Variable wind velocity in 59 CYG

Details Variable wind velocity in 59 CYG Variable wind velocity in 59 CYG

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980esasp.157..151d&link_type=abstract

The second European International Ultraviolet Explorer (IUE) Conference, held 26-28 March 1980 in Tübingen, West Germany. Edited

Computer Science

13

B Stars, Iue, Stellar Mass Ejection, Stellar Winds, Chromosphere, Cygnus Constellation, Emission Spectra, H Alpha Line, Line Spectra, Variable Stars

Scientific paper

Combined UV and visual observations of 59 Cyg in 1972, 1975, late 1978, and at several epochs in 1979 are summarized. Visual observations suggest a similar pattern of long term variability for 59 Cyg and gamma Cas, within which are placed the UV data on 59 Cyg. During the 1978-79 epoch of small but increasing H alpha emission, the C4 and N5 lines reached maximum expansion velocities of some 750 km/sec, whereas the Si4 lines showed neither appreciable displacements nor asymmetry. Line displacements of N5 varied by a factor 2, and appeared to oscillate, but line components that correspond to violet displacements 100 km/s were not identified. This 1978-79 situation is unlike the situation of strong Be phase of 59 Cyg in 1972 and 1975, and of Gamma Cas in 1978-79, where expansion at less than 100 km/s was observed.

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