Results 101 to 110 of about 4,999 (221)

Third-dredge-up oxygen in planetary nebulae

, 2000
The planetary nebulae He 2-436 and Wray 16-423 in the Sagittarius dwarf galaxy appear to result from nearly twin stars, except that third-dredge-up carbon is more abundant in He 2-436. A thorough photoionization-model analysis implies that ratios Ne/O, S/
Dudziak, G., Zijlstra, A.A., Walsh, J.R., Pequignot, D.   +3 more
core  

Photometric observations of the binary nuclei of three Abell planetary nebulae

, 2004
Meeting on Asymmetrical Planetary Nebulae III -- JUL 28-AUG 01, 2003 -- Mt Rainier, WACCD photometric observations of the three Abell planetary nebulae (Abell 63, Abell 46 and Abell 41) nuclei are presented.
Afsar, M, Ibanoglu, C
core  

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  

New Planetary Nebulae and Candidates from Multicolour Multiwavelength Surveys

, 2013
In the past decade, the Deep Sky Hunters Collaboration has identified more than 200 planetary nebula (PN) candidates by scanning the Digitized Sky Survey (DSS) and other publicly available digital resources (SDSS, GALEX, WISE) mostly outside the sky ...
Kronberger, M, Jacoby, GH, Frew, DJ, Sabin, L, Parker, QA, Alves, F, Goldman, D, Harmer, D, Zoll, S, Guillem, P, Acker, A, Mulato, L, Patchick, D, Lilge, S   +13 more
core  

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

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

MILAN Sky Survey, a dataset of raw deep sky images captured during one year with a Stellina automated telescope. [PDF]

Data Brief, 2023
Parisot O, Hitzelberger P, Bruneau P, Krebs G, Destruel C, Vandame B.   +5 more
europepmc   +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

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  

The 3D structure of the Ring nebula

, 2009
The Ring nebula (M57) is one of the closest and best observed planetary nebulae. Still, its structure remains controversial. Based on detailed spectroscopic observations of the kinematics we present a solution generated with SHAPE to the 3D structure of ...
Steffen, W, Morisset, C, López, JA, Koning, N, Kwok, S, Riesgo, H, Richer, MG   +6 more
core