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Activity of the Be star 28 Cygni: 1985–1991

  • Ž. Ružić (a1), V. Vujnović (a1), K. Pavlovski (a1), H. Božić (a1), J. R. Percy (a2), A. Attard (a2), P. Harmanec (a3), J. Horn (a3), P. Koubský (a3) and K. Juza (a3)...

Extract

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).

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References

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Bossi, M., Guerrero, A., Zanin, A.: 1993, A&A 269, 343
Hahula, H., Gies, A.: 1991, BAAS 23, 1379
Pavlovski, K., Ružić, Ž.: 1990, A&A 236, 393
Peters, G.J., Penrod, G.D.: 1988, in Decade of UV Astronomy with IUE ESA SP-281, Vol. 2, 117
Roberts, D.H., Lehar, J., Dreher, J.W.: 1987, AJ 93, 968

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