J/A+A/462/107 Simulations of metal-poor star clusters (Fagiolini+, 2007)
Monte Carlo simulations of metal-poor star clusters.
Fagiolini M., Raimondo G., Degl'Innocenti S.
<Astron. Astrophys. 462, 107 (2007)>
=2007A&A...462..107F 2007A&A...462..107F
ADC_Keywords: Clusters, globular ; Models, evolutionary ; Photometry
Keywords: stars: evolution - Galaxy: globular clusters: general -
galaxies: star clusters
Abstract:
The intrinsic uncertainty (due to statistical effects) affecting the
integrated colours and mass-to-light ratios as a function of the
cluster's integrated visual magnitude (MVtot^_) is studied. We
investigate the case of metal-poor, single-burst stellar populations
with age from a few million years to a likely upper value for the
Galactic globular cluster ages. Monte Carlo techniques are used for
randomly generating stars distributed according to the cluster's mass
function. Integrated colours and mass-to-light ratios in different
photometric bands are presented as a function of age for different
assumptions on the cluster total V magnitude and they are checked
for good agreement with the observational values of low-metallicity
Galactic clusters.
Description:
Table 2 and table 3 list integrated colours in the standard
photometric and HST bands respectively. Table 6 lists the
mass-too-light ratios in the standard photometric system and in solar
units. All tables contain models computed for different assumptions of
the exponent of the initial mass function in the proper mass interval
(see the paper for more details).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 98 189 Integrated colours in the standard photometric
system
table3.dat 79 162 Integrated colours in the HST filters
table6.dat 112 297 Mass-to-light ratios in the standard photometric
system and in solar units
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 mag VMAG Model absolute V magnitude value (1)
4- 6 F3.1 --- alpha Model alpha value (IMF exponent) (1)
8- 14 F7.1 Myr Age Age of the Simple Stellar Population (SSP)
15- 20 F6.2 mag Vmag Integrated V magnitude
21- 26 F6.2 mag e_Vmag 1 sigma error on Vmag
27- 32 F6.2 mag U-B Integrated U-B color
33- 38 F6.2 mag e_U-B 1 sigma error on U-B
39- 44 F6.2 mag B-V Integrated B-V color
45- 50 F6.2 mag e_B-V 1 sigma error on B-V
51- 56 F6.2 mag V-R Integrated V-R color
57- 62 F6.2 mag e_V-R 1 sigma error on V-R
63- 68 F6.2 mag V-I Integrated V-I color
69- 74 F6.2 mag e_V-I 1 sigma error on V-I
75- 80 F6.2 mag V-J Integrated V-J color
81- 86 F6.2 mag e_V-J 1 sigma error on V-J
87- 92 F6.2 mag V-K Integrated V-K color
93- 98 F6.2 mag e_V-K 1 sigma error on V-K
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Note (1): Models [VMAG, alpha] are:
[-4 2.0], [-4 2.3], [-4 2.6], [-6 2.3], [-8 2.0], [-8 2.3], [-8 2.6]
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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- 2 I2 mag VMAG Model absolute V magnitude value (1)
4- 6 F3.1 --- alpha Model alpha value (IMF exponent) (1)
8- 14 F7.1 Myr Age Age of the Simple Stellar Population (SSP)
16- 21 F6.3 mag VF439W(2) Integrated V-F439W(2) color
23- 27 F5.3 mag e_VF439W(2) 1 sigma error on VF439W(2) color
29- 34 F6.3 mag VF555W(2) Integrated V-F555W(2) color
36- 40 F5.3 mag e_VF555W(2) 1 sigma error on VF555W(2) color
42- 47 F6.3 mag VF814W(2) Integrated V-F814W(2) color
49- 53 F5.3 mag e_VF814W(2) 1 sigma error on VF814W(2) color
55- 60 F6.3 mag VF110W(1) Integrated V-F110W(1) color
62- 66 F5.3 mag e_VF110W(1) 1 sigma error on VF110W(1) color
68- 73 F6.3 mag VF160W(1) Integrated V-F160W(1) color
75- 79 F5.3 mag e_VF160W(1) 1 sigma error on VF160W(1) color
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Note (1): Models [VMAG, alpha] are:
[-4 2.0], [-4 2.3], [-4 2.6], [-8 2.0], [-8 2.3], [-8 2.6]
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 2 I2 mag VMAG Model absolute V magnitude value (1)
4- 6 F3.1 --- alpha Model alpha value (IMF exponent) (1)
8- 14 F7.1 Myr Age Age of the Simple Stellar Population (SSP)
16- 21 F6.3 Sun M/LV Mass-to-light ratio in the V-band
24- 28 F5.3 Sun e_M/LV 1 sigma error on Vmag
30- 35 F6.3 Sun M/LU Mass-to-light ratio in the U-band
38- 42 F5.3 Sun e_M/LU 1 sigma error on Umag
44- 49 F6.3 Sun M/LB Mass-to-light ratio in the B-band
52- 56 F5.3 Sun e_M/LB 1 sigma error on Bmag
58- 63 F6.3 Sun M/LR Mass-to-light ratio in the R-band
66- 70 F5.3 Sun e_M/LR 1 sigma error on Rmag
72- 77 F6.3 Sun M/LI Mass-to-light ratio in the I-band
80- 84 F5.3 Sun e_M/LI 1 sigma error on Imag
86- 91 F6.3 Sun M/LJ Mass-to-light ratio in the J-band
94- 98 F5.3 Sun e_M/LJ 1 sigma error on Jmag
100-105 F6.3 Sun M/LK Mass-to-light ratio in the K-band
108-112 F5.3 Sun e_M/LK 1 sigma error on Kmag
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Note (1): Models [VMAG, alpha] are:
[-4 0.8], [-4 1.8], [-4 2.0], [-4 2.3], [-4 2.6], [-6 2.0],
[-8 0.8], [-8 1.8], [-8 2.0], [-8 2.3], [-8 2.6]
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Acknowledgements:
Gabriella Raimondo, raimondo(at)oa-teramo.inaf.it
(End) Gabriella Raimondo [INAF-OATeramo], Patricia Vannier [CDS] 31-Oct-2006