J/A+A/549/A60 Ages and [Fe/H] of M31 globular clusters (Cezario+, 2013)
Full spectral fitting of Milky Way and M31 globular clusters: ages and
metallicities.
Cezario E., Coelho P.R.T., Alves-Brito A., Forbes D.A., Brodie J.P.
<Astron. Astrophys. 549, A60 (2013)>
=2013A&A...549A..60C 2013A&A...549A..60C
ADC_Keywords: Galaxies, nearby ; Clusters, globular ; Abundances, [Fe/H]
Keywords: globular clusters: general - galaxies: star clusters: individual: M31
Abstract:
The formation and evolution of disk galaxies are long standing
questions in Astronomy. Understanding the properties of globular
cluster systems can lead to important insights on the evolution of its
host galaxy.
We aim to obtain the stellar population parameters - age and
metallicity - of a sample of M31 and Galactic globular clusters.
Studying their globular cluster systems is an important step towards
understanding their formation and evolution in a complete way.
Description:
We present the stellar population parameters age and metallicity of a
sample of 38 M31 globular clusters, derived using spectral fitting
techniques.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 38 M31 GCs analysed in the present work
table3.dat 41 38 Ages and metallicities derived for M31
globular clusters
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See also:
J/A+A/416/917 : M31 globular clusters Revised Bologna Catalog (Galleti+, 2004)
J/MNRAS/402/803 : M31 globular cluster system (Peacock+, 2010)
J/A+A/544/A155 : M31 globular clusters (Federici+, 2012)
J/AJ/143/87 : IRAC photometry of massive M31 globular clusters (Barmby+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Cluster Cluster identification as in Galleti et al.
(2004, Cat. J/A+A/416/917) catalogue
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 19 F6.3 s RAs Right ascension (J2000)
21 A1 --- DE- Declination sign (J2000)
22- 23 I2 deg DEd Declination (J2000)
25- 26 I2 arcmin DEm Declination (J2000)
28- 32 F5.2 arcsec DEs Declination (J2000)
34- 39 F6.2 kpc dp Projected distance of the cluster to the
centre of M31
41- 43 I3 --- S/N Signal-to-noise ratio of the spectra as given
in the corresponding paper (1)
45 A1 --- r_S/N [ab] Reference for S/N (2)
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Note (1): when this information was not available (clusters B302, B305, B307,
B316, B331, B354), we estimated the S/N around 5000Å using standard
IRAF routines.
Note (2): Reference of the spectra as follows:
a = Beasley et al. (2004AJ....128.1623B 2004AJ....128.1623B)
b = Alves-Brito et al. (2009MNRAS.395L..34A 2009MNRAS.395L..34A)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Cluster Cluster identification as in Galleti et al.
(2004, Cat. J/A+A/416/917) catalogue
9- 14 F6.2 Gyr Age Age
15- 23 F9.2 Gyr e_Age Uncertainty in age
24- 32 F9.2 [Sun] [Fe/H] Metallicity [Fe/H]
33- 41 F9.2 [Sun] e_[Fe/H] Uncertainty in [Fe/H]
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Acknowledgements:
Paula Coelho, paulartcoelho(at)gmail.com
(End) P.R.T. Coelho [UCS], Patricia Vannier [CDS] 23-Nov-2012