Other
Scientific paper
Jan 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969cokon..65..443l&link_type=abstract
Communications of the Konkoly Observatory, No. 65 (Vol. VI, 1), p. 443-456 (1969)
Other
Scientific paper
Photometric results obtained during 35 days of the international programme on beta Lyrae are compared with observations made in 1958, mainly at the Lick Observatory. From the minimum epochs of the two seasons a period of 12.9355 days obtained. The total B magnitude is found about 0.10 mag. fainter and the colour about 0.05 mag. redder in 1959 than 1958. A slow decrease in brightness during the 1959 campaign is indicated. The depths of the minima are about the same as in 1958, but the bottoms of the primary minima show great dissimilarities among themselves. The first minimum, on August 12, 1959, was almost flat, and the nearly constant phase had a duration of about 0.70 days. The other two primary minima, on August 25 and September 7, 1959, had bottom widths of similar duration, but exhibited pronounced dips shortly after mid-eclipse. The rising branches from the primary minima are steeper than in 1958, occured at phases about 0.24 and 0.49, respectively, or somewhat earlier than in 1958. The B-V curve of 1959, showing the reddening at primary eclipse, is suspected to have a narrow "blue-top" at mid-eclipse. Another feature of the colour variation is indication of a small "red-dip" at about phase 0.37.
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