Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.117p&link_type=abstract
In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 117-120 (SEE N89
Astronomy and Astrophysics
Astronomy
12
B Stars, Iue, Spaceborne Astronomy, Stellar Winds, Ultraviolet Astronomy, Ultraviolet Spectra, Variability, Stellar Mass Ejection, Stellar Rotation
Scientific paper
Simultaneous high resolution IUE and ground-based Reticon observations were combined to look for a modulation of the wind in the Be star 28 Cyg as a function of the phases of its nonradial modes. Throughout the observing run, the star is found to be pulsating in 2 well-behaved modes (l = 2, 10) with periods of 16.5 and 3.23 hr, respectively. The strength and profile of the C IV wind line varies on a time scale of 0.5 to 1 hr, but shows no evidence of repeating with the phase of the l = 10 mode. However, the equivalent width of the C IV feature does appear to correlate with the phase of the l = 2 mode. The C IV tends to be stronger and shows more prominent structure on its violet wings (-400 less than Vr less than -300 km/s) as a hot wave crest comes into view (phi 2 = 0.0 to 0.2) on the limb of the star's approaching hemisphere.
Penrod Donald G.
Peters Geraldine Joan
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