Results 91 to 100 of about 207,371 (176)

A Comprehensive Catalog of Emission-line Nebulae, Star Clusters, and Supergiants in M31 from the LAMOST Spectroscopic Survey

The Astronomical Journal
Spectroscopic observations of various tracers in nearby galaxies, such as Andromeda (M31), play a crucial role in identifying and classifying individual stellar populations and nebular objects, thereby enhancing our understanding of galactic composition,
Pinjian Chen, Bingqiu Chen, Xuan Fang, Haibo Yuan, Baisong Zhang, Xiangwei Zhang, Jiarui Sun, Xiaowei Liu   +7 more
doaj   +1 more source

Emission Line Spectroscopy of Large, Diffuse Planetary Nebulae

, 2005
Accurate emission line fluxes of planetary nebulae (PN) provide important constraints on the nature of the late stages of stellar evolution. Large (r > 10'), diffuse PN may trace the latest stages of PN evolution, where material from the AGB wind is ...
Frew, D, Madsen, G, Parker, Q, Reynolds, R, Haffner, L   +4 more
core  

Interacting planetary nebulae

, 2012
We discuss the classification and orientation of planetary nebulae that interact with the interstellar medium throughout the Milky Way. A sample of 117 confirmed interacting planetary nebulae is used for this purpose.
H. M. Basurah, A. Ali, L. Sabin, S. Snaid   +3 more
core   +1 more source

The evolution of planetary nebulae

, 2007
Context.The luminosity function of planetary nebulae, in use for about two decades in extragalactic distance determinations, is still subject to controversial interpretations.
R. Jacob, M. Steffen, D. Schönberner, C. Sandin   +3 more
core   +1 more source

A new population of planetary nebulae candidates towards the Galactic bulge

, 2013
We discuss discovery of a new population of up to 300 planetary nebulae (PNe) candidates captured serendipitously in deep [OIII] imaging of the Galactic Bulge taken with the Mosaic II wide-field CCD imager on the Cerro Tololo Inter-American Observatory's
Stenborg, TN, Parker, QA
core  

Emission-line central stars of planetary nebulae

, 2005
The temperatures of central stars of planetary nebulae (PNe) are compared with evolutionary tracks.
Acker, A., Gesicki, K., Zijlstra, A. A.; id_orcid   +2 more
core   +1 more source

Radio Continuum Observations of Southern Planetary Nebulae Candidates

, 1993
We report on radio continuum observations of unidentified IRAS point sources with far IR colors that are typical of planetary nebulae. These planetary nebulae candidates are located outside the Galactic bulge and observable from the southern hemisphere ...
G. C. Van De Steene, S. Ronald Pottasch, van de Steene, GCM, Pottasch, Ronald   +3 more
core   +1 more source

The planetary nebulae and H 

, 2016
Aims. The chemical behaviour of an ample sample of planetary nebulae (PNe) in NGC 6822 is analysed. Methods.
Miriam Peña, Jorge García-Rojas, Sheila Flores-Durán, Liliana Hernández-Martínez   +3 more
core   +1 more source

Generalized Te([O iii])–Te(He i) Discrepancies in Ionized Nebulae: Possible Evidence of Case B Deviations and Temperature Inhomogeneities

The Astrophysical Journal
The physics of recombination lines in the He i singlet system is expected to be relatively simple, supported by accurate atomic models. We examine the intensities of He i singlets λ 3614,  λ 3965,  λ 5016,  λ 6678, and  λ 7281 and the triplet He i λ 5876
J. E. Méndez-Delgado, E. D. Skillman, E. Aver, C. Morisset, C. Esteban, J. García-Rojas, K. Kreckel, N. S. J. Rogers, F. F. Rosales-Ortega, K. Z. Arellano-Córdova, S. R. Flury, E. Reyes-Rodríguez, M. Orte-García, S. Tan   +13 more
doaj   +1 more source

Identification Charts for Planetary Nebulae

Journal of Mathematical and Fundamental Sciences, 2019
. At Dr. L. Perek's request, identification charts for 12 known planetary nebulae, of which the locations were not certain, are given.   Ichtisar. Atas permintaan Dr. L. Perek, peta pengenal untuk 12 kabut planit jang letaknja diragukan, disadjikan dalam
Pik Sin The
doaj