On the variability of VEGA

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Title:		On the variability of VEGA
Authors:		Fernie, J. D.
Affiliation:		AA(David Dunlap Observatory, Richmond Hill, Ontario, Canada)
Publication:		Astronomical Society of the Pacific, Publications, vol. 93, June-July 1981, p. 333-337. Research supported by the Natural Sciences and Engineering Research Council of Canada. (PASP Homepage)
Publication Date:		06/1981
Category:		Astronomy
Origin:		STI
NASA/STI Keywords:		STELLAR LUMINOSITY, STELLAR SPECTROPHOTOMETRY, VARIABLE STARS, STELLAR MAGNITUDE, STELLAR MASS, UBV SPECTRA
Comment:		A&AA ID. AAA030.113.007
Bibliographic Code:		1981PASP...93..333F

Abstract

The variability of Vega is investigated by direct telescopic (0.5-m) observation, and the results are compared with photometric studies. On two nights Vega was brighter than average by about 0.015 mag, and on one night by about 0.041 + or - 0.005 mag. Although there is evidence suggesting that Vega has occasionally shown definite radial pulsation, the brightening observed is nevertheless attributed to a variability similar to the Delta Scuti-type. Observations made simultaneously on Epsilon (1) Lyr and Epsilon (2) Lyr indicate a constancy to within 0.003 mag.

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