By Zdeněk Kopal (auth.), Cafer İbanoğlu (eds.)
Since the Nineteen Seventies symposia or colloquia dedicated to contemporary examine on shut binaries were held around the globe virtually every year. At conferences of the overall meeting of the foreign Astronomical Union this subject has additionally been mentioned intimately at shows in a number of fee conferences and likewise as invited talks through best astronomers within the box. lately, basic adjustments have taken position within the research of shut binaries a result of advancements in observational concepts, extension of observations from X-ray to radio areas of the electromagnetic spectrum, and advances in theoretical reviews. For greater than a decade, a bunch of astronomers at Ege collage Observatory has been focusing on lively shut binaries with specific emphasis at the behaviour of the sunshine curves of chromospherically lively platforms. therefore, we made up our minds to arrange a global assembly in Western Anatolia, the place this a part of Turkey were the cradle for nice advancements in technology in the course of antiquity. KUljadasi, positioned purely mins clear of Ephesus, one of many seven wonders of the area, was once chosen to be the assembly website. shut binary structures represent a truly wealthy resource of knowledge in regards to the actual homes of the part stars. a few platforms are eclipsing variables, the place periodic recurrences of eclipses are saw as relatively short decreases within the overall brightness of the binary procedure. detailed tools of photometric observations give the opportunity to acquire the sunshine diversifications of those platforms as a result of eclipses and different phenomena.
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Cafer ibanoglu and Janet Mattei for inviting me to participate in the NATO-ASI meeting on Active Close Binaries at Ku§adasl, Turkey. We also wish to thank Dr. Elizabeth Jewell for assisting in the preparation of the manuscript and Dr. David Bradstreet for reading the text. 6. References Ahmad, I. A. 1989, Ap. , 338, 1011. Ahmad, I. , Chapman, R. , and Kondo, Y. 1983, Astron. , 126, L5. W. 1963, Astrophysical Quantities, 2d ed. (London, The Athlone Press). AI-Naimy, H. M. K. (1977), Ap. Sp. , 53, 181.
Please look again at Figure 1. 40 • As the Figure shows, during the primary eclipse, the secondary star totally eclipses not only the gainer, but its entire accretion disk as well. However, at phases outside primary eclipse, the front portion of the disk is seen projected on part of the globe of the primary (normally I would say" on the disk of the primary" , but a double use of the term "disk" would introduce confusion). S V star, we expect to see absorption lines. They are indeed observed, as Etzel's optical and my IUE spectra show.
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Active Close Binaries by Zdeněk Kopal (auth.), Cafer İbanoğlu (eds.)