Download or read book Les transitions interdites dans les spectres des astres written by and published by . This book was released on 1969 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Nature of Symbiotic Stars written by M. Friedjung and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many aspects of symbiotic stars have long puzzled astronomers. For instance while most students of the subject have considered them binary, many have at different times supported single star models. The nature of their outbursts is uncertain, while the dividing line between symbiotic stars and novae is unclear. In any case doubts can even be raised as to whether a class of "Symbiotic Stars" really exists. Much new data has been obtained in recent years, in particular from the study of radiation outside the visual region. Many symbiotic stars have been studied in the UV with IUE since 1978, while X-rays were det ected in a few cases with the Einstein satellite. There have been a num ber of infrared and radio studies, and the number of known symbiotic stars has also considerably increased. Furthermore theoretical ideas have in recent years been considerably enriched by concepts of stellar winds, and accretion phenomena in binaries including accretion disks. It was there fore extremely opportune and timely to hold the first international meet ing exclusively devoted to these stars, so as to consider the new results from such a wide range of observations in different spectral regions, and the conclusions which can be drawn for possible models as well as theories of the nature and structure of symbiotic stars. After a session devoted to new observations in different spectral regions, a session was spent considering some individual stars.

Download or read book Elements and the Cosmos written by Bernard Ephraim Julius Pagel and published by Cambridge University Press. This book was released on 1992-10-15 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: While there have been many books on cosmology and galactic and stellar evolution in which abundance analysis of astrophysical objects has played some part, this book is the first one for several years where specialists in the various relevant fields discuss the basis and implications of the subject as a whole. The major aim of the book is to bring together the results from high redshift studies and galactic studies in a coherent way and to cover relevant aspects of nuclear and atomic physics.

Download or read book Extended Atmospheres and Circumstellar Matter in Spectroscopic Binary Systems written by A.H. Batten and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proposal to organize a Symposium on circumstellar matter and extended atmo spheres in binary systems was first made by the Dominion Astrophysical Observatory to the Executive Committee of the International Astronomical Union in the summer of 1969. It received the support of the presidents of Commissions 29 (Stellar Spectra), 30 (Radial Velocities), 36 (Stellar Atmospheres), and 42 (Photometric Double Stars). Approval in principle was given by the Executive Committee almost immediately, and the Committee further suggested that the Symposium be officially designated the Struve Memorial Symposium. Final approval was given at the time of the 1970 General Assembly of the Union. when the dates of the Symposium were set for August or September, 1972. The Organizing Committee set up consisted of K. O. Wright (Chairman), A. H. Batten, K. -H. B6hm, A. A. Boyarchuk, G. Larsson-Leander, and M. Plavec. In addition, J. Sahade and F. B. Wood acted as advisory members. Local organization was entrusted to a committee consisting of A. H. Batten, E. K. Lee, and C. D. Scarfe. The final dates selected were September 6-12, 1972, and the Sym posium was held at the Island Hall Hotel, Parksville, B. C. , on Vancouver Island some 90 miles from Victoria. The Organizing Committee attempted to arrange a Symposium of the type in which no contributed papers would be presented and discussion would range as widely as possible over the field covered by the six invited review papers.

Download or read book Les n buleuses plan taires written by and published by . This book was released on 1973 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physics of Formation of FeII Lines Outside LTE written by Roberto Viotti and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: The same kind of physics is frequently common to very different fields of Astrophysics, so experts in each of these fields have often much to learn from each others. It was therefore logical that the International Astronomical Union should sponsor a colloquium about an ion which pro duces many spectral lines that can be used as a diagnostic for many sorts of objects, and which may sometimes have a major influence on physical processes occurring in astro physical sources. The lines of singly ionized iron (FeII) are present in absorption and emission in the spectra of objects such as the Sun, cool stars, circumstellar envelopes of hot stars, novae, diffuse nebulae including the supernova remnants, and active galactic nuclei. These lines are very often formed far from LTE, and their interpretation is not easy in view of the complex Grotrian diagram for FeII, and the gaps in the knowledge of various physical parameters. In addition, the density of very strong FeII lines becomes very large in the ultraviolet, and the lines can play a major role in the line blanketing. They need therefore to be taken into account in any energy balance argument.

Download or read book Variable Stars and Stellar Evolution written by Vicki E. Sherwood and published by Springer Science & Business Media. This book was released on 1975-07-31 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of IAU Symposium No. 67 held in Moscow, U.S.S.R., July 29-August 4, 1974

Download or read book M moires de la Soci t royale des sciences de Li ge written by and published by . This book was released on 1975 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Memorie written by Società astronomica italiana and published by . This book was released on 1970 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Free Radical in Astrophysics written by Polydore Swings and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contributi written by Consiglio nazionale delle ricerche (Italy) Laboratorio di astrofisica speziale and published by . This book was released on 1970 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Les Traumatismes multiples written by and published by . This book was released on 1969 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optical Spectroscopy of Solids written by and published by . This book was released on 1970 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Collection in 8 written by Université de Liège. Institut d'astrophysique and published by . This book was released on 1969 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chiefly reprints.

Download or read book Atomic and Molecular Physics and the Interstellar Matter written by Roger Balian and published by . This book was released on 1975 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contributions from the Dominion Astrophysical Observatory Victoria B C written by Dominion Astrophysical Observatory and published by . This book was released on 1976 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Communications Present es Au Colloque International D astrophysique written by and published by . This book was released on 1973 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: