Zagar(z) and A. van Hoof (3) showed that the light curve is very irregular. [G. Herbig(4) found that more or less the same kind of irregularities are present in the radial-velocity curve as well.

Type
Part IV Symposia
Information
Transactions of the International Astronomical Union , Volume 8 , September 1954 , pp. 819 - 822
Copyright
Copyright © Cambridge University Press 1954

References

(1) Hertzsprung, E.: B.A.N 6, 147, 1931.Google Scholar
(2) Zagar, F.: B.A.N. 8, 169, 1937.Google Scholar
(3) van Hoof, A.: B.A.N. 8, 172, 1937.Google Scholar
(4) Herbig, G.: Ap. J 110, 156, 1949.Google Scholar
(5) A more detailed account of these observations has been published in the Zeitschrift fü Astrophysik, 32, 69, 1953.Google Scholar
(6) An Atlas of Stellar Spectra, by Morgan, W. W., Keenan, P C. and Kellman, E.. Chicago 1943.Google Scholar
(7) Walraven's observations have been subsequently published in the B.A.N. 11, 421, 1952 Google Scholar
(8) Rosseland, S.: The Pulsation Theory of Variable Stars, p. 108. Oxford, 1949.Google Scholar