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Time variations of uv emission features of be stars
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bahng, J. D. R. |
| Copyright Year | 1975 |
| Description | The UV spectra of three Be stars (gamma Cas, sigma Tau, eta Cen) were studied. Of the six Be stars observed in the first four lines of the Balmer series, three stars showed at least one of the Balmer lines to be variable in the equivalent width amounting to a few percent with time scales of 3 to 30 minutes. Photoelectric spectrum scans of five southern Wolf-Rayet stars showed night-to-night variations. A simple model is proposed to account for the behavior of these emission lines. Scans of gamma square Vel showed rapid variations of emission strengths of He II 4686 and C III - IV 4650. These variations have time scales of 1 minute and longer. Night-to-night variations were also found. Scans of four Be stars in H alpha showed a definite variation of 3 to 4 percent, with time scales of 1 minute and longer in sigma Tau. In 48 Per and kappa Dra the variations are not as well established. No variation of any significance was found for nu Gem. |
| File Size | 949446 |
| Page Count | 35 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19750014142 |
| Archival Resource Key | ark:/13960/t78s9h80b |
| Language | English |
| Publisher Date | 1975-01-31 |
| Access Restriction | Open |
| Subject Keyword | Astronomy Stellar Spectra Photoelectric Effect Ultraviolet Radiation Emission Spectra Wolf-rayet Stars Astronomical Models H Alpha Line Line Spectra Variable Stars Balmer Series Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
