Download or read book Les n buleuses plan taires written by and published by . This book was released on 1973 with total page 516 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 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Nebuleuses Planetaire written by and published by . This book was released on 1986* with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Planetary Nebulae written by D.E. Osterbrock and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 473 pages. 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.
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 N buleuses plan taires ressource lectronique written by Denis Bergeron and published by [Val-des-Bois, Québec] : Denis Bergeron. This book was released on 2004* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CONTRIBUTION A L ETUDE MORPHOLOGIQUE DES NEBULEUSES PLANETAIRES written by G.. PASCOLI and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PREMIERE PARTIE DE L'ETUDE CONCERNE LE CHAMP DES VITESSES DANS LA NEBULEUSE PLANETAIRE IC 418, CHOISIE POUR SA REGULARITE. ON A PU MONTRER QUE LA VITESSE D'EXPANSION DU GAZ EN UN POINT QUELCONQUE EST UNE FONCTION LINEAIRE DE LA DISTANCE DE CE POINT AU CENTRE DE LA NEBULEUSE. LA SECONDE PARTIE, PORTANT SUR LES CHAMPS DE TEMPERATURE, S'APPUIE SUR L'ETUDE DE NGC 2440. LA TROISIEME PARTIE CONCERNE LA NATURE DES ELLIPSOIDES NEBULAIRES. ON A PU MONTRER QUE 3 ESPECES D'ELLIPSOIDES COEXISTENT; POLATE, OBLATE ET TRIAXE. ENFIN ON S'INTERROGE SUR LES CAUSES PHYSIQUES DE LA MORPHOLOGIE DES NEBULEUSES PLANETAIRES
Download or read book Planetary Nebulae written by G.A. Gurzadyan and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: The publication in English of this monograph seems to me to indicate the ever increasing interest of astrophysicists in the physical and dynamical problems of planetary nebulae-one of the most interesting and fruitful branches of theoretical astrophysics. Their interest in part arises from the fact that the methods of identify ing the physical processes occurring in planetary nebulae, as well as the many theo retical results, are now acquiring a degree of uni versality as their sphere of application increases. Finally, the special cosmic significance of planetary nebulae is becoming apparent. The English edition of Planetary Nebulae differs considerably from the Russian version published in 1962, primarily because of the new results included in it, but also because of numerous editorial revisions. The problems of magnetic fields and hydrodynamics in planetary nebulae are beginning to occupy an important place in the study of the dynamics of these objects. Recent studies by D. H. Menzel confirm the idea advanced in the present mono graph as to the existence of magnetic fields in planetary nebulae. New light is being cast on the dynamics of planetary nebulae by the hydrodynamic investigations of F. D. Kahn, W. G. Mathews and others. Unfortunately I was not able to include these and other interesting results in the present edition.
Download or read book Astronomy and Astrophysics Abstracts written by S. Böhme and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundamental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ... The abstracts are classified under more than hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Reviews #1 "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine #1
Download or read book Planetary Nebulae and How to Observe Them written by Martin Griffiths and published by Springer Science & Business Media. This book was released on 2012-02-24 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planetary Nebulae and How to Observe Them is for amateur astronomers who want to go beyond the Messier objects, concentrating on one of the most beautiful classes of astronomical objects in the sky. Planetary nebulae are not visible to the naked eye, but they are a fascinating group of telescope objects. This guide enables a user equipped with an average-sized amateur telescope to get the best out of observing them. Topics covered include their astrophysical make-up, history of their discovery, classification and description, telescopes to use, filters, and observing techniques - in short everything anyone would need to know to successfully observe planetary nebulae. The book describes the various forms these astronomical objects can take and explains why they are favorite targets for amateur observers. Descriptions of over 100 nebulae personally observed by the author using telescopes of various sizes are included in the book. Readers can create their own observing program or follow the list of these captivating objects, many of which are found within our own Milky Way Galaxy.
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 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 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 The Physics and Dynamics of Planetary Nebulae written by Grigor A. Gurzadyan and published by Springer Science & Business Media. This book was released on 2013-04-09 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planetary nebulae are the classic subject of astrophysics. The physical pro cesses occurring in this highly ionized gaseous medium, the formation of emis sion lines in clearly specified conditions, the continuous emission extending from the far ultraviolet up to infrared and radio frequencies, the generation of exotic forms of radiation predicted by atomic physics, along with methods for deciphering the observed spectra and detecting physical and kinematic parameters of the radiating medium, etc. - all these problems form the solid foundations of the physical theory of gaseous nebulae. They are an essential part of the arsenal of powerful tools and concepts without which one cannot imagine understanding and interpreting the enormous diversity of processes taking place in the Universe - in gaseous envelopes surrounding the stars of various classes, from cool dwarfs and flare stars up to hot supergiants, as well as in stellar chromospheres and coronae, in atmospheres of unstable and anomalous stars, in circumstellar clouds and gaseous shells born in nova and supernova explosions, in diffuse nebulae and the interstellar medium, in interacting binary systems, in galaxies with emission lines, in quasars, etc. The last thirty years have seen a turning-point in our knowledge concern ing the very nature of planetary nebulae (PNs). The radio emission of PNs was discovered after it was predicted theoretically. On the other hand, the powerful infrared emission discovered both in the continuum and in emission lines was never expected.
Download or read book N buleuses plan taires excit es par un rayonnement X mou written by Grażyna Stasińska and published by . This book was released on 1972 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
