2000A&A...355...69P


Query : 2000A&A...355...69P

2000A&A...355...69P - Astronomy and Astrophysics, volume 355, 69-78 (2000/3-1)

Measurements of 12C/13C in planetary nebulae: Implications on stellar and Galactic chemical evolution.

PALLA F., BACHILLER R., STANGHELLINI L., TOSI M. and GALLI D.

Abstract (from CDS):

We present the results of a study aimed at determining the 12C/13C ratio in two samples of planetary nebulae (PNe) by means of millimeter wave observations of 12CO and 13CO. The first group includes six PNe which have been observed in the 3He+ hyperfine transition by Balser et al. (1997ApJ...483..320B); the other group consists of 22 nebulae with rich molecular envelopes. We have determined the carbon isotopic ratio in 14 objects, 9 of which are new detections. The results indicate a range of values of 12C/13C between 9 and 23. We estimate the mass of the progenitors of the PNe of our sample and combine this information with the derived 12C/13C isotopic ratios to test the predictions of stellar nucleosynthesis models. We find that the majority of PNe have isotopic ratios below the values expected from current standard asymptotic giant branch models in the mass range of interest. We suggest that the progenitors of the PNe must have undergone a non-standard mixing process during their red giant phase and/or asymptotic giant phase, resulting in a significant enhancement of the 13C abundance in the surface layers. Our study confirms a similar behaviour inferred from spectroscopic observations of field population II stars and globular cluster giants, and extends it to the final stages of stellar evolution. Finally, we discuss the implications of our results on models of Galactic chemical evolution of 3He and 12C/13C.

Abstract Copyright:

Journal keyword(s): ISM: planetary nebulae: general - radio lines: ISM - Galaxy: evolution

CDS comments: tables 2 and 3: PN OH 09+1.3 not identified

Simbad objects: 24

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Number of rows : 24
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 LHA 115-N 2 PN 00 32 38.8692105240 -71 41 59.628264792   16.40       ~ 51 0
2 IC 289 PN 03 10 19.3015329024 +61 19 00.913523412   16.8       ~ 151 1
3 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 981 0
4 NGC 2346 PN 07 09 22.5215800440 -00 48 23.610997332   11.76 11.58     A5V 564 0
5 PN M 1-13 PN 07 21 15.037 -18 08 34.65   11.0       ~ 94 0
6 PN M 1-16 PN 07 37 18.902 -09 38 47.96   12.7       ~ 178 0
7 PN M 1-17 PN 07 40 22.1724359520 -11 32 29.783641164           ~ 98 0
8 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 850 1
9 NGC 3242 PN 10 24 46.1335521792 -18 38 32.296857792   11.83 12.15     ~ 811 1
10 PN M 2-9 PN 17 05 37.952 -10 08 34.58   12.59 14.7     Be 513 0
11 NGC 6543 PN 17 58 33.4039587288 +66 37 58.750734000   11.09 11.28     [WC] 1143 1
12 PN M 4-9 PN 18 14 18.41 -04 59 22.1     16.6     ~ 73 0
13 M 57 PN 18 53 35.0967659112 +33 01 44.883287544   15.405 15.769 15.901 16.062 DA(O?) 814 2
14 NGC 6781 PN 19 18 28.085 +06 32 19.29     11.8     ~ 257 0
15 HD 184738 PN 19 34 45.2337620448 +30 30 58.950651240   10.41 10.44     [WC9] 932 0
16 M 27 PN 19 59 36.3631850088 +22 43 16.312059552   13.749 14.089 14.247 14.405 DAO.6 579 0
17 NGC 7008 PN 21 00 32.817600 +54 32 35.37600       13.21   ~ 237 2
18 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 853 1
19 NGC 7009 PN 21 04 10.8155187648 -11 21 48.580157556   12.48 12.07     ~ 979 1
20 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2401 1
21 IC 5117 PN 21 32 30.97 +44 35 47.5     16.7     ~ 293 0
22 PN M 2-51 PN 22 16 03.890 +57 28 33.75           ~ 79 0
23 NGC 7293 PN 22 29 38.5454047152 -20 50 13.747242408 11.894 13.158 13.524 13.689 13.898 DAO.5 925 0
24 NGC 7662 PN 23 25 53.6 +42 32 06   9.4 12     ~ 919 0

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2022.05.24-07:38:28

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