酷热
发表于 2025-3-23 11:22:37
Singly-Ionized Iron Emission Lines in the Spectra of Early Type StarsThe appearance of singly ionized iron emission lines in the spectra of early type stars is studied, and the results of a spectroscopic investigation of EW Lac and other Be stars are given. We also discuss the atomic processes of excitation of Fe ti in the stellar envelopes using a two-parameter diagram W, ......
outskirts
发表于 2025-3-23 16:43:45
Rapid Variations in the Spectra of , and, , Cas, and , Ophf about one day. Its binary nature is doubtful according to Olsen (1972). We have detected rapid spectroscopic variations in October 1973 when . And had no envelope, that is, when it appeared as a ‘normal’ B star. Spectrograms of 7.2 Å mm. dispersion were obtained at the Haute Provence Observatory with exposure times ranging from 12 min to 52 min.
graphy
发表于 2025-3-23 21:09:44
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奖牌
发表于 2025-3-23 22:30:36
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复习
发表于 2025-3-24 04:54:58
Pleione as a Variable Staric observations in the 1930’s. The light curve of this star from the end of the 19th century to 1954 was studied by Binnendijk (1949, 1955). Botsula and Sharov (1959) and Sharov (1961) added some old and new observations and continued the light curve up to 1959.
北极熊
发表于 2025-3-24 10:36:29
Energy Distributions of Be Starsinuities in emission do exist. Furthermore, the filling in of the Balmer continuum near the discontinuity is usually observed. The continuum emission showing a peak near 1 . is a common feature in the energy distributions presented here..Energy distributions for a number of bright field Be stars are also presented and discussed.
diskitis
发表于 2025-3-24 14:08:13
Be and Shell Stars978-94-010-1498-4Series ISSN 1743-9213 Series E-ISSN 2352-2186
palpitate
发表于 2025-3-24 15:11:30
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我不重要
发表于 2025-3-24 21:59:32
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花束
发表于 2025-3-25 02:28:59
https://doi.org/10.1007/978-1-4899-0936-7e fait partie de notre programme d’observation qui concerne les étoiles Be de magnitude ≤7 et de déclinaison≥ −15°. Parmi les étoiles les plus chaudes de ce programme, on peut signaler au moins deux catégories: