2006MNRAS.368.1749T

Query : 2006MNRAS.368.1749T

2006MNRAS.368.1749T - Mon. Not. R. Astron. Soc., 368, 1749-1756 (2006/June-1)

A non-LTE abundance analysis of the post-AGB star ROA5701.

THOMPSON H.M.A., KEENAN F.P., DUFTON P.L., RYANS R.S.I. and SMOKER J.V.

Abstract (from CDS):

An analysis of high-resolution Anglo-Australian Telescope (AAT)/University College London Échelle Spectrograph (UCLÉS) optical spectra for the ultraviolet (UV)-bright star ROA5701 in the globular cluster ω Cen (NGC5139) is performed, using non-local thermodynamic equilibrium (non-LTE) model atmospheres to estimate stellar atmospheric parameters and chemical composition. Abundances are derived for C, N, O, Mg, Si and S, and compared with those found previously by Moehler et al. We find a general metal underabundance relative to young B-type stars, consistent with the average metallicity of the cluster. Our results indicate that ROA5701 has not undergone a gas-dust separation scenario as previously suggested. However, its abundance pattern does imply that ROA5701 has evolved off the asymptotic giant branch (AGB) prior to the onset of the third dredge-up.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: early-type - stars: individual: Cl* NGC 5139 WOR 1957 - globular clusters: individual: NGC5139

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 - 2026 		#notes
1 * gam Peg bC* 00 13 14.1523490172 +15 11 00.954346538 1.75 2.61 2.84 2.94 3.13 B2IV 720 0
2 V* V382 Aur pA* 06 37 52.4269199856 +53 31 01.958446992   9.585 9.295 9.078   F7IV: 138 0
3 HD 56126 pA* 07 16 10.2590823192 +09 59 47.954735376   9.20 8.32     F0/5Ia 330 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
5 2MASS J13272898-4722472 pA* 13 27 28.9893774528 -47 22 47.300102004   13.30 13.16     ~ 30 0
6 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
7 Cl* NGC 5986 ABO 6 * 15 46 03.38 -37 46 43.4   12.955 12.652     ~ 7 0
8 2MASS J16413368+3626077 pA* 16 41 33.6668708904 +36 26 07.783784952   12.98 13.14     B2p 79 0
9 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
10 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
11 2MASS J16570924-0404243 pA* 16 57 09.2537275440 -04 04 24.404262132   13.19 13.23     B: 26 1
12 V* V453 Oph RV* 17 26 49.1293769256 -02 23 36.431892240   11.7 10.85     A5 62 0
13 V* V340 Ser RV* 17 30 46.9248358536 -11 22 08.313569004   10.51 9.68     F2/3II 41 0
14 HD 341617 pA* 18 08 20.0857525920 +24 10 43.321447236   11.41 11.39     B1IIIe 92 0
15 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
16 PN K 1-16 PN 18 21 52.1086837968 +64 21 53.406292104   14.44 14.96 15.26   PG1159 258 0
17 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
18 PN Ps 1 PN 21 29 59.3972661392 +12 10 26.275343735   13.39 14.06     sdO 295 0
19 PHL 1580 pA* 21 30 25.2464619192 -19 22 34.487878404     12.330     ~ 21 0
20 PHL 174 pA* 21 50 48.6549802320 -19 42 00.316659096 12.78 13.82 13.97     B3 18 0

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