Variations in the shell spectrum of the Be star EW Lacertae |
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| Institution: | 1. LIAG, Leibniz Institute for Applied Geophysics, Stilleweg 2, 30655 Hannover, Germany;2. BGR, Federal Institute for Geosciences and Natural Resources, Stilleweg 2, 30655 Hannover, Germany;3. Helmholtz-Centre Potsdam, German Research Centre for Geosciences – GFZ, Telegrafenberg, 14473 Potsdam, Germany;4. Georg-August-Universität Göttingen, Goldschmidtstraße 3, 37077 Göttingen, Germany;1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing, 100083, China;2. School of Energy Resources, China University of Geosciences, Beijing 100083, China;3. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China;2. School of Energy Resources, China University of Geosciences, Beijing 100083, China;3. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;4. School of Geosciences, China University of Petroleum, Qingdao 266580, China |
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| Abstract: | 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. |
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