2003ApJS..149...67B

Query : 2003ApJS..149...67B

2003ApJS..149...67B - Astrophys. J., Suppl. Ser., 149, 67-99 (2003/November-0)

Chemical abundances and rotation velocities of blue horizontal-branch stars in six globular clusters.

BEHR B.B.

Abstract (from CDS):

High-resolution spectroscopic measurements of blue horizontal-branch stars in six metal-poor globular clusters–M3, M13, M15, M68, M92, and NGC 288–reveal remarkable variations in photospheric composition and rotation velocity as a function of a star's position along the horizontal branch. For the cooler stars (Teff<11,200 K), the derived abundances are in good agreement with the canonical cluster metallicities, and we find a wide range of vsini rotation velocities, some as high as 40 km/s. In the hotter stars, however, most metal species are strongly enhanced, by as much as 3 dex, relative to the expected cluster metallicity, while helium is depleted by 2 dex or more. In addition, the hot stars all rotate slowly, with vsini<8km/s. The anomalous abundances appear to be due to atomic diffusion mechanisms–gravitational settling of helium, and radiative levitation of metals–in the nonconvective atmospheres of these hot stars. We discuss the influence of these photospheric metal enhancements on the stars' photometric properties and explore possible explanations for the observed distribution of rotation velocities.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: General - globular clusters: individual (NGC 288, NGC 4590) - Galaxy: Globular Clusters: Individual: NGC Number: NGC 5272 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 6205 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 6341 - Galaxy: Globular Clusters: Individual: NGC Number: NGC 7078 - Stars: Abundances - Stars: Horizontal-Branch - Stars: Rotation

Nomenclature: Tables, Fig.3: Cl* NGC 6205 WF N-NNNN N=9.

Simbad objects: 81

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Number of rows : 81
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl* NGC 288 ALC 137 HB* 00 52 27.4245191808 -26 35 58.933706964   16.16 16.42     ~ 13 0
2 Cl* NGC 288 SAN 29 HB* 00 52 42.8471406720 -26 31 06.951688320   16.0       ~ 10 0
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
4 RGO 10703 HB* 00 52 59.3444628792 -26 39 00.542615544   16.42 16.68     ~ 12 0
5 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
6 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
7 Cl* NGC 4590 WALK 71 * 12 39 18.5457747970 -26 46 55.099719338   15.957 15.885   15.757 ~ 4 0
8 Cl* NGC 4590 WALK 72 * 12 39 18.7390234776 -26 44 38.962370112   16.359 16.372   16.351 ~ 4 0
9 Cl* NGC 4590 WALK 114 * 12 39 22.2327248515 -26 44 42.196873018   15.911 15.734   15.473 ~ 4 0
10 Cl* NGC 4590 WALK 120 * 12 39 23.0224393728 -26 38 18.598398108   15.936 15.861   15.760 ~ 4 0
11 Cl* NGC 4590 WALK 161 * 12 39 24.5958650531 -26 45 44.522917414   15.978 15.896   15.752 ~ 4 0
12 Cl* NGC 4590 WALK 279 * 12 39 27.4396313712 -26 47 36.581483112   15.934 15.862   15.738 ~ 4 0
13 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
14 Cl* NGC 4590 WALK 324 * 12 39 28.7527292155 -26 45 53.247241246   15.976 15.772   15.485 ~ 5 0
15 Cl* NGC 4590 WALK 340 HB* 12 39 29.2839481560 -26 42 53.807691456   15.925 15.748   15.484 ~ 5 0
16 Cl* NGC 4590 WALK 464 HB* 12 39 32.8474212744 -26 45 52.379146692   15.696 15.491   15.140 ~ 5 0
17 Cl* NGC 4590 WALK 468 * 12 39 32.9764540848 -26 46 56.251896046   15.921 15.839   15.717 ~ 4 0
18 Cl* NGC 4590 WALK 510 * 12 39 37.4540282160 -26 44 29.089365396   15.903 15.718   15.383 ~ 5 0
19 NGC 5272 204 * 13 41 45.5633596191 +28 17 34.651797690   15.5 15.97     ~ 12 0
20 NGC 5272 740 * 13 42 10.7675446032 +28 19 05.320998552   14.18       G5IV-V 14 0
21 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
22 NGC 5272 1369 * 13 42 33.2737018584 +28 23 57.360927660   16.22 16.28     ~ 10 0
23 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 780 0
24 NGC 6205 6 * 16 41 09.9360699984 +36 30 10.392889356   15.17 15.00     ~ 20 0
25 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
26 2MASS J16415196+3624337 RG* 16 41 51.9531609840 +36 24 33.699251556   15.20 15.07     ~ 13 0
27 NGC 6341 6010 * 17 16 23.6816209416 +43 08 13.166537676   15.37 15.24     ~ 12 0
28 NGC 6341 6061 * 17 16 50.6751627072 +43 09 20.952422856   15.45 15.31     ~ 11 0
29 NGC 6341 6067 * 17 16 50.9941644144 +43 09 03.213328644   15.0       ~ 10 0
30 NGC 6341 5055 * 17 16 51.2011900272 +43 10 01.748356932   15.46 15.30     ~ 9 0
31 NGC 6341 8030 * 17 16 51.9679785480 +43 05 36.552957108   15.5       ~ 10 0
32 Cl* NGC 6341 BUON 331 * 17 16 58.934 +43 07 44.10   15.84       ~ 3 0
33 NGC 6341 4078 * 17 17 00.319 +43 10 30.59   15.33 15.15     ~ 8 0
34 NGC 6341 5124 HS? 17 17 00.4196888016 +43 09 56.680350660   16.34       ~ 6 0
35 NGC 6341 4017 * 17 17 00.6485993088 +43 13 02.991768672   15.54 15.51     ~ 16 0
36 Cl* NGC 6341 BUON 466 * 17 17 04.7867277288 +43 06 17.914003236   15.43       ~ 5 0
37 NGC 6341 4027 * 17 17 06.6476323176 +43 12 23.114018304   15.38 15.20     ~ 16 0
38 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
39 NGC 6341 10022 * 17 17 07.9375640520 +43 04 27.510905532   15.33 15.16     ~ 12 0
40 Cl* NGC 6341 CUD 26 * 17 17 10.70 +43 09 58.9   14.74       ~ 6 0
41 2MASS J17171122+4310102 RG* 17 17 11.2230682080 +43 10 10.258696416   15.77 15.08     ~ 7 0
42 Cl* NGC 6341 BUON 176 * 17 17 12.1894696032 +43 09 40.282960788   15.81       ~ 5 0
43 Cl* NGC 6341 BUON 202 * 17 17 13.3714610496 +43 09 32.375646360   15.33       ~ 5 0
44 GSC 03085-01009 HB* 17 17 21.123 +43 12 23.63   15.37 15.24     ~ 19 0
45 NGC 6341 1038 * 17 17 21.3752261304 +43 09 20.704360176   15.32 15.15     ~ 8 0
46 NGC 6341 12023 * 17 17 25.3350537336 +43 07 12.101533464   15.62       ~ 6 0
47 NGC 6341 1021 * 17 17 27.8274450720 +43 08 51.217560816   15.33 15.23     ~ 10 0
48 NGC 6341 12010 * 17 17 29.61 +43 06 20.8   15.34 15.27     ~ 12 0
49 NGC 6341 12009 * 17 17 29.9520243360 +43 06 10.182962916   15.24 15.09     ~ 13 0
50 NGC 6341 12001 * 17 17 44.6787018168 +43 05 59.034693048   15.29 15.11     ~ 17 0
51 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
52 NGC 7078 71 * 21 29 43.8380354328 +12 08 56.461362288   16.03 15.89     ~ 7 0
53 NGC 7078 88 * 21 29 45.872 +12 11 27.38   16.15 15.99     ~ 8 0
54 NGC 7078 261 * 21 29 53.516 +12 07 35.55   16.07 15.93     ~ 8 0
55 NGC 7078 1080 * 21 29 56.502 +12 10 39.85   16.77 16.79     ~ 8 0
56 NGC 7078 491 RG* 21 29 56.9822852184 +12 12 16.414470684   16.06 15.91     ~ 13 0
57 NGC 7078 637 * 21 29 57.266 +12 10 24.16   16.56 16.56     ~ 9 0
58 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
59 NGC 7078 1000 * 21 30 07.55 +12 10 46.8   16.75 16.72     ~ 9 0
60 Cl* NGC 6205 WF 3-1718 * ~ ~   15.83 15.77     ~ 4 0
61 Cl* NGC 6205 WF 3-548 * ~ ~   16.61 16.52     ~ 4 0
62 Cl* NGC 6205 WF 2-3123 * ~ ~   16.91 16.84     ~ 4 0
63 Cl* NGC 6205 WF 2-3035 * ~ ~   15.35 15.34     ~ 3 0
64 Cl* NGC 6205 WF 2-2692 * ~ ~   16.41 16.34     ~ 5 0
65 Cl* NGC 6205 WF 2-2541 * ~ ~   16.56 16.47     ~ 5 0
66 Cl* NGC 6205 WF 2-820 * ~ ~   16.16 16.03     ~ 5 0
67 Cl* NGC 5272 S 12066 * ~ ~   15.97 15.96     ~ 3 0
68 Cl* NGC 6205 SAV 404 * ~ ~           ~ 2 0
69 Cl* NGC 6205 SAV 113 * ~ ~           ~ 2 0
70 Cl* NGC 6205 WF 4-3485 * ~ ~           ~ 5 0
71 Cl* NGC 6341 BUON 177 * ~ ~           ~ 1 0
72 Cl* NGC 6341 BUON 516 * ~ ~   15.47 15.40     ~ 4 0
73 NGC 7078 818 * ~ ~   16.14 15.99     ~ 5 0
74 NGC 7078 276 * ~ ~   16.67 16.68     ~ 9 0
75 NGC 7078 163 * ~ ~   16.60 16.58     ~ 6 0
76 NGC 7078 119 * ~ ~   16.78 16.80     ~ 8 0
77 Cl* NGC 5272 S 14078 * ~ ~   15.88 15.88     ~ 4 0
78 Cl* NGC 5272 S 13022 * ~ ~   15.78 15.70     ~ 4 0
79 Cl* NGC 288 BUON 16 * ~ ~   16.52 16.54     ~ 6 0
80 Cl* NGC 6341 BUON 244 * ~ ~           ~ 1 0
81 Cl* NGC 6205 WF 4-3085 * ~ ~     16.23     ~ 6 0

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