TY - JOUR
T1 - Spectrophotometry of planetary nebulae. III. IIDS observations of compact nebulae
AU - Kaler, James B.
AU - Kwitter, Karen B.
AU - Shaw, Richard A.
AU - Browning, Louise
PY - 1996/11
Y1 - 1996/11
N2 - We give spectral line intensities, electron temperatures, electron densities, and chemical compositions for 25 compact planetary nebulae observed 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 and/or nitrogen (He/H>0.15; N/O>1). The results minimally confirm the correlation between N/O and He/H, but also confirm the intrinsic scatter in the relation, as N-rich nebulae can be unenriched in He and vice versa.
AB - We give spectral line intensities, electron temperatures, electron densities, and chemical compositions for 25 compact planetary nebulae observed 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 and/or nitrogen (He/H>0.15; N/O>1). The results minimally confirm the correlation between N/O and He/H, but also confirm the intrinsic scatter in the relation, as N-rich nebulae can be unenriched in He and vice versa.
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U2 - 10.1086/133823
DO - 10.1086/133823
M3 - Article
AN - SCOPUS:0030502016
SN - 0004-6280
VL - 108
SP - 980
EP - 985
JO - Publications of the Astronomical Society of the Pacific
JF - Publications of the Astronomical Society of the Pacific
IS - 729
ER -