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- W4253628636 abstract "28 Cyg (V1624 Cyg, HD 191610, HR 7708; B2e, v sin i = 310 km s -1 ) has been the target of several observational projects, and in 1988 of a large international campaign. This attention was inspired by several photometric studies and especially by the 1985 nearly simultaneous optical and UV spectroscopic monitoring by Peters & Penrod (1988). They found that the line-profile variations were controlled by two frequencies, 1.45 c/d, and 7.43 c/d, which they identified with sectorial pulsations of modes l = 2, m = +2 and l = 10, m = +10. Rapid changes (0.5 to 1 hr) of the CIV wind profile were found; its equivalent width appeared to correlate with the phase of the l = 2 mode. Pavlovski & Ružić (1990) - who independently analysed Hvar 1985 UBV photometry of 28 Cyg - found periodic light variations with a double-wave light curve and a frequency of 1.54 c/d. However – because of the residual scatter around the mean light–curve – the authors tentatively suggested possible multiperiodicity (1.54, 1.33, and 0.95 c/d)." @default.
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- W4253628636 date "1994-01-01" @default.
- W4253628636 modified "2023-10-17" @default.
- W4253628636 title "Activity of the Be star 28 Cygni: 1985–1991" @default.
- W4253628636 cites W1974913150 @default.
- W4253628636 doi "https://doi.org/10.1017/s0074180900214629" @default.
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