| 書目名稱 | Hydrogen Deficient Stars and Related Objects | | 副標(biāo)題 | Proceeding of the 87 | | 編輯 | Kurt Hunger,Detlef Sch?nberner,N. Kameswara Rao | | 視頻video | http://file.papertrans.cn/431/430381/430381.mp4 | | 叢書名稱 | Astrophysics and Space Science Library | | 圖書封面 |  | | 描述 | The first helium star was discovered in 1942, the first scientific meeting on the subject, however, took place in 1985. The meeting was hence long overdue for, in the meantime, a substantial amount of material had been accumulated by a rather small, but active scientific community. Hence, it appeared necessary to review the field in order to define the subject, assess its present status and discuss future developments. Hydrogen deficiency is a widespread phenomenon, occurring in a large variety of stellar and nonstellar objects. It can be readily detected in B stars as these exhibit both hydrogen and helium lines, if the elements are present in appreciable amounts. It becomes less manifest in cool stars, where the temperature is too low to excite helium and where one has to devise indirect methods for proving hydrogen deficiency. Clearly, it was not possible to discuss the whole complex of hydrogen deficiency, i.e. in both stars and diffuse matter, but rather to concentrate on the issue of helium stars. | | 出版日期 | Conference proceedings 1986 | | 關(guān)鍵詞 | Variation; observatory; planet; spectroscopy; star; stars; stellar | | 版次 | 1 | | doi | https://doi.org/10.1007/978-94-009-4744-3 | | isbn_softcover | 978-94-010-8608-0 | | isbn_ebook | 978-94-009-4744-3Series ISSN 0067-0057 Series E-ISSN 2214-7985 | | issn_series | 0067-0057 | | copyright | D. Reidel Publishing Company, Dordrecht, Holland 1986 |
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