2000A&A...355..966S


Query : 2000A&A...355..966S

2000A&A...355..966S - Astronomy and Astrophysics, volume 355, 966-978 (2000/3-3)

The red giant branches of Galactic globular clusters in the [(V-I)0,MV] plane: metallicity indices and morphology.

SAVIANE I., ROSENBERG A., PIOTTO G. and APARICIO A.

Abstract (from CDS):

The purpose of this study is to carry out a thorough investigation of the changes in morphology of the red giant branch (RGB) of Galactic globular clusters (GGC) as a function of metallicity, in the V,I bands. To this aim, two key points are developed in the course of the analysis. (a) Using our photometric V,I database for Galactic globular clusters (the largest homogeneous data sample to date; Rosenberg et al., 1999AJ....118.2306R) we measure a complete set of metallicity indices, based on the morphology and position of the red-giant branch. In particular, we provide here the first calibration of the S, ΔV1.1 and ΔV1.4 indices in the (V-I,V) plane. We show that our indices are internally consistent, and we calibrate each index in terms of metallicity, both on the Zinn & West (1984ApJS...55...45Z) and the Carretta & Gratton (1997A&AS..121...95C) scales. Our new calibrations of the (V-I)0,g, ΔV1.2, (V-I)–3.0 and (V-I)–3.5 indices are consistent with existing relations. (b) Using a grid of selected RGB fiducial points, we define a function in the (V-I)0,MI,[Fe/H] space which is able to reproduce the whole set of GGC giant branches in terms of a single parameter (the metallicity). As a first test, we show that the function is able to predict the correct trend of our observed indices with metallicity. The usage of this function will improve the current determinations of metallicity and distances within the Local Group, since it allows to easily map (V-I)0,MI coordinates into [Fe/H],MI ones. To this aim the ``synthetic'' RGB distribution is generated both for the currently used Lee et al. (1990ApJ...350..155L) distance scale, and for the most recent results on the RR Lyr distance scale.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: Population II - galaxies: abundances - Galaxy: globular clusters: general

Simbad objects: 37

goto View the references in ADS

Number of rows : 37
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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3722 0
2 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 766 1
3 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 983 0
4 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1011 0
5 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 373 0
6 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 497 2
7 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 470 0
8 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1329 0
9 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 762 0
10 NAME Harrington-Wilson No1 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1127 1
11 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 797 0
12 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 935 0
13 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 382 0
14 NAME Centaurus A Sy2 13 25 27.6039817176 -43 01 09.493008456   8.18 6.84 6.66   ~ 4230 3
15 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2374 0
16 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 776 0
17 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 361 0
18 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1871 0
19 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 667 0
20 M 107 GlC 16 32 31.86 -13 03 13.6   9.96 8.85     ~ 744 0
21 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2099 0
22 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 623 0
23 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 741 0
24 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1997 0
25 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 366 0
26 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 530 0
27 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1876 1
28 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 347 1
29 M 69 GlC 18 31 23.10 -32 20 53.1   9.32 8.31     ~ 434 1
30 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1295 0
31 M 70 GlC 18 43 12.76 -32 17 31.6   9.76 9.06     ~ 354 0
32 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 465 0
33 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1894 0
34 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 389 0
35 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 807 0
36 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3021 0
37 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 280 0

To bookmark this query, right click on this link: simbad:objects in 2000A&A...355..966S and select 'bookmark this link' or equivalent in the popup menu


2022.05.22-15:24:41

© Université de Strasbourg/CNRS

    • Contact