2013A&A...559A.101S


Query : 2013A&A...559A.101S

2013A&A...559A.101S - Astronomy and Astrophysics, volume 559A, 101-101 (2013/11-1)

Spectroscopy of blue horizontal branch stars in NGC 6656 (M22).

SALGADO C., MONI BIDIN C., VILLANOVA S., GEISLER D. and CATELAN M.

Abstract (from CDS):

Recent investigations revealed very peculiar properties of blue horizontal branch (HB) stars in ω Centauri, which show anomalously low surface gravity and mass compared to other clusters and to theoretical models. ω Centauri, however, is a very unusual object, hosting a complex mix of multiple stellar populations with different metallicity and chemical abundances. We measured the fundamental parameters (temperature, gravity, and surface helium abundance) of a sample of 71 blue HB stars in M22, with the aim of clarifying if the peculiar results found in ω Cen are unique to this cluster. M22 also hosts multiple sub-populations of stars with a spread in metallicity, analogous to ω Cen. The stellar parameters were measured on low-resolution spectra fitting the Balmer and helium lines with a grid of synthetic spectra. From these parameters, the mass and reddening were estimated. Our results on the gravities and masses agree well with theoretical expectations, matching the previous measurements in three ``normal'' clusters. The anomalies found in ω Cen are not observed among our stars. A mild mass underestimate is found for stars hotter than 14000 K, but an exact analogy with ω Cen cannot be drawn. We measured the reddening in the direction of M22 with two independent methods, finding E(B-V)=0.35±0.02mag, with semi-amplitude of the maximum variation Δ(E(B-V))=0.06mag, and an rms intrinsic dispersion of σ(E(B-V))=0.03mag.

Abstract Copyright:

Journal keyword(s): stars: horizontal-branch - stars: atmospheres - stars: fundamental parameters - stars: abundances - clusters: globular: individual: NGC6656

VizieR on-line data: <Available at CDS (J/A+A/559/A101): table1.dat sp/*>

Simbad objects: 77

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Number of rows : 77
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 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3299 0
2 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 347 0
3 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 683 0
4 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 469 0
5 Cl* NGC 6656 MPF 3-225 HB* 18 35 31.9648216224 -23 54 32.808753972   15.519 15.038   14.352 ~ 2 0
6 Cl* NGC 6656 MPF 3-163 HB* 18 35 38.9197228896 -23 58 45.348697056   15.106 14.696   14.111 ~ 2 0
7 Cl* NGC 6656 MPF 6-654 HB* 18 35 39.1514836872 -24 09 59.129471304   16.622 16.475   16.267 ~ 2 0
8 Cl* NGC 6656 MPF 3-114 HB* 18 35 41.2541876160 -23 55 44.835783600   14.774 14.411   13.794 ~ 3 0
9 Cl* NGC 6656 MPF 6-926 HB* 18 35 43.0641398904 -24 03 51.956049708   17.138 16.895   16.396 ~ 2 0
10 Cl* NGC 6656 MPF 3-71 HB* 18 35 43.689 -23 53 16.36   14.435 14.053   13.405 ~ 2 0
11 Cl* NGC 6656 MPF 3-169 HB* 18 35 48.6838393248 -23 52 26.885553816   15.012 14.729   14.219 ~ 2 0
12 Cl* NGC 6656 MPF 3-113 HB* 18 35 50.8390108800 -23 46 30.629203608   14.756 14.409   13.809 ~ 2 0
13 Cl* NGC 6656 MPF 3-111 HB* 18 35 51.2730963120 -23 51 37.999322244   14.821 14.402   13.715 ~ 4 0
14 Cl* NGC 6656 SAW V125 HB* 18 35 57.4839499147 -23 47 59.191964818   14.779 14.448   13.966 ~ 5 0
15 Cl* NGC 6656 MPF 3-118 HB* 18 36 01.5260289960 -23 51 44.532681048   14.857 14.424   13.769 ~ 4 0
16 Cl* NGC 6656 MPF 3-949 HB* 18 36 01.9595324058 -23 55 08.237646305   16.872 16.663   16.299 ~ 2 0
17 OGLE BLG566.10 100119 RR* 18 36 02.9630347296 -23 50 29.614321248   14.586 14.055   13.244 ~ 6 0
18 Cl* NGC 6656 MPF 3-270 HB* 18 36 03.3550450704 -23 54 02.992347072   15.513 15.292   14.879 ~ 2 0
19 Cl* NGC 6656 MPF 2-2127 HB* 18 36 07.27 -23 52 19.7   16.333 16.107   15.677 ~ 2 0
20 Cl* NGC 6656 MPF 2-1111 HB* 18 36 08.8769449296 -23 54 49.587028056   15.372 15.143   14.707 ~ 2 0
21 NGC 6656 3054 HB* 18 36 09.8216401392 -23 55 13.483199892   14.724 14.320   13.705 ~ 7 0
22 Cl* NGC 6656 MPF 2-5018 HB* 18 36 10.09 -23 58 51.2   17.351 17.262   17.041 ~ 2 0
23 NGC 6656 2103 HB* 18 36 10.7969316168 -23 49 57.149616576   13.024 12.580   11.896 ~ 11 0
24 Cl* NGC 6656 MPF 2-563 HB* 18 36 10.8557922936 -23 57 15.630360480   14.724 14.374   13.786 ~ 2 0
25 Cl* NGC 6656 MPF 2-3357 HB* 18 36 13.13 -23 57 21.7   17.004 16.815   16.704 ~ 2 0
26 Cl* NGC 6656 MPF 2-8090 HB* 18 36 13.7978092752 -24 00 09.315627048   17.890 17.743   17.445 ~ 2 0
27 Cl* NGC 6656 MPF 2-8175 HB* 18 36 14.04 -23 55 27.6   18.124 17.832   16.451 ~ 2 0
28 Cl* NGC 6656 MPF 2-2804 HB* 18 36 14.5512438408 -23 57 51.761532204   16.698 16.522   16.227 ~ 2 0
29 Cl* NGC 6656 MPF 2-4837 HB* 18 36 14.8601804664 -23 54 41.024144448   17.375 17.207   16.878 ~ 2 0
30 Cl* NGC 6656 MPF 2-4213 HB* 18 36 15.38 -23 53 15.9   17.171 17.088   16.868 ~ 2 0
31 Cl* NGC 6656 MPF 2-2752 HB* 18 36 18.09 -23 55 34.2   16.677 16.500   16.192 ~ 2 0
32 Cl* NGC 6656 MPF 2-936 HB* 18 36 18.59 -23 53 50.0   15.196 14.893   14.423 ~ 2 0
33 Cl* NGC 6656 MPF 2-3509 HB* 18 36 18.63 -23 47 46.0   17.139 16.863   16.672 ~ 2 0
34 Cl* NGC 6656 MPF 2-6777 HB* 18 36 19.2575548488 -23 53 13.482588624   17.622 17.537   17.556 ~ 2 0
35 Cl* NGC 6656 MPF 2-6400 HB* 18 36 20.1704074920 -23 50 23.319289032   17.613 17.496   17.316 ~ 2 0
36 Cl* NGC 6656 MPF 2-4891 HB* 18 36 21.24 -23 46 57.5   17.351 17.230   17.056 ~ 2 0
37 Cl* NGC 6656 MPF 2-4766 HB* 18 36 21.41 -23 55 43.3   17.366 17.175   17.105 ~ 2 0
38 Cl* NGC 6656 MPF 2-3461 HB* 18 36 23.59 -23 55 12.8   17.071 16.846   16.546 ~ 2 0
39 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1320 0
40 Cl* NGC 6656 MPF 2-2427 HB* 18 36 24.30 -23 56 58.9   16.547 16.292   15.900 ~ 2 0
41 Cl* NGC 6656 MPF 2-9272 HB* 18 36 25.1578062408 -23 48 00.925924104   18.087 17.903   17.673 ~ 2 0
42 Cl* NGC 6656 MPF 2-3338 HB* 18 36 26.54 -23 56 27.9   16.903 16.815   16.678 ~ 2 0
43 Cl* NGC 6656 MPF 2-2160 HB* 18 36 28.35 -23 52 35.8   16.205 16.148   16.001 ~ 2 0
44 Cl* NGC 6656 MPF 2-476 HB* 18 36 29.3631893472 -24 00 28.858590360   14.627 14.233   13.639 ~ 4 0
45 Cl* NGC 6656 MPF 2-6658 HB* 18 36 29.69 -23 55 36.2   17.587 17.544   17.328 ~ 2 0
46 Cl* NGC 6656 MPF 2-5785 HB* 18 36 31.85 -23 52 11.3   17.624 17.495   16.286 ~ 2 0
47 Cl* NGC 6656 MPF 2-5588 HB* 18 36 34.45 -23 53 36.1   17.452 17.355   17.179 ~ 2 0
48 Cl* NGC 6656 MPF 2-495 HB* 18 36 37.3700993448 -23 59 56.391685116   14.628 14.273   13.723 ~ 3 0
49 Cl* NGC 6656 MPF 2-587 HB* 18 36 38.2045694424 -23 48 19.663658316   14.816 14.392   13.779 ~ 3 0
50 Cl* NGC 6656 MPF 2-6830 HB* 18 36 39.30 -23 50 24.4   17.637 17.565   17.363 ~ 2 0
51 Cl* NGC 6656 MPF 2-7157 HB* 18 36 40.16 -23 56 22.8   17.753 17.612   17.426 ~ 2 0
52 Cl* NGC 6656 MPF 2-897 HB* 18 36 40.4872553256 -23 54 31.011547644   15.141 14.831   14.317 ~ 2 0
53 Cl* NGC 6656 MPF 1-117 HB* 18 36 44.4355488936 -23 52 53.171107032   14.888 14.554   14.084 ~ 3 0
54 Cl* NGC 6656 MPF 1-378 HB* 18 36 45.0192013632 -23 58 56.617547412   15.894 15.700   15.314 ~ 2 0
55 Cl* NGC 6656 SAN 9 HB* 18 36 45.0832939032 -24 06 02.985843096   14.646 14.286   13.641 ~ 3 0
56 Cl* NGC 6656 MPF 1-498 HB* 18 36 46.218 -23 55 23.78   16.320 16.042   15.720 ~ 2 0
57 Cl* NGC 6656 MPF 1-429 HB* 18 36 47.5412178744 -23 58 43.927759488   16.126 15.861   15.524 ~ 2 0
58 Cl* NGC 6656 MPF 1-1175 HB* 18 36 49.09 -23 53 06.4   17.233 17.035   16.780 ~ 2 0
59 Cl* NGC 6656 MPF 1-200 HB* 18 36 49.2554588304 -23 51 15.022061820   15.408 15.105   14.684 ~ 2 0
60 Cl* NGC 6656 MPF 1-211 HB* 18 36 49.4180818656 -23 46 47.421932772   15.525 15.172   14.691 ~ 2 0
61 Cl* NGC 6656 MPF 1-2131 HB* 18 36 50.59 -23 58 14.8   17.852 17.726   17.546 ~ 2 0
62 Cl* NGC 6656 MPF 8-82 HB* 18 36 51.7336289304 -24 06 21.363083136   15.012 14.599   13.907 ~ 2 0
63 Cl* NGC 6656 MPF 1-961 HB* 18 36 51.91 -23 56 35.5   17.001 16.780   16.493 ~ 2 0
64 Cl* NGC 6656 MPF 1-217 HB* 18 36 52.9914200640 -24 00 35.494159464   15.424 15.215   14.867 ~ 2 0
65 Cl* NGC 6656 MPF 1-89 HB* 18 36 53.9861347920 -23 49 30.754239456   14.721 14.331   13.769 ~ 2 0
66 Cl* NGC 6656 MPF 1-121 HB* 18 36 54.3392452296 -23 53 15.590831100   14.903 14.592   14.129 ~ 3 0
67 Cl* NGC 6656 MPF 1-404 HB* 18 36 55.7281106688 -23 54 42.304168368   16.017 15.779   15.425 ~ 2 0
68 Cl* NGC 6656 MPF 1-73 HB* 18 36 55.7443550040 -23 52 13.625293728   14.553 14.129   13.523 ~ 2 0
69 Cl* NGC 6656 MPF 1-146 HB* 18 37 02.5739151576 -24 01 41.305420272   15.018 14.774   14.377 ~ 2 0
70 Cl* NGC 6656 MPF 1-147 HB* 18 37 03.5966562336 -23 46 38.903941272   15.136 14.779   14.252 ~ 2 0
71 Cl* NGC 6656 PG 22 HB* 18 37 03.6114091272 -23 58 10.496851320   14.548 14.090   13.416 A 4 0
72 Cl* NGC 6656 MPF 1-1189 HB* 18 37 06.5646533016 -23 53 50.783941176   17.203 17.049   16.862 ~ 2 0
73 Cl* NGC 6656 MPF 1-158 HB* 18 37 12.1203012024 -23 57 44.042654988   15.156 14.881   14.476 ~ 2 0
74 Cl* NGC 6656 MPF 1-294 HB* 18 37 13.6486068696 -23 59 15.676910808   15.715 15.474   15.128 ~ 2 0
75 Cl* NGC 6656 MPF 8-122 HB* 18 37 17.2831321512 -24 04 38.703904320   15.195 14.986   14.505 ~ 2 0
76 Cl* NGC 6656 SAN 12 HB* 18 37 17.8216705224 -23 52 31.680805872   14.799 14.428   13.909 ~ 4 0
77 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 1927 0

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2023.01.31-01:29:53

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