Zobrazeno 1 - 10
of 16
pro vyhledávání: '"K. B. Kwitter"'
Autor:
K. B. Kwitter, R. B. C. Henry
This paper summarizes a project designed to study abundances in a sample of planetary nebulae representing a broad range in progenitor mass and metallicity. We collect abundances of C, N, and O determined for the entire sample and compare them with t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c280ad5819e98970f5ade4232d767ad
https://doi.org/10.1142/9789812810830_0048
https://doi.org/10.1142/9789812810830_0048
Publikováno v:
Planetary Nebulae ISBN: 9780792324409
We have obtained deep CCD images of 14 PN to search for and examine faint halos. These images were obtained with Hβ, [OIII], Hα, and [NII] narrowband interference filters on the Burrell Schmidt at Kitt Peak. Table 1 summarizes the observations. We
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2be1d4d7a0d78648ca50f91ecac2519a
https://doi.org/10.1007/978-94-011-2088-3_81
https://doi.org/10.1007/978-94-011-2088-3_81
Publikováno v:
Symposium - International Astronomical Union. 180:236-236
We report on our project to re-evaluate carbon and other abundances in PNe spanning the expected PN progenitor mass range. The ultimate goal of this work is three-fold: (i) to determine the abundance of carbon in this sample; (ii) to assess the abund
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::36458dc221f6b465fca8abbffe1a4e7c
https://doi.org/10.1017/s0074180900130566
https://doi.org/10.1017/s0074180900130566
Autor:
R. W. Tweedy, K. B. Kwitter
Publikováno v:
The Astronomical Journal. 108:188
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be67fb8aeee814d5bb53f991c71bca47
https://doi.org/10.1086/117057
https://doi.org/10.1086/117057
Autor:
G. H. Jacoby, K. B. Kwitter
Publikováno v:
Planetary Nebulae ISBN: 9780792300038
As the first step toward assessing the high-mass end of the PNN (and hence, WD) mass distributions, we report here on new PNN found in extended, low surface brightness PN. Our ultimate goal is to obtain luminosities and temperatures for these stars a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c56f6342a5599111ece25ce5862c12ff
https://doi.org/10.1007/978-94-009-0865-9_109
https://doi.org/10.1007/978-94-009-0865-9_109
Publikováno v:
Planetary Nebulae ISBN: 9789027715586
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d18e7f6a49b961b24dc5a5e27b9dfa83
https://doi.org/10.1007/978-94-009-7094-6_77
https://doi.org/10.1007/978-94-009-7094-6_77
Publikováno v:
The Astrophysical Journal. 254:562
We have obtained narrwo-band filter photographs, (O III) lambda5007 Fabry-Perot line profiles and 21 cm maps of the cicinity of the Sharpless H II region S308 and adjacent nebulae. S308 is a ring nebula surrounding the WN5 star HD 50896. An expansion
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a60c32ca79289c0a71a471133a60fc18
https://doi.org/10.1086/159766
https://doi.org/10.1086/159766
Autor:
K. B. Kwitter, D. G. Lawrie
Publikováno v:
The Astrophysical Journal. 255:L29
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ca5cc6690ec36d995057a9638d90b58
https://doi.org/10.1086/183763
https://doi.org/10.1086/183763
Publikováno v:
Publications of the Astronomical Society of the Pacific. 95:732
Spectroscopy of the filamentary planetary nebula YM29 has been obtained and it is found that it is significantly enriched in nitrogen and helium, with N/O and He/H ratios roughly seven times and twice those found in Orion, respectively. Combined with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a2ed44ac0d50072a452a89a72e3b3835
https://doi.org/10.1086/131245
https://doi.org/10.1086/131245
Erratum - Identification of Faint Central Stars in Extended Low Surface Brightness Planetary Nebulae
Publikováno v:
The Astronomical Journal. 97:1248
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d531c3f1727099852f9800b6d0bf59b9
https://doi.org/10.1086/115069
https://doi.org/10.1086/115069