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24. The Spectrum of WY Velorum

Published online by Cambridge University Press:  02 August 2017

Jorge Sahade

Extract

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WY Velorum(1) is a southern peculiar star discovered at Harvard(2) as being variable both in light and spectrum.

The available light observations start as far back as 1890. The first reference(2) to magnitude observations covers the years 1890-1922 and is based on 101 photographs which are distributed rather evenly throughout the interval, they show that from 1890 to 1901 there was a slow and apparently steady increase in light from magnitude 9·8 to 9·2; and since 1902 the light has slowly decreased.

Type
Part IV Symposia
Information
Transactions of the International Astronomical Union , Volume 8 , September 1954 , pp. 842 - 848
Copyright
Copyright © Cambridge University Press 1954

References

(1) α = 9h20m·3;δ= -52°21ʹ(1950.0). CD -52°3010 = CPD -52o2262 = HD81137 (Sp.Ma).Google Scholar
(2) Harvard Bull. No. 783, 1923.Google Scholar
(3) Harvard Ann. 115, 95, 1947.Google Scholar
(4) The writer understands that the spectrum was taken in 1902.Google Scholar
(5) Cannon, A. J. and Mayall, M. W.: Harvard Ann. 112, 3, 121 (Chart 101), 1949.Google Scholar
(6) For the classification we have used the prints in Morgan, Keenan and Kellman's Atlas of Stellar Spectra (Chicago: The University of Chicago Press, 1943) and Keenan's paper in the Ap. J 95, 461, 1942 (McDonald Contr. No. 48), but the unavailability of suitable standards obtained with the same dispersion makes our classification not entirely certain.Google Scholar
(7) The writer is very much indebted to Drs P Swings and J. Swensson for kindly calling his attention to these calculations and for putting them at his disposal before publication.Google Scholar
(8) These data were furnished to Dr Swensson by Mrs C. E. Moore-Sitterly before the publication of the second volume of her Atomic Energy Levels (National Bureau of Standards Circular No. 467, 1952).Google Scholar
(9) Swings, Cf. and Struve, : Ap. J 101, 224, 1945; McDonald Contr. No. 103.Google Scholar
(10) In a private communication, Dr P Swings remarked that the evidence in favour of [Cr 11J does not appear conclusive to him and that a study of the infra-red region would help.Google Scholar
(11) Unpublished. I owe this reference to Dr P. Swings.Google Scholar
(12) Swings, Cf.: J.O.S.A. 41, 153, 1951.Google Scholar
(13) Ap. J 93, 349, 1941; McDonald Contr. No. 30.Google Scholar