2008A&A...490..715P


Query : 2008A&A...490..715P

2008A&A...490..715P - Astronomy and Astrophysics, volume 490, 715-724 (2008/11-1)

Abundances of planetary nebulae NGC3242 and NGC6369.

POTTASCH S.R. and BERNARD-SALAS J.

Abstract (from CDS):

The spectra of the planetary nebulae NGC3242 and NGC6369 are reanalysed using spectral measurements made in the mid-infrared with the Spitzer Space Telescope and the Infrared Space Observatory (ISO). The aim is to determine the chemical composition of these objects. We also make use of International Ultraviolet Explorer (IUE) and ground based spectra. These elliptical PNe are interesting because they are well-studied, nearby, bright objects and therefore allow a reasonably complete comparison of this type of nebulae. Abundances determined from the mid-infrared lines, which are insensitive to electron temperature, are used as the basis for the determination of the composition, which are found to differ somewhat from earlier results. The abundances found, especially the low value of helium and oxygen, indicate that the central star was originally of rather low mass. The abundance of phosphorus has been determined for the first time in NGC3242. The electron temperature in both of these nebulae is roughly constant unlike NGC6302 and NGC2392 where a strong temperature gradient is found. The temperature of the central star is discussed for both nebulae. Finally a comparison of the element abundances in these nebulae with the solar abundance is made. The low abundance of Fe and P is noted and it is suggested that these elements are an important constituent of the nebular dust.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: planetary nebulae: individual: NGC3242, NGC6369 - infrared: ISM

CDS comments: Paragraph. 4.3 NGC 6396 is a probable misprint for NGC 6369.

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 IC 418 PN 05 27 28.2059533560 -12 41 50.282287764   9.405 9.010 10.118   O7fp 1018 2
2 NGC 2022 PN 05 42 06.1904253312 +09 05 10.585995576   14.9 14.2     [WC] 355 0
3 NGC 2392 PN 07 29 10.7671398096 +20 54 42.474888072     9.68     O6f 711 1
4 NGC 3242 PN 10 24 46.1335521792 -18 38 32.296857792   11.83 12.15     ~ 812 1
5 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 773 1
6 NGC 6369 PN 17 29 20.4566510904 -23 45 34.771819248   16.6 12.00     [WC4] 311 0
7 NGC 6826 PN 19 44 48.1500225888 +50 31 30.249034932   10.21 9.6     O6fp 713 0
8 NGC 7662 PN 23 25 53.6 +42 32 06   9.4 12     ~ 920 0

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2022.07.02-19:41:50

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