2009A&A...496..139G


Query : 2009A&A...496..139G

2009A&A...496..139G - Astronomy and Astrophysics, volume 496, 139-152 (2009/3-2)

Faint recombination lines in galactic PNe with a [WC] nucleus.

GARCIA-ROJAS J., PENA M. and PEIMBERT A.

Abstract (from CDS):

We present spatially resolved high-resolution spectrophotometric data for the planetary nebulae PB8, NGC 2867, and PB6. We have analyzed two knots in NGC 2867 and PB6 and one in PB8. The three nebulae are ionized by [WC] type nuclei: early [WO] for PB6 and NGC2867 and [WC5-6] in the case of PB8. Our aim is to study the behavior of the abundance discrepancy problem (ADF) in this type of planetary nebula. We measured a large number of optical recombination (ORL) and collisionally excited lines (CEL), from different ionization stages (many more than in any previous work), thus, we were able to derive physical conditions from many different diagnostic procedures. We determined ionic abundances from the available collisionally excited and recombination lines. Based on both sets of ionic abundances, we derived total chemical abundances in the nebulae using suitable ionization correction factors. From CELs, we have found abundances typical of Galactic disk planetary nebulae. Moderate ADF(O++) were found for PB 8 (2.57) and NGC 2867 (1.63). For NGC 2867, abundances from ORLs are higher but still consistent with Galactic disk planetary nebulae. On the contrary, PB 8 presents a very high O/H ratio from ORLs. A high C/O was obtained from ORLs for NGC 2867; this ratio is similar to C/O obtained from CELs and with the chemical composition of the wind of the central star, indicating that there was no further C-enrichment in the star, relative to O, after the nebular material ejection. On the contrary, we found C/O<1 in PB 8. Interestingly, we obtain (C/O)ORLs/(C/O)CELs<1 in PB 8 and NGC 2867; this added to the similarity between the heliocentric velocities measured in [O III] and O II lines for our three objects argue against the presence of H-deficient metal-rich knots coming from a late thermal pulse event.

Abstract Copyright:

Journal keyword(s): planetary nebulae: general - ISM: abundances - stars: Wolf-Rayet - planetary nebulae: individual: PB6 - planetary nebulae: individual: NGC 2867 - planetary nebulae: individual: PB8

Simbad objects: 20

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Number of rows : 20
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 NGC 40 PN 00 13 01.0170097248 +72 31 19.033338720   11.63 11.46     [WC8] 601 2
2 IC 2003 PN 03 56 21.9884187048 +33 52 30.759977028   13.11 11.87 13.44   [WC3?] 249 0
3 NGC 1501 PN 04 06 59.3920909320 +60 55 14.278542024   15.17 13.0     [WO4] 288 1
4 M 42 HII 05 35 17.3 -05 23 28           ~ 3900 0
5 HD 49798 HXB 06 48 04.7001531360 -44 18 58.436036028 6.758 8.017 8.287 8.391 8.543 sdO6 301 0
6 PN A66 30 PN 08 46 53.4639874872 +17 52 46.369394580   14.23 14.30 13.47   [WC5] 400 0
7 NGC 2867 PN 09 21 25.3832468160 -58 18 40.626683604   12.0 10.30     [WO2] 295 0
8 PN PB 6 PN 10 13 15.9622567176 -50 19 59.563979688   17.4 17.6     [WO1] 130 0
9 PN PB 8 PN 11 33 17.8152363912 -57 06 14.925910860     14.00     [WC5/6] 111 0
10 * tet Crt PM* 11 36 40.9133537 -09 48 08.091238   4.604 4.673     B9.5V 204 0
11 NGC 5315 PN 13 53 56.9726795664 -66 30 50.859483264   14.58 14.40     [WO4] 299 0
12 * 108 Vir * 14 45 30.2044637184 +00 43 02.180202816   5.656 5.665     B9.5V 149 0
13 NGC 6153 PN 16 31 30.5708444544 -40 15 12.646208700   10.7 15.55     ~ 296 0
14 PN M 1-42 PN 18 11 04.99 -28 58 59.1   13.1 14.00     ~ 200 0
15 PN M 2-36 EB* 18 17 41.43 -29 08 19.9   12.8 13.40   17.012 ~ 131 0
16 PN Hf 2-2 PN 18 32 30.9015918072 -28 43 20.276106312     15.90     ~ 90 0
17 PN A66 56 PN 19 13 06.129 +02 52 47.90           ~ 25 0
18 PN A66 58 PN 19 18 20.476 +01 46 59.62           [WC4] 301 0
19 PN A66 78 PN 21 35 29.3816259120 +31 41 45.449196108   13.04 13.25     [WC5] 316 0
20 NAME A78 Knot ? ~ ~           ~ 2 1

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2022.05.20-23:53:07

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