By Zdeněk Kopal (auth.), Cafer İbanoğlu (eds.)
Since the Seventies symposia or colloquia dedicated to contemporary learn on shut binaries were held world wide virtually each year. At conferences of the final meeting of the foreign Astronomical Union this subject has additionally been mentioned intimately at shows in a variety of fee conferences and in addition as invited talks by way of best astronomers within the box. lately, basic alterations have taken position within the learn of shut binaries because of the advancements in observational thoughts, extension of observations from X-ray to radio areas of the electromagnetic spectrum, and advances in theoretical stories. For greater than a decade, a gaggle of astronomers at Ege collage Observatory has been targeting energetic shut binaries with specific emphasis at the behaviour of the sunshine curves of chromospherically energetic structures. 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 excellent advancements in technological know-how in the course of antiquity. KUljadasi, situated purely mins clear of Ephesus, one of many seven wonders of the realm, used to be chosen to be the assembly web site. 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 method. specified tools of photometric observations give the chance to procure the sunshine adaptations of those structures as a result of eclipses and different phenomena.
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Because the Nineteen Seventies symposia or colloquia dedicated to contemporary learn on shut binaries were held world wide virtually each year. At conferences of the final meeting of the overseas Astronomical Union this subject has additionally been mentioned intimately at displays in a number of fee conferences and likewise as invited talks by way of top astronomers within the box.
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Figure 5 illustrates this problem for the eccentric eclipsing binary DI Herculis. 65 deg/100yr. 27 deg/100yr from general relativity and classical effects. 5 ECLIPSING BINARIES AND THE DETERMINATION OF HELIUM ABUNDANCES Although helium is the second most abundant element in the interstellar medium and in stars that are not highly evolved, its precise fractional abundance is not well determined. Direct spectroscopic determination of the helium content is difficult for most stars, including the Sun, because the helium lines are very weak except for very hot stars.
If the mass of the supergiant is 1-2 MG, then the cooler component would have a mass of 5 Me instead of the 13-15 Me assumed in the high mass model. Also, all of the absolute dimensions of the system then correspondingly decrease. 0 mag (consistent with van de Kamp's (1978) distance determination but not with the others). 0 AU, respectively. The semi-major axis of the orbit is 17 AU. The supergiant is still well within its Roche lobe, but little closer to it than in the high-mass model. The post AGB/PPN stage of stellar evolution is very brief for a star as luminous as f Aurigae( '" 103 - 104 yrs) according to Then (1982) and Schonbernger (1983).
Wacker, S. , Baliunas, S. , Loeser, J. , and Raymond, J. C. 1986, in New Insights in Astrophysics: Eight Years of UV Astronomy with IUE, ESA SP-263, 197. Gyldenkerne, K. , 12, 199. Hack, M. and Strickland, D. 1987, in Scientific Accomplishments of IUE, ed. Y. Kondo (D. Riedel Publ. , Dordrecht, Holland), p. 445. Hartigan, P. , Kenyon, S. Skrutskie, M. and Strom, S. 1990, Ap. J. , submitted. Hrivnak, B. J. and Milone, E. F. 1984, Ap. , 282, 748. Hrivnak, B. , Kwok, S. M. 1990, Ap. , in press. -S.
Active Close Binaries by Zdeněk Kopal (auth.), Cafer İbanoğlu (eds.)