Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..393p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 393-398.
Astronomy and Astrophysics
Astrophysics
12
B Stars, Stellar Oscillations, Stellar Spectrophotometry, Variable Stars, Light Curve, Stellar Color, Stellar Luminosity, Ubv Spectra
Scientific paper
Photometric observations of the Be star 28 Cyg in 1985 reveal light variations with large amplitude (around 0.85 mag in the V band), and only marginal color changes. Period analysis yields ambiguous results as from the appearance of the lightcurve alone it is not possible to choose which period is the correct one (P = 0.64 d for single-wave or its double value for double-wave light curve appearance). This finding corroborates Peters's and Penrod's (1988) results based on the detailed line-profile analysis. A shorter period is due to pulsations in the low-order nonradial mode l = 2, but due to wave behavior, the light-curve is expected to be of the double-wave variety. The scatter around the mean light-curve is still larger than the assumed observational error and further periodicities could be present in the data. The CLEAN algorithm was used to extract these frequencies, which were further adjusted in a multifrequency fit. Results are discussed in the framework of a nonradial pulsation hypothesis.
Pavlovski Kresimir
Ruzic Z.
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