The Hβ and Hγ lines in the spectrum of V1057 Cyg |
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| Authors: | B N Rustamov |
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| Institution: | (1) Shemakha Astrophysical Observatory, Academy of Sciences of Azerbaijan, Shemakha, 373243, Azerbaijan |
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| Abstract: | We present the equivalent widths of the Hβ and Hγ absorption lines in the spectrum of V1057 Cyg measured from 1978–1990 spectrograms. The mean equivalent widths of these lines decreased approximately twofold during 1978–1985 and somewhat increased during 1987–1990. Using published UBV photometry, we show that there has been a correlation between the Hβ equivalent width and the ?U-B? color since 1983, with ?W λ(Hβ)? increasing with decreasing?U-B? Based on our spectroscopic and photometric observations in 1978–1990, we assume that V1057 Cyg has passed to a qualitatively new stage of its development after 1985. |
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| Keywords: | stars— variable and peculiar |
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