Variations in the shell spectrum of the Be star EW Lacertae
| Autor: | Yu-lian Guo, Hui-lai Cao, Wei-shi Gao |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Physics
Absorption spectroscopy Be star Astrophysics::High Energy Astrophysical Phenomena Astronomy Balmer series Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Schmidt camera Core (optical fiber) Radial velocity symbols.namesake Space and Planetary Science symbols Astrophysics::Solar and Stellar Astrophysics Absorption (electromagnetic radiation) Spectrograph |
| Zdroj: | Chinese Astronomy and Astrophysics. 11:119-123 |
| ISSN: | 0275-1062 |
| DOI: | 10.1016/0275-1062(87)90034-8 |
| Popis: | Between 1982 and 1984 we carried out spectral observations of EW Lac with a grating spectrograph on the 60/90 cm Schmidt telescope of Beijing Observatory. We found that its Balmer shell absorption lines changed within a short time, from a single absorption core to a double absorption core and later changed back to a single core. We measured the radial velocity of the Balmer lines and did not find any obvious Balmer progression, while the radial velocity of the double core, particularly the V component, showed clear variations in time. We think the variations reflect ejection of shell matter. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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