Image-tube spectroscopic studies of rapid variables. III Hydrogen bombs in SS Cygni

Details Image-tube spectroscopic studies of rapid variables. III Hydrogen bombs in SS Cygni Image-tube spectroscopic studies of rapid variables. III Hydrogen bombs in SS Cygni

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..256w&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 256-267. NSF-supported research.

Other

32

Binary Stars, Image Tubes, Nuclear Fusion, Radial Velocity, Stellar Spectra, Variable Stars, Absorption Spectra, Emission Spectra, Line Spectra, Spectrum Analysis, Stellar Motions, Ultraviolet Spectra

Scientific paper

Radial-velocity observations of SS Cyg made in 1970 and 1971 are discussed. Time-resolved spectra in 1970 furnish additional examples of the 'ultraviolet flares' observed previously by Walker and Chincarini (1968), and detailed analysis indicates that these flares are caused by the brief appearance of extremely broad H and sometimes Ca II and He I emission features with total widths of approximately 94 A, often accompanied by a much smaller increase in continuum emission. The form of the line profiles suggests that the broadening is due to mass motions of up to about 3500 km/sec with a non-Maxwellian distribution of velocities. Inspection of similar time-resolved spectra of AE Aqr, T CrB, MV Lyr, RW Tri, and UX UMa suggests that this type of broad-line hydrogen emission flare occurs in at least two other nova-like systems, RW Tri and AE Aqr. In these stars, the frequency of occurrence of this type of flare is lower, being, respectively, about two-thirds and one-tenth of the frequency in SS Cyg.

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