2006A&A...451..499M

Query : 2006A&A...451..499M

2006A&A...451..499M - Astronomy and Astrophysics, volume 451, 499-513 (2006/5-4)

The lack of close binaries among hot horizontal branch stars in NGC 6752.

MONI BIDIN C., MOEHLER S., PIOTTO G., RECIO-BLANCO A., MOMANY Y. and MENDEZ R.A.

Abstract (from CDS):

We present the results of a spectroscopic search for close binaries among horizontal branch (HB) stars in NGC 6752. We used the ESO VLT-FORS2 instrument to obtain medium resolution (R=4100) spectra of 51 hot HB stars with 8000K≤Teff≤32000K during four consecutive nights. Eighteen of our targets are extreme horizontal branch (EHB) stars with Teff≥22000K. Radial velocity variations were measured with cross-correlation techniques, previously evaluated the statistical and systematic errors associated with them. No close binary system has been detected among our 51 targets. The data corrected for instrumental effects indicate that the radial velocity variations are always below ≃15km/s (3σ level). From a statistical analysis of our results, we conclude that (at 95% confidence level) the fraction of binaries with a ∼0.5M☉ companion among EHB stars in NGC 6752 is smaller than 20%. This empirical evidence sharply contrasts with what has been found for hot subdwarfs in the field, and opens new questions about the formation of EHB stars in globular clusters (and possibly in the field as well).

Abstract Copyright: ∼

Journal keyword(s): stars: horizontal-branch - binaries: close - binaries : spectroscopic - globular clusters: individual: NGC 6752

CDS comments: Table 1: Cl* NGC 6752 PKD NNNNN, see 2002A&A...391..945P and Piotto database.

Simbad objects: 63

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Number of rows : 63
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3916 0
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12645 1
3 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1419 0
4 BD-07 3477 HS* 12 44 20.2386233232 -08 40 16.846099536   10.46 10.594 10.895   sdB2VIIHe3 288 1
5 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3426 0
6 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2478 0
7 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2192 0
8 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 913 1
9 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 884 0
10 Cl* NGC 6752 PKD 36830 HS? 19 10 02.4577665432 -59 58 03.502505820   16.197 17.388     ~ 5 0
11 Cl* NGC 6752 PKD 38963 * 19 10 03.4453333488 -59 54 46.540105272   14.154 14.25     ~ 6 0
12 Cl* NGC 6752 PKD 38889 * 19 10 09.8377132776 -59 54 56.089204488   14.377 14.89     ~ 5 0
13 Cl* NGC 6752 PKD 35499 HS? 19 10 10.9192857960 -59 59 41.538561972           ~ 3 0
14 Cl* NGC 6752 PKD 35186 * 19 10 13.32 -60 00 03.3   14.204 14.443     ~ 3 0
15 Cl* NGC 6752 PKD 38504 * 19 10 15.3240436128 -59 55 41.618928936   14.668 14.80     ~ 8 0
16 Cl* NGC 6752 PKD 38087 HS? 19 10 18.1149879120 -59 56 23.891141472   15.993 17.190     ~ 6 0
17 Cl* NGC 6752 CL 158 HS? 19 10 18.8933109168 -59 58 28.749572724   14.75 14.83     ~ 8 0
18 Cl* NGC 6752 PKD 35662 HS? 19 10 22.1162356944 -59 59 30.296586840   14.444 15.010     ~ 4 0
19 Cl* NGC 6752 PKD 32470 * 19 10 22.1714921880 -59 55 54.372466596   14.41 14.681     ~ 3 0
20 Cl* NGC 6752 PKD 36480 Pu* 19 10 23.0185352352 -59 58 30.345014676   15.871 16.899     ~ 4 0
21 Cl* NGC 6752 PKD 36242 HS? 19 10 23.0351264808 -59 58 47.174054988   14.454 15.024     ~ 4 0
22 Cl* NGC 6752 PKD 39008 HS? 19 10 25.0274204040 -59 54 41.761057536   15.959 17.178     ~ 5 0
23 Cl* NGC 6752 PKD 38095 HS? 19 10 26.6080298904 -59 56 23.293951008   14.658 15.33     ~ 5 0
24 Cl* NGC 6752 PKD 28695 * 19 10 35.1098597856 -59 55 08.724580176   14.174 14.32     ~ 4 0
25 Cl* NGC 6752 PKD 11609 HS? 19 10 36.0288150792 -60 00 28.151224020   14.698 15.311     ~ 4 0
26 Cl* NGC 6752 PKD 14727 * 19 10 39.620 -59 59 39.10   14.134 14.253     ~ 3 0
27 Cl* NGC 6752 PKD 14664 * 19 10 41.3474877412 -59 59 39.884923311   14.058 13.972     ~ 4 0
28 Cl* NGC 6752 PKD 4964 * 19 10 49.9201419526 -60 04 08.079139393   14.294 14.552     ~ 3 0
29 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
30 Cl* NGC 6752 PKD 5455 HS? 19 10 52.7175139008 -60 03 36.881505576   16.224 17.371     ~ 5 0
31 Cl* NGC 6752 PKD 5487 HS? 19 10 57.5535017400 -60 03 35.055710244   15.831 16.766     ~ 5 0
32 Cl* NGC 6752 PKD 24849 * 19 10 59.4037190237 -59 57 05.989926086   14.305 14.578     ~ 3 0
33 Cl* NGC 6752 PKD 26760 HS? 19 10 59.7815338824 -59 56 17.502217512   14.799 15.50     ~ 5 0
34 Cl* NGC 6752 PKD 28947 HS? 19 11 04.7052449832 -59 54 56.588807880   15.853 16.832     ~ 4 0
35 Cl* NGC 6752 PKD 17941 * 19 11 04.827 -59 58 02.02   15.254 15.928     ~ 2 0
36 Cl* NGC 6752 PKD 15395 HS? 19 11 05.9372224896 -59 59 29.516413920   16.184 17.337     ~ 4 0
37 NGC 6752 13 * 19 11 07.6983357504 -60 00 52.989206616   14.42 14.06     ~ 4 0
38 Cl* NGC 6752 PKD 28554 HS? 19 11 07.9387073136 -59 55 14.127791628   16.175 17.289     ~ 5 0
39 Cl* NGC 6752 PKD 28693 HS? 19 11 08.1266103648 -59 55 08.554142640   16.134 17.306     ~ 6 0
40 Cl* NGC 6752 PKD 5134 HS? 19 11 09.6304508160 -60 03 56.260816884   14.909 15.615     ~ 5 0
41 Cl* NGC 6752 PKD 20919 * 19 11 10.4959924320 -59 58 15.229859628   13.954 13.844     ~ 3 0
42 Cl* NGC 6752 PKD 15026 * 19 11 12.3252073927 -59 59 34.509959190   13.976 14.018     ~ 3 0
43 Cl* NGC 6752 PKD 16551 HS? 19 11 14.2550707152 -59 59 13.867484820   14.757 15.420     ~ 4 0
44 Cl* NGC 6752 PKD 7843 * 19 11 14.678 -60 02 55.92   14.624 15.317     ~ 2 0
45 Cl* NGC 6752 CS 45 * 19 11 15.8779972944 -60 06 00.245796372   13.88 13.86 14.08   ~ 5 0
46 Cl* NGC 6752 PKD 11634 * 19 11 16.1066717064 -60 00 27.320226840   14.257 14.431     ~ 3 0
47 Cl* NGC 6752 PKD 18782 HS? 19 11 16.4347010544 -59 57 45.877221720   14.103 14.601     ~ 4 0
48 Cl* NGC 6752 PKD 20302 HS? 19 11 16.9322044536 -59 57 13.207543776   15.693 16.594     ~ 5 0
49 Cl* NGC 6752 PKD 27604 HS? 19 11 17.0398342872 -59 55 50.514921048   15.096 15.937     ~ 6 0
50 Cl* NGC 6752 PKD 28231 * 19 11 18.580 -59 55 27.50   16.276 17.367     ~ 3 0
51 Cl* NGC 6752 PKD 10625 HS? 19 11 21.0289319424 -60 00 45.415712592   16.4 17.701     ~ 6 0
52 Cl* NGC 6752 PKD 4672 HS? 19 11 21.5638547184 -60 04 31.495699812   16.058 17.181     ~ 5 0
53 Cl* NGC 6752 PKD 14944 * 19 11 22.4975696808 -59 59 35.516886396   14.73 15.37     ~ 5 0
54 Cl* NGC 6752 PKD 27181 HS? 19 11 24.2056359288 -59 56 04.060730472   14.412 15.073     ~ 5 0
55 Cl* NGC 6752 PKD 26756 * 19 11 25.7869489248 -59 56 17.053986084   14.334 14.599     ~ 3 0
56 Cl* NGC 6752 PKD 5201 HS? 19 11 26.7544574160 -60 03 51.846093972   16.434 17.615     ~ 6 0
57 Cl* NGC 6752 MMP 10711 * 19 11 28.17 -60 00 43.5   16.229 17.03     ~ 6 0
58 Cl* NGC 6752 CL 3781 HS* 19 11 29.7957547392 -60 02 54.929912424   16.89 17.13     sdB 10 0
59 Cl* NGC 6752 PKD 14770 HS? 19 11 32.5809337632 -59 59 37.620814704   16.055 17.247     ~ 5 0
60 Cl* NGC 6752 PKD 8672 HS? 19 11 32.6272727496 -60 01 30.846599544   16.524 17.790     ~ 5 0
61 HD 188112 HS* 19 54 31.4191828536 -28 20 20.679710640   10.01 10.22     sdB 96 0
62 Cl* NGC 6752 PKD 5865 * ~ ~   16.158 17.195     ~ 3 0
63 NAME Galactic Bulge reg ~ ~           ~ 4299 0

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