2002A&A...392..115P


Query : 2002A&A...392..115P

2002A&A...392..115P - Astronomy and Astrophysics, volume 392, 115-129 (2002/9-2)

Does the mixing length parameter depend on metallicity? Further tests of evolutionary sequences using homogeneous databases.

PALMIERI R., PIOTTO G., SAVIANE I., GIRARDI L. and CASTELLANI V.

Abstract (from CDS):

This paper is a further step in the investigation of the morphology of the color-magnitude diagram of Galactic globular clusters, and the fine-tuning of theoretical models, made possible by the recent observational efforts to build homogeneous photometric databases. In particular, we examine here the calibration of the morphological parameter WHB vs. metallicity, originally proposed by Brocato et al. (1998A&A...335..929B; B98), which essentially measures the color position of the red-giant branch. We show that the parameter can be used to have a first-order estimate of the cluster metallicity, since the dispersion around the mean trend with [Fe/H] is compatible with the measurement errors. The tight WHB-[Fe/H] relation is then used to show that variations in helium content or age do not affect the parameter, whereas it is strongly influenced by the mixing-length parameter α (as expected). This fact allows us, for the first time, to state that there is no trend of α with the metal content of a cluster. A thorough examination of the interrelated questions of the α-elements enhancement and the color-Teff transformations, highlights that there is an urgent need for an independent assessment of which of the two presently accepted metallicity scales is the true indicator of a cluster's iron content. Whatever scenario is adopted, it also appears that a deep revision of the V-I-temperature relations is needed.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: Hertzsprung-Russell (HR) and C-M diagrams - stars: horizontal-branch - stars: Population II - Galaxy: globular clusters: general - Galaxy: halo

Simbad objects: 49

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Number of rows : 49
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 956 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 978 0
3 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 449 0
4 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1289 0
5 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 742 0
6 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 447 0
7 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1296 0
8 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 768 0
9 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 913 0
10 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 372 0
11 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 557 0
12 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3120 0
13 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2326 0
14 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 754 0
15 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 262 0
16 NGC 5694 GlC 14 39 36.52 -26 32 18.0   11.58 10.89     ~ 276 0
17 NGC 5824 GlC 15 03 58.612 -33 04 06.70   10.28 9.56     ~ 360 0
18 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 352 0
19 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1829 0
20 NGC 5946 GlC 15 35 28.58 -50 39 35.0   11.98 10.72     ~ 172 0
21 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 326 0
22 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 648 0
23 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 254 0
24 NGC 6139 GlC 16 27 39.987 -38 50 57.03   11.03 9.68     ~ 186 0
25 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2061 0
26 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 604 0
27 NGC 6235 GlC 16 53 25.36 -22 10 38.8   11.99 7.20     ~ 166 0
28 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 721 0
29 M 19 GlC 17 02 37.69 -26 16 04.6   8.45 5.57     ~ 328 1
30 NGC 6284 GlC 17 04 28.747 -24 45 51.22   10.72 7.43     ~ 247 0
31 NGC 6287 GlC 17 05 09.4907827015 -22 42 28.100632364   11.49 10.30     ~ 203 0
32 NGC 6293 GlC 17 10 10.42 -26 34 54.2   9.96 9.02     ~ 251 0
33 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1955 0
34 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 510 0
35 NGC 6388 GlC 17 36 17.461 -44 44 08.34   7.40       ~ 836 1
36 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1844 1
37 NGC 6441 GlC 17 50 13.06 -37 03 05.2   9.26 8.00     ~ 797 0
38 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 479 1
39 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 338 1
40 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1262 0
41 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 346 0
42 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 450 0
43 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1856 0
44 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 380 0
45 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 787 0
46 NGC 6934 GlC 20 34 11.37 +07 24 16.1   10.48 9.75     ~ 375 0
47 M 72 GlC 20 53 27.70 -12 32 14.3   9.95 8.96     ~ 381 0
48 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2969 0
49 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 952 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-02:58:22

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