2003A&A...406..691L


Query : 2003A&A...406..691L

2003A&A...406..691L - Astronomy and Astrophysics, volume 406, 691-702 (2003/8-1)

Rotation in Globular Cluster stars. Turn-off and subgiant stars in NGC 104, NGC 6397 and NGC 6752.

LUCATELLO S. and GRATTON R.G.

Abstract (from CDS):

We present a derivation of upper limits to the rotation of Main Sequence stars in three globular clusters using spectra obtained during time allocated to the ESO Large Programs 165-L0263 and 167.D-0173, with UVES at VLT2 (Kueyen). The stars analyzed in this work do not show any evidence of high values of rotational velocities as far as the outer layers are concerned, in particular robust estimates for the upper limits of the values of the mean projected rotational velocities are placed, about <vrotsini≥3.5±0.2km/s and about <vrotsini≥4.7±0.2km/s for, respectively, the program turn-off and subgiant stars. On the basis of statistical considerations, assuming that inclination of the rotational axis i is randomly oriented, and that all stars within the same group rotate at the same rate, we obtain estimates for the values of the true rotational velocities. These values are upper limits to the true rotational velocities if there is some star-to-star scatter in rotational or macro-turbulent velocities. The mean values of these upper limits for vrot for the stars of the same spectral type averaged over the three clusters are found to be respectively, <v>rot≤3.5±0.4km/s and <v>rot≤2.6±1.1km/s. Thus, the explanation for the large rotational velocities found for the Horizontal Branch stars must be looked for either in the rotation of the core not detectable in the outer layers (Sills & Pinsennault, 2000ApJ...540..489S) or in the acquisition of angular momentum during their evolution.

Abstract Copyright:

Journal keyword(s): stars: rotation - globular clusters: individual: NGC 104 - globular clusters: individual: NGC 6397 - globular clusters: individual: NGC 6752

Nomenclature: Table 2: Cl* NGC 104 GVS NNNNNN N=14.

CDS comments: Tables 2,5,12 : Sources Grundahl = Cl* NGC 104 GVS NNNNNN or Cl* NGC 6397 GVS NNNNNN or Cl* NGC 6752 GVS NNNNNN. Stars are from unpublished list of Grundahl+ see The Galactic Halo: from Globular Clusters to field Stars, Proceedings of the 35th Liege International Astrophysics Colloquium, ed. A. Noels, P. Magain, & D. Caro, Institut d'Astrophysique et de Geophysique, Liege, 503.

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl* NGC 104 GVS 206415 * 00 19 36.40 -71 58 57.0           ~ 4 0
2 Cl* NGC 104 GVS 201600 * 00 21 52.55 -72 05 27.7           ~ 4 0
3 Cl* NGC 104 GVS 201075 * 00 22 00.40 -72 05 59.4           ~ 5 0
4 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3736 0
5 G 4-37 PM* 02 44 35.0876406984 +08 28 50.094009408   11.90   11.0   F7 79 0
6 HD 31623 * 04 57 17.1910500528 -01 04 02.123786748   6.655 6.241     F3/5III 43 0
7 HD 34045 * 05 13 59.9493412200 -14 36 24.730914636   6.586 6.210     A9II/III 40 0
8 * gam Lep PM* 05 44 27.7906169580 -22 26 54.187756254 4.08 4.07 3.60 3.15 2.89 F6V 412 0
9 HD 42278 PM* 06 09 36.2520884448 -05 42 41.144379624   6.493 6.148     F0IV 44 0
10 HD 49434 gD* 06 48 19.0662941232 -01 19 08.124232296   6.015 5.731     F0V+ 87 0
11 * I Pup a2* 07 12 33.6249752 -46 45 33.494912 4.80 4.81 4.49 4.17 3.95 F3VFe-1.0 133 0
12 * j Pup * 07 56 51.5389962 -22 52 48.433986   4.900 4.184     F7II 102 0
13 * alf Cha PM* 08 18 31.5531890 -76 55 10.996432   4.448 4.047     F5VFe-0.8 98 0
14 HD 120559 PM* 13 51 40.3987847839 -57 26 08.350982731 8.679 8.647 7.982 7.605 7.217 G7VFe-1.4CH-1 149 0
15 HD 121004 PM* 13 53 58.1163626566 -46 32 19.522719077   10.112 9.522     G2V 143 0
16 Cl* NGC 6397 GVS 1543 * 17 39 36.17 -53 40 20.7           ~ 5 0
17 Cl* NGC 6397 GVS 793 HB* 17 39 55.9063498560 -53 35 11.987646072   16.090 15.551   14.56 ~ 8 0
18 Cl* NGC 6397 GVS 1905 * 17 40 01.13 -53 35 56.9           ~ 5 0
19 Cl* NGC 6397 GVS 1622 * 17 40 09.0995847720 -53 43 26.481113472   16.596 16.200   15.622 ~ 6 0
20 Cl* NGC 6397 GVS 201432 * 17 40 16.0805487576 -53 47 18.740098536   16.669 16.278   15.708 ~ 6 0
21 Cl* NGC 6397 GVS 206810 * 17 40 34.5834591072 -53 33 20.863550880   16.058 15.514   14.54 ~ 7 0
22 Cl* NGC 6397 GVS 202765 * 17 40 41.5970413368 -53 45 49.368731148   16.662 16.271   15.701 ~ 6 0
23 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1885 1
24 Cl* NGC 6397 GVS 669 * 17 40 43.7537697168 -53 37 17.519866212   15.899 15.339   14.34 ~ 7 0
25 BD+13 3683 SB* 18 33 16.8450962112 +13 09 25.493753160   11.19   10.0   F5 97 0
26 Cl* NGC 6752 GVS 1481 * 19 10 19.68 -60 01 27.8     15.95     ~ 6 0
27 Cl* NGC 6752 GVS 4661 * 19 10 20.98 -60 01 47.6     17.216     ~ 7 0
28 Cl* NGC 6752 GVS 1406 * 19 10 22.32 -60 03 19.7     15.90     ~ 6 0
29 Cl* NGC 6752 GVS 1460 * 19 10 23.82 -59 59 07.1     15.94     ~ 5 0
30 Cl* NGC 6752 GVS 4341 * 19 10 29.79 -59 57 52.7     17.149     ~ 6 0
31 Cl* NGC 6752 GVS 1400 * 19 10 31.6223599560 -59 59 34.640838168     15.89     ~ 5 0
32 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1902 0
33 Cl* NGC 6752 GVS 202316 * 19 10 59.54 -59 54 00.4           ~ 6 0
34 Cl* NGC 6752 GVS 4428 * 19 10 59.8758025704 -60 02 17.122587576     17.142     ~ 9 0
35 Cl* NGC 6752 GVS 1665 * 19 11 05.0159482728 -59 55 27.384044556     16.08     ~ 7 0
36 Cl* NGC 6752 GVS 1461 * 19 11 05.18 -60 01 51.2     15.95     ~ 6 0
37 Cl* NGC 6752 GVS 1445 * 19 11 05.44 -60 01 45.9     15.89     ~ 5 0
38 Cl* NGC 6752 GVS 4383 * 19 11 13.20 -60 02 24.2     17.112     ~ 6 0
39 Cl* NGC 6752 GVS 5048 * 19 11 19.958 -59 59 50.52     16.10     ~ 8 0
40 Cl* NGC 6752 GVS 1563 * 19 11 21.3659942016 -59 59 51.012031020     16.06     ~ 6 0
41 Cl* NGC 6752 GVS 4907 * 19 11 22.87 -60 03 57.6     17.199     ~ 8 0
42 Cl* NGC 6752 GVS 4458 * 19 11 26.26 -60 00 48.7     17.155     ~ 6 0
43 Cl* NGC 6752 GVS 200613 * 19 11 35.7511814976 -59 58 02.021234016           ~ 10 0
44 CD-30 18140 PM* 20 44 06.2872647830 -30 00 07.597192977   10.326 9.932     F8 85 0
45 BD+17 4708 SB* 22 11 31.3756832854 +18 05 34.177983548 9.73 9.91 9.46 9.03 8.70 sdF8 553 0

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2022.08.09-04:18:51

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