2012A&A...543A..11M


Query : 2012A&A...543A..11M

2012A&A...543A..11M - Astronomy and Astrophysics, volume 543A, 11-11 (2012/7-1)

Chemical abundances of hot post-AGB stars.

MELLO D.R.C., DAFLON S., PEREIRA C.B. and HUBENY I.

Abstract (from CDS):

Hot post-AGB stars are luminous objects of low- and intermediate mass (0.8-8 M) in the final stage of evolution, moving between the asymptotic giant branch (AGB) stars and planetary nebulae. The absorption lines observed in their spectra are typical of early-type stars and their abundance pattern may be associated with the occurence of one or more mixing processes during the previous AGB phase. To better constrain their observed chemical pattern and evolutionary status, we determined chemical abundances for a sample of hot post-AGB stars selected according to spectroscopic criteria. The observational data are high-resolution spectra obtained with the FEROS spectrograph. The stellar parameters and chemical composition were obtained from fully consistent non-LTE synthesis. The general abundance pattern reveals relevant nitrogen enrichment, slight depletion in carbon and sulfur and mild excess in helium for most of the objects. One notable exception is LSE 148, with Z=0.001, which is likely to be a metal-poor object at high galactic latitude. The atmospheric parameters and chemical abundances obtained are discussed in the context of evolutionary models. Mixing processes like the second/third dredged-up and ``hot bottom-burning'' are invoked to explain the obtained results.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: atmospheres - stars: evolution - stars: fundamental parameters - stars: early-type

Simbad objects: 23

goto Full paper

goto View the references in ADS

Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6562 1
2 CD-45 5058 HS* 09 20 10.1317907208 -45 31 54.942917700 9.81 11.03 11.33 11.62   sdO 53 0
3 Mrk 116 PaG 09 34 02.1 +55 14 25           ~ 1074 1
4 PG 1323-086 HS* 13 25 39.4669501176 -08 49 19.067387484 12.660 13.341 13.481 13.529 13.608 sdB3IHe8 138 1
5 CD-55 5174 pA* 13 29 51.0242883000 -56 06 53.729362548 10.33 11.07 10.77 10.68   B1Iae 35 0
6 CPD-64 2939 pA* 14 37 10.1041903776 -64 48 04.635110160 11.13 11.55 10.97 10.86   B3Ie 45 0
7 BD-18 4436 pA* 17 10 24.1453877400 -18 49 00.649851744   11.96 11.46     B5Ibe 29 0
8 CD-59 6479 Be* 17 16 21.08 -59 29 23.3 10.03 10.73 10.75     B3e 126 0
9 LS IV -15 3 pA* 17 23 11.9082133464 -15 37 15.108664584   12.40 12.01     B1IIIpe 26 0
10 CD-49 11554 pA* 17 35 02.4970127232 -49 26 26.379787848 10.57 11.14 10.74     B1Iae 56 0
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13449 0
12 HD 161853 ** 17 49 16.5582018192 -31 15 18.068754204 7.48 8.11 7.97 8.81   O8V(n)z+B 73 2
13 V* V4334 Sgr CV* 17 52 32.69352 -17 41 08.0160           F2Ia 361 0
14 HD 162495 * 17 52 45.6854189712 -33 50 40.422114600   10.34 9.13     K1/2(III) 6 0
15 CD-34 12448 s*b 18 05 38.2817927376 -34 09 30.237873192 11.7 13.18 12.83 12.36   B9Ia+e 22 0
16 HD 341617 pA* 18 08 20.0857525920 +24 10 43.321447236   11.41 11.39     B1IIIe 84 0
17 LSE 63 pA* 18 40 22.0184404776 -31 56 48.812592804   12.09 11.97 12.05 11.77 B1Iabe 20 0
18 HD 177566 pA* 19 07 07.8863699904 -41 43 16.014829872 9 9.97 10.17     B5/7Ib 44 0
19 PN A66 58 PN 19 18 20.476 +01 46 59.62           [WC4] 311 0
20 BD-13 5550 pA* 20 01 49.8291561312 -12 41 17.767855176 10.62 11.3 11.4     B1Ibe 73 0
21 Hen 1-5 pA* 20 11 56.0595568008 +20 20 04.420944132 11.41 10.66 9.45     G8/K0Iae 502 0
22 LS II +34 26 PN 20 48 16.6321353648 +34 27 24.344529588 10.48 11.11 10.9     B1.5Ia/Iabe 70 0
23 PHL 174 pA* 21 50 48.6549802320 -19 42 00.316659096 12.78 13.82 13.97     B3 16 0

To bookmark this query, right click on this link: simbad:objects in 2012A&A...543A..11M and select 'bookmark this link' or equivalent in the popup menu


2023.02.02-19:23:05

© Université de Strasbourg/CNRS

    • Contact