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Author : Cezary Szyszka
Release : 2010
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Expansion in the Planetary Nebula NGC 6302 by : Cezary Szyszka
Download or read book Expansion in the Planetary Nebula NGC 6302 written by Cezary Szyszka. This book was released on 2010. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James B. Kaler
Release : 1974
Genre :
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Book Synopsis The Expansion and Possible Structure of the Planetary Nebula NGC 2440 by : James B. Kaler
Download or read book The Expansion and Possible Structure of the Planetary Nebula NGC 2440 written by James B. Kaler. This book was released on 1974. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Paula M. Moraga Baez
Release : 2021
Genre : Planetary nebulae
Kind : eBook
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Book Synopsis Investigating Expansion and Extinction in the Planetary Nebula NGC 7027 with HST by : Paula M. Moraga Baez
Download or read book Investigating Expansion and Extinction in the Planetary Nebula NGC 7027 with HST written by Paula M. Moraga Baez. This book was released on 2021. Available in PDF, EPUB and Kindle. Book excerpt: "Planetary nebulae are a late stage of the evolution of intermediate-mass (~1-8 solar mass) stars. A planetary nebula is formed after an asymptotic giant branch star's ejected mass becomes ionized by the stellar core, which is on its way to becoming a white dwarf. The shaping of planetary nebulae is slowly unveiled through studies of young and evolving nebulae such as NGC 7027. I have conducted an extensive analysis of the first-ever suite of contemporaneous panchromatic Hubble Space Telescope Wide Field Camera 3 (HST/WFC3) images of NGC 7027, extending from near-UV to near-IR. Extinction correction is performed successfully on several HST/WFC3 images, facilitating analysis of the spatial distribution of H recombination and forbidden emission lines within the nebula. The resulting extinction-corrected line ratio images and line ratio diagnostic, as well as an analysis of forbidden emission lines, are used are used to distinguish between photoionization and shock-ionized regions and to place constraints on the gas densities in the shocked regions. This analysis revealed regions dominated by shocks in the NW and SE lobes of NGC 7027. All of these results provide insight on the strength of NGC 7027's outflows, confirming previous assertions that NGC 7027 is among the youngest and most rapidly evolving PNe."--Abstract.
Author : D.E. Osterbrock
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 737/5 ( reviews)
Book Synopsis Planetary Nebulae by : D.E. Osterbrock
Download or read book Planetary Nebulae written by D.E. Osterbrock. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: This written account of the Symposium on Planetary Nebulae was prepared from manuscripts submitted by the participants. Nearly every paper that was presented at the meeting is reproduced here, in either complete or abbreviated form. The dis cussions have been somewhat shortened and rearranged, but we have tried to preserve the essential points and the general tenor of the exchanges. Participants who spoke in the discussion were asked immediately for written remarks, which were then edited, reproduced, and circulated at the meeting by the highly effective local Secretariat organized by Dr Perek. In addition, notes of the discussion taken by Mrs Edith F. Swan and by the undersigned were used. We wish to thank all the authors for their unusually good cooperation. We are especially grateful to Dr Minkowski, who kindly provided many excellent repro ductions of Mount Wilson and Palomar photographs, mostly taken by himself, of various planetary nebulae. We are particularly indebted to Mrs Swan, who attended the Symposium, made notes on the papers and discussions as they occurred, and did much of the checking and editing of the manuscripts. In addition, we are very grateful to Mrs Evelyn Seaver, who also did much of the checking, editing, and retyping of manuscripts, and to Dr B.L. Webster, Miss Rebecca Todd, Mr Joseph Tapscott, and Mr Dennis Schatz, who provided excellent assistance in the preparation of this volume.
Author : Silvia Torres-Peimbert
Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 652/5 ( reviews)
Book Synopsis Planetary Nebulae by : Silvia Torres-Peimbert
Download or read book Planetary Nebulae written by Silvia Torres-Peimbert. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: Every 5 years since 1967 a meeting has been held to discuss the subject of planetary nebulae and their central stars. Previous meetings have been held in Tatranska Lomnica (Czechoslovakia); Liege (Belgium); Ithaca, New York (U. S. A); and London (Great Britain). IAU Symposium 131 was sponsored by IAU Commision 34, on Interstellar Matter and co-sponsored by IAU Commisions 35 and 36 on Stellar Constitution and Theory of Stellar Atmospheres. The symposium was held at the Universidad Nacional Autonoma de Mexico in Mexico City, October 5-9, 1987. It took place in one of the old buildings of the University of Mexico in the downtown area. The inner patio of the building provided very pleasant surroundings for the poster sessions and for extensive discussions among the participants. The meeting was attended by 160 scientists from 22 countries. The Scientific Organizing Committee,under the chairmanship of J.B. Kaler, prepared a comprehensive scientific program based on a set of invited presentations. All contributed papers were presented in poster form. The Scientific Organizing Committee would like to thank the staff of the University of Illinois Department of Astronomy: Dr. Ron Allen for granting financial support; Carol Stickrod, Louise Browning, Deana Griffin and Sandie Osterbur for their help with the organization. IAU provided economic assistance to a group of young astronomers.
