2011A&A...530A..22P


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST11:55:31

2011A&A...530A..22P - Astronomy and Astrophysics, volume 530A, 22-22 (2011/6-1)

An empirical calibration of Lick indices using Milky Way globular clusters.

PIPINO A. and DANZIGER I.J.

Abstract (from CDS):

We provide an empirical calibration relation to convert Lick indices into abundances for the integrated light of old, simple stellar populations for a large range in the observed [Fe/H] and [α/Fe]. This calibration supersedes the previously adopted ones because it is based on the real abundance pattern of the stars instead of the commonly adopted metallicity scale derived from the colours.We carried out a long-slit spectroscopic study of 23 Galactic globular clusters (GCs) for which detailed chemical abundances in stars have previously been measured. The line-strength indices, as defined by the Lick system and Serven and collaborators, were measured in low-resolution integrated spectra of the GC light. The results were compared to average abundances and abundance ratios in stars taken from the compilation by Pritzl and collaborators, as well as synthetic models. The Fe-related indices increase linearly as a function of [Fe/H] for [Fe/H]>-2. The Mg-related indices respond in a similar way to [Mg/H] variations, although Mgb turns out to be a less reliable metallicity indicator for [Z/H]←1.5. Despite our knowledge of the Mg overabundance with respect to Fe in GC stars, we are unable to infer a mean [Mg/Fe] for the integrated spectra that correlates with the resolved stars properties, because the sensitivity of the indices to [Mg/Fe] is smaller at lower metallicities. We present empirical calibrations for Ca, TiO, Ba, and Eu indices, as well as the measurements of Hα and NaD.

Abstract Copyright:

Journal keyword(s): globular clusters: general - galaxies: elliptical and lenticular, cD

Simbad objects: 26

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Number of rows : 26

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3463 0
2 NGC 362 GlC 01 03 14.26 -70 50 55.6   7.97 6.58     ~ 894 0
3 NGC 363 G 01 06 15.7898254137 -16 32 34.040338533   15   14.05   ~ 11 0
4 NGC 3201 GlC 10 17 36.82 -46 24 44.9   9.18 8.24     ~ 686 0
5 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6027 3
6 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 855 0
7 NGC 4833 GlC 12 59 33.92 -70 52 35.4   8.72 7.79     ~ 332 0
8 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1724 0
9 M 80 GlC 16 17 02.41 -22 58 33.9           ~ 593 0
10 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1633 0
11 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 555 0
12 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 653 0
13 NGC 6287 GlC 17 05 09.4907827015 -22 42 28.100632364   11.49 10.30     ~ 185 0
14 NGC 6293 GlC 17 10 10.42 -26 34 54.2   9.96 9.02     ~ 229 0
15 NGC 6342 GlC 17 21 10.14 -19 35 14.7   11.25 10.01     ~ 238 0
16 NGC 6352 GlC 17 25 29.11 -48 25 19.8   9.95 8.87     ~ 319 0
17 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 459 0
18 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1751 1
19 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 454 0
20 NGC 6541 GlC 18 08 02.36 -43 42 53.6   8.06 7.32     ~ 301 1
21 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 517 0
22 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1175 0
23 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 857 0
24 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1764 0
25 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 882 0
26 NAME Galactic Bulge reg ~ ~           ~ 3233 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-11:55:31

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