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


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST22:26:46

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 - 2020
#notes
1 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2996 0
2 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 306 0
3 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 617 0
4 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 439 1
5 Cl* NGC 6656 MPF 3-225 HB* 18 35 31.962 -23 54 32.76   15.519 15.038   14.352 ~ 2 0
6 Cl* NGC 6656 MPF 3-163 HB* 18 35 38.9196995099 -23 58 45.348407399   15.106 14.696   14.111 ~ 2 0
7 Cl* NGC 6656 MPF 6-654 HB* 18 35 39.166 -24 09 59.41   16.622 16.475   16.267 ~ 2 0
8 2MASS J18354124-2355448 HB* 18 35 41.2541540804 -23 55 44.835476362   14.774 14.411   13.794 ~ 3 0
9 Cl* NGC 6656 MPF 6-926 HB* 18 35 43.04 -24 03 51.6   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 48.6838837291 -23 52 26.884293377   15.012 14.729   14.219 ~ 2 0
12 2MASS J18355084-2346306 HB* 18 35 50.8391580300 -23 46 30.629274204   14.756 14.409   13.809 ~ 2 0
13 2MASS J18355128-2351379 HB* 18 35 51.2730525921 -23 51 37.998513284   14.821 14.402   13.715 ~ 3 0
14 Cl* NGC 6656 SAW V125 HB* 18 35 57.4839499147 -23 47 59.191964818   14.779 14.448   13.966 ~ 4 0
15 2MASS J18360153-2351444 HB* 18 36 01.5259487383 -23 51 44.534958517   14.857 14.424   13.769 ~ 3 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 02.97 -23 50 29.6   14.586 14.055   13.244 ~ 5 0
18 2MASS J18360334-2354030 HB* 18 36 03.3550456870 -23 54 02.989369006   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 08.865 -23 54 49.81   15.372 15.143   14.707 ~ 2 0
21 NGC 6656 3054 HB* 18 36 09.8216523571 -23 55 13.483588696   14.724 14.320   13.705 ~ 6 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 Cl* NGC 6656 ALC 3006 HB* 18 36 10.7969667157 -23 49 57.151309346   13.024 12.580   11.896 ~ 11 0
24 Cl* NGC 6656 MPF 2-563 HB* 18 36 10.8559276099 -23 57 15.630707400   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 13.7979331201 -24 00 09.317099431   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 14.5512055544 -23 57 51.759517398   16.698 16.522   16.227 ~ 2 0
29 Cl* NGC 6656 MPF 2-4837 HB* 18 36 14.8598916515 -23 54 41.033512444   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 19.2599702464 -23 53 13.501288087   17.622 17.537   17.556 ~ 2 0
35 Cl* NGC 6656 MPF 2-6400 HB* 18 36 20.16 -23 50 23.0   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   7.16 6.17     ~ 1217 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 25.1588255861 -23 48 00.926473251   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 2MASS J18362935-2400288 HB* 18 36 29.3630488282 -24 00 28.857487299   14.627 14.233   13.639 ~ 3 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 2MASS J18363736-2359563 HB* 18 36 37.3701134115 -23 59 56.391307973   14.628 14.273   13.723 ~ 3 0
49 2MASS J18363819-2348195 HB* 18 36 38.2048785970 -23 48 19.660647602   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 40.473 -23 54 30.95   15.141 14.831   14.317 ~ 2 0
53 2MASS J18364442-2352530 HB* 18 36 44.4356246640 -23 52 53.171013466   14.888 14.554   14.084 ~ 3 0
54 Cl* NGC 6656 MPF 1-378 HB* 18 36 45.0192297880 -23 58 56.617708733   15.894 15.700   15.314 ~ 2 0
55 Cl* NGC 6656 SAN 9 HB* 18 36 45.0833930926 -24 06 02.984809595   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 2MASS J18364754-2358440 HB* 18 36 47.5413850383 -23 58 43.928205217   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 2MASS J18364925-2351148 HB* 18 36 49.2556255319 -23 51 15.022043429   15.408 15.105   14.684 ~ 2 0
60 2MASS J18364941-2346473 HB* 18 36 49.4181798610 -23 46 47.421356454   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 2MASS J18365173-2406213 HB* 18 36 51.7336833845 -24 06 21.361934830   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 52.998 -24 00 35.36   15.424 15.215   14.867 ~ 2 0
65 2MASS J18365398-2349306 HB* 18 36 53.9862213551 -23 49 30.754444653   14.721 14.331   13.769 ~ 2 0
66 2MASS J18365433-2353155 HB* 18 36 54.3392553435 -23 53 15.591107865   14.903 14.592   14.129 ~ 3 0
67 Cl* NGC 6656 MPF 1-404 HB* 18 36 55.711 -23 54 42.21   16.017 15.779   15.425 ~ 2 0
68 Cl* NGC 6656 MPF 1-73 HB* 18 36 55.73 -23 52 13.5   14.553 14.129   13.523 ~ 2 0
69 2MASS J18370258-2401413 HB* 18 37 02.5739186813 -24 01 41.305086518   15.018 14.774   14.377 ~ 2 0
70 2MASS J18370359-2346389 HB* 18 37 03.5967083259 -23 46 38.903893678   15.136 14.779   14.252 ~ 2 0
71 [GLS2014] 2 HB* 18 37 03.6114726178 -23 58 10.498259580   14.548 14.090   13.416 A 4 0
72 Cl* NGC 6656 MPF 1-1189 HB* 18 37 06.55 -23 53 50.6   17.203 17.049   16.862 ~ 2 0
73 2MASS J18371212-2357440 HB* 18 37 12.1203888215 -23 57 44.044717012   15.156 14.881   14.476 ~ 2 0
74 2MASS J18371364-2359156 HB* 18 37 13.6487830726 -23 59 15.678879159   15.715 15.474   15.128 ~ 2 0
75 2MASS J18371729-2404386 HB* 18 37 17.2832797375 -24 04 38.703352635   15.195 14.986   14.505 ~ 2 0
76 2MASS J18371782-2352317 HB* 18 37 17.8217346646 -23 52 31.679830751   14.799 14.428   13.909 ~ 4 0
77 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1806 0

    Equat.    Gal    SGal    Ecl

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2020.07.03-22:26:46

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