Observations of fuors. I. Light curve of V 1057 Cyg

Journal Article · Fri Jan 01 00:00:00 EST 1988 · Astrophysics (Engl. Transl.); (United States)

DOI:https://doi.org/10.1007/BF01008190· OSTI ID:7183058

Ibragimov, M A; Shevchenko, V S

The photographic magnitudes m/sub pg/, m/sub pv/, m/sub pr/ of the fuor V 1057 Cyg obtained during the period July 1968-August 1970 and photoelectric UBVRI' observations during the period July 1078-December 1985 are given. At the time of the rise and the light maximum of V 1057 Cyg, 26 estimates were obtained of m/sub pg/, 20 of m/sub pv/, and three of m/sub pr/. The color index upper limit V - I < 3.5 was obtained in the pre-outburst epoch. Analysis of the B, V, R light curves obtained from 300 observation nights reveals a periodic component in the small-scale light curve with a period of about 12 days and an amplitude of about 0.1 V. There has been a further slowing down in the rate of decrease of the brightness: from 1982 through 1986 the brightness of V 1057 Cyg did not decrease by more than O.2 V, whereas during the preceding four years the decrease in the brightness was ..delta..V > 0.4.

• OSTI ID: 7183058
• Journal Information: Astrophysics (Engl. Transl.); (United States), Vol. 27:1; Other Information: Translated from Astrofizika; 27: No. 1, 5-17(Jul-Aug 1987)
• Country of Publication: United States
• Language: English

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640102* - Astrophysics &amp; Cosmology- Stars &amp; Quasi-Stellar
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