SPECTROPHOTOMETRY OF PLANETARY-NEBULAE .3. IIDS OBSERVATIONS OF COMPACT NEBULAE

Citation
Jb. Kaler et al., SPECTROPHOTOMETRY OF PLANETARY-NEBULAE .3. IIDS OBSERVATIONS OF COMPACT NEBULAE, Publications of the Astronomical Society of the Pacific, 108(729), 1996, pp. 980-985
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
ISSN journal
0004-6280 → ACNP
Volume
108
Issue
729
Year of publication
1996
Pages
980 - 985
Database
ISI
SICI code
0004-6280(1996)108:729<980:SOP.IO>2.0.ZU;2-I
Abstract
We give spectral line intensities, electron temperatures, electron den sities, and chemical compositions for 25 compact planetary nebulae obs erved with the IIDS at Kitt Peak. Several (Ha 3-75, He 2-15, K 3-89, M 1-16, M 2-52, and M 3-28) are found to be especially rich in helium a nd/or nitrogen (He/H>0.15; N/O>1). The results minimally confirm the c orrelation between N/O and He/H, but also confirm the intrinsic scatte r in the relation, as N-rich nebulae can be unenriched in He and vice versa.