Download or read book MODELES DE NEBULEUSES PLANETAIRES written by GREGORY.. DUDZIAK and published by . This book was released on 1998 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE PRESENTE DES MODELES DE PHOTOIONISATION ET DES MODELES CINEMATIQUES POUR PLUSIEURS NEBULEUSES PLANETAIRES (NP) DANS LE BUT DE DETERMINER DE FACON COHERENTE LEURS PROPRIETES PHYSIQUES ET DYNAMIQUES. DES SPECTRES VISIBLES A MOYENNE RESOLUTION ONT ETE ACQUIS AUX TELESCOPES NTT ET 1.5M DE L'ESO (CHILI). DES DONNEES CINEMATIQUES POUR PLUSIEURS RAIES D'EMISSION ONT ETE OBTENUES AU SPECTROMETRE FABRY-PEROT A BALAYAGE TAURUS-2 INSTALLE AU FOYER DU WHT (LA PALMA). DES MODELES DE PHOTOIONISATION DES DEUX NPS RECEMMENT IDENTIFIEES DANS LA GALAXIE NAINE SAGITTARIUS PERMETTENT D'AFFINER LEURS ABONDANCES ET DE CONFIRMER QU'ELLES SONT RICHES EN CARBONE. UNE ETUDE COMPAREE PAR DEUX CODES DE PHOTOIONISATION INDEPENDANTS PERMET DE MIEUX APPRECIER LA STABILITE DES SOLUTIONS ET LES INCERTITUDES LIEES AUX HYPOTHESES DES MODELES. UN MODELE DE PHOTOIONISATION DE LA NP NGC 3242, TENANT COMPTE D'INFORMATIONS TIREES D'IMAGES EN BANDE ETROITE ET DE SPECTRES UV, RENCONTRE DES DIFFICULTES AVEC LA RAIE C IV 1549A. UN MODELE CINEMATIQUE 3D DE NGC 3242 EST PRESENTE. LES PRINCIPAUX PARAMETRES EN SONT (1) LA VARIATION RADIALE DE L'EMISSIVITE, (2) LA STRUCTURE 3D ET L'ORIENTATION DE LA NEBULEUSE ET (3) LA LOI DE VITESSE D'EXPANSION RADIALE. DES PROFILS SYNTHETIQUES DE RAIES SPECTRALES VUES A TRAVERS DIFFERENTES FENTES SONT COMPARES AUX OBSERVATIONS, METTANT EN EVIDENCE UN GRADIENT DE VITESSE DANS L'ENVELOPPE. LES MICROSTRUCTURES (FLIERS) DE CETTE NEBULEUSE NE SONT PROBABLEMENT PAS SUPERSONIQUES. DES ETUDES CINEMATIQUES DE NGC 6826 ET IC 4593 SONT EGALEMENT PRESENTEES. ENFIN, LA MORPHOLOGIE ET LA STRUCTURE IONIQUE DE QUATRE NP ELLIPTIQUES IMAGEES PAR HST ET PRESENTANT DES MICROSTRUCTURES SONT DISCUTEES. L'IMPORTANCE DE LA DETERMINATION DE LA STRUCTURE SPATIALE ET CINEMATIQUE 3D DES NPS AFIN DE MIEUX CERNER LA FORMATION ET L'EVOLUTION DE LEUR MORPHOLOGIE A TOUTE ECHELLE EST SOULIGNEE.
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 Planetary Nebulae written by Y. Terzian and published by Springer Science & Business Media. This book was released on 1978-03-31 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of IAU Symposium No. 76 held at Cornell University, Ithaca NY, USA, 6-10 June 1977
Download or read book Planetary Nebulae written by Stuart R. Pottasch and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to give a detailed description of the planetary nebulae including the relevant astronomical observations and their interpretation. Considerable attention is given to the evolution of these objects as well as to their physical characteristics. I t is hoped that the book be useful to both advanced research workers and to students with some background in astronomy. In this regard, the book should serve as a text as well as a reference work. The many tables included are expected to be useful for both purposes. The references are generally not included in the text except for historical purposes in an effort to improve readability. References are given at the end of each chapter together with sufficient text to describe their content. No attempt has been made to make the list of references complete; on the contrary it has generally been limited to the most recent literature on the subject which in turn refers to earlier research. Again, exceptions have been made for references of historical interest.
Download or read book The Importance of Binaries in the Formation and Evolution of Planetary Nebulae written by Henri M. J. Boffin and published by Springer Nature. This book was released on 2019-09-04 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is now clear that a binary evolutionary pathway is responsible for a significant fraction of all planetary nebulae, with some authors even going so far as to claim that binarity may be a near requirement for the formation of an observable nebula. This has led to the requirement that textbooks most likely need to be rewritten. Building upon the review of Jones and Boffin in Nature Astronomy (2017), this Springer Brief takes a first step in this direction. It offers the first expanded presentation of all the theoretical and observational support for the importance of binarity in the formation of planetary nebulae, initially focusing on common envelope evolution but also covering wider binaries. This book emphasises the wider impact of the field, highlighting the critical role binary central stars of planetary nebulae have in understanding a plethora of astrophysical phenomena, including type Ia supernovae, chemically peculiar stars and circumbinary exoplanets.
Download or read book Planetary Nebulae as Astronomical Tools written by Ryszard Szczerba and published by American Institute of Physics. This book was released on 2005-12-07 with total page 806 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planetary nebulae are gaseous envelopes ejected from solar-type stars at the end of their lives. They have traditionally been considered by specialists as testbeds for theories of stellar evolution and as laboratories to study the physics of warm nebular gases. The interest of the astronomical community in planetary nebulae has increased considerably in recent years due to the demonstration that planetary nebulae can be used to measure the distances and masses of galaxies or to reveal the presence of stars outside galaxies. This conference explored the entire potential of planetary nebulae as tools for astronomy.
Download or read book Planetary and Proto Planetary Nebulae From IRAS to ISO written by Andrea Preite Martinez and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are two questions that we can ask ourselves in order to describe this workshop. The first question is a double question: why a conference on this subject and why a workshop? The first idea of organizing this workshop came while reading the scientific objectives of one of the instruments onboard the ISO satel lite (a phase A document concerning the IR camera). On going through the scientific motivations for building the instrument I realized with surprise that no mention was made of Planetary Nebulae (PN). At present this is no longer true. There is a chapter indicating the capabilities of the camera in the PN field and what we can reasonably expect from that instrument. But it was at this moment that the first idea of organizing a workshop on the subject of PN came. Of course there are other, stronger motivations. The first one is that I think this is the right moment after IRAS. I think we all spent the last two or three years working on IRAS data. IRAS represented a corner-stone for those working on Planetary Nebulae: the amount of data that came out of the instruments onboard the satellite was enormous and opened up new ways of looking at planetary nebulae, as well as at other fields.
Download or read book Les Nebuleuses Planetaires written by and published by . This book was released on 1973 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Planetary Nebulae Beyond the Milky Way written by L. Stanghellini and published by Springer Science & Business Media. This book was released on 2006-07-30 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, improved observational capabilities have allowed the study of fainter and fainter extra-galactic planetary nebulae in galaxies well beyond the Milky Way. This book result from a workshop held at ESO headquarters in Garching in 2004, the first devoted to Extra-galactic Planetary Nebulae. A wide range of topics is covered, from stellar and nebular astrophysics to galactic dynamics and galaxy clusters, making this a reference of broad astrophysical interest.
Download or read book Transactions of the International Astronomical Union written by and published by CUP Archive. This book was released on with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Les n buleuses plan taires written by and published by . This book was released on 1973 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Planetary Nebulae in Our Galaxy and Beyond IAU S234 written by International Astronomical Union. Symposium and published by Cambridge University Press. This book was released on 2006 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planetary nebulae represent the brief transition between Asymptotic Giant Branch stars and White Dwarfs. As multi-wavelength laboratories they have played a key role in developing our understanding of atomic, molecular, dust and plasma processes in astrophysical environments. The means by which their wonderfully diverse morphologies are obtained is currently the subject of intense research, including hydrodynamical shaping mechanisms and the role of binarity, stellar magnetic fields and rotation. Their contribution to the chemical enrichment of galaxies is another very active research area, as is the ever growing use of their narrow high luminosity emission lines to probe the dynamics and mass distributions of galaxies and the intergalactic media of clusters of galaxies. IAU S234 summarises the current status of research on the properties and processes of planetary nebulae, as reported in reviews and papers by leading experts working in the field.
Download or read book Les n buleuses written by Amédée Guillemin and published by . This book was released on 1880 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: La nébuleuse spirale des Chiens de chasse, vue dans le télescope de lord Rosse; Nébuleuse spirale du Triangle (H 131), vue dans le grand télescope de Parsonstown; Nébuleuse del a Dorade, au milieu de la plus grandes des Nuées de Magellan ...
Download or read book Literature 1972 Part 1 written by Siegfried Böhme and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of Iiterature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original Iiterature and publication of the abstracts will not exceed eight months. This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. Valurne 7 contains Iiterature published in 1972 and received before August 15, 1972; some older Iiter ature which was received late and which is not recorded in earlier volumes is also included.
Download or read book The Structure and Evolution of Planetary Nebulae and Their Envelopes written by Grant Trevor Gussie and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1992 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Contribution l tude cin matique et dynamique des n buleuses plan taire dans la galaxie written by Sophie Durand and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'objectif de cette thèse est d'apporter quelques éléments nouveaux sur la structure et l'évolution de la Galaxie via l'étude cinématique et dynamique nébuleuses planétaires. La première partie de cette thèse présente une étude cinématique des nébuleuses planétaires galactiques. Toutes les vitesses radiales existantes ont tout d'abord été compilées dans un catalogue : la plupart des vitesses provenant de la littérature ont été corrigées de la présence d'écarts systématiques, écarts évalués par comparaison directe avec des données inédites à hautes résolution. L'échantillon ainsi rassemblé et calibré de façon homogène constitue la meilleure base de données actuelle concernant les vitesses radiales des nébuleuses planétaires. Leurs cinématiques sont examinées lors d'une analyse préliminaire, à la fois dans le bulbe et dans le disque. La seconde partie de cette thèse concerne l'analyse dynamique des nébuleuses planétaires dans la Galaxie, consistant globalement à évaluer les coefficients d'une combinaison linéaire de familles de fonctions de distribution analytique. Cette évaluation se fait en estimant différents observables représentant ici les 3 premiers moments de la distribution de vitesse des nébuleuses planétaires. Les principaux composants galactiques ainsi que leurs lois de densité sont identifiés après déprojection de la carte de densité. Néanmoins, une rapide comparaison qualitative données/modèle montre que le modèle à 2 intégrales ne s'ajuste pas bien aux cinématiques de l'échantillon, et plus particulièrement dans les disques épais. Cela laisse 2 hypothèses : soit l'échantillon en question est très incomplet dans le disque, soit il existe bel et bien une troisième intégrale dans la fonction de distribution des nébuleuses planétaires.
Download or read book Summer School on Interstellar Processes written by David J. Hollenbach and published by . This book was released on 1986 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
