2004A&A...419.1123M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET11:25:37

2004A&A...419.1123M - Astronomy and Astrophysics, volume 419, 1123-1132 (2004/6-1)

High-resolution spectroscopy of globular cluster post-Asymptotic Giant Branch stars.

MOONEY C.J., ROLLESTON W.R.J., KEENAN F.P., DUFTON P.L., SMOKER J.V., RYANS R.S.I., ALLER L.H. and TRUNDLE C.

Abstract (from CDS):

We present model atmosphere analyses of high resolution Keck and VLT optical spectra for three evolved stars in globular clusters, viz. ZNG-1 in M10, ZNG-1 in M15 and ZNG-1 in NGC6712. The derived atmospheric parameters and chemical compositions confirm the programme stars to be in the post-Asymptotic Giant Branch (post-AGB) evolutionary phase. Differential abundance analyses reveal CNO abundance patterns in M10 ZNG-1, and possibly M15 ZNG-1, which suggest that both objects may have evolved off the AGB before the third dredge-up occurred. The abundance pattern of these stars is similar to the third class of optically, bright post-AGB objects discussed by van Winckel (1997A&A...319..561V). Furthermore, M10 ZNG-1 exhibits a large C underabundance (with Δ[C/O]~-1.6dex), typical of other hot post-AGB objects. Differential Δ[α/Fe] abundance ratios in both M10 ZNG-1 and NGC6712 ZNG-1 are found to be approximately 0.0dex, with the Fe abundance of the former being in disagreement with the cluster metallicity of M10. Given that the Fe absorption features in both M10 ZNG-1 and NGC6712 ZNG-1 are well observed and reliably modelled, we believe that these differential Fe abundance estimates to be secure. However, our Fe abundance is difficult to explain in terms of previous evolutionary processes that occur on both the Horizontal Branch and the AGB.

Abstract Copyright:

Journal keyword(s): Galaxy: globular clusters: individual: M 10, M 15, NGC 6712 - stars: early-type - stars: AGB and post-AGB - stars: abundances

VizieR on-line data: <Available at CDS (J/A+A/419/1123): table.dat table.tex>

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME [BM89] L1523 PoC 05 06 22.9 +31 41 19           ~ 45 0
2 * bet Ori s*b 05 14 32.27210 -08 12 05.8981 -0.56 0.10 0.13 0.13 0.15 B8Iae 733 0
3 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 302 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3073 0
5 2MASS J13272898-4722472 pA* 13 27 28.9892208098 -47 22 47.303424183   13.30 13.16     ~ 25 0
6 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1805 0
7 Cl* NGC 5904 MSB 1 AB* 15 18 34.117 +02 05 00.17   14.2150 12.2791   14.6608 ~ 26 4
8 BD+33 2642 pA* 15 51 59.8857490337 +32 56 54.327647794 9.806 10.61 10.73 10.884 10.961 O7p 385 0
9 2MASS J16413368+3626077 pA* 16 41 33.6665077140 +36 26 07.776880067   12.98 13.14     B2p 74 0
10 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2036 0
11 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 706 0
12 2MASS J16570924-0404243 pA* 16 57 09.2536661254 -04 04 24.404254575   13.19 13.23     B: 20 1
13 NGC 6397 162 HS* 17 40 38.4614296064 -53 38 31.346327354   13.06 13.23     sdOp 40 1
14 V* V4387 Sgr a2* 18 15 30.7645714197 -18 39 41.654326703 6.02 6.35 6.15 5.93 5.70 ApSi 62 0
15 NGC 6712 GlC 18 53 04.32 -08 42 21.5   9.85 8.69     ~ 475 0
16 2MASS J18530579-0842378 pA* 18 53 05.7912428698 -08 42 37.859199115   13.66 13.33     ~ 12 0
17 NGC 7078 559 * 21 29 58.23 +12 11 42.0   14.19 14.98     ~ 22 1
18 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2943 0

    Equat.    Gal    SGal    Ecl

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2021.03.03-11:25:37

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