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J/A+A/517/A81  2nd and 3d parameters of HB of globular clusters (Gratton+, 2010)

The second and third parameters of the horizontal branch of globular clusters. Gratton R.G., Carretta E., Bragaglia A., Lucatello S., S'Orazii V. <Astron. Astrophys. 517, A81 (2010)> =2010A&A...517A..81G
ADC_Keywords: Clusters, globular ; Abundances ; Stars, horizontal branch Keywords: globular cluster: general - stars: abundances Abstract: The second parameter (the first being metallicity) defining the distribution of stars on the horizontal branch (HB) of globular clusters (GCs) has long been one of the major open issues in our understanding of the evolution of normal stars. Large photometric and spectroscopic databases are now available: they include large and homogeneous sets of colour-magnitude diagrams, cluster ages, and homogeneous data about chemical compositions from our FLAMES survey. We use these databases to re-examine this issue. Methods. We use the photometric data to derive median and extreme (i.e., the values including 90% of the distribution) colours and magnitudes of stars along the HB for about a hundred GCs. We transform these into median and extreme masses of stars on the HB, using the models developed by the Pisa group, and taking into account evolutionary effects. We compare these masses with those expected at the tip of the red giant branch (RGB) to derive the total mass lost by the stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 98 94 Basic parameters for globular clusters considered in this paper table2.dat 108 74 Photometric data from the HST-snapshot (Piotto et al., 2002, Cat. J/A+A/391/945) table3.dat 108 49 Photometric data from ground-based data (Rosenberg et al. 2000, Cat. J/A+AS/144/5 and J/A+AS/145/451) table4.dat 57 74 Intrinsic HB photometric parameters for GCs with HST data table5.dat 57 49 Intrinsic HB photometric parameters for GCs with ground-based data table6.dat 61 74 Masses on HB for GCs with HST data table7.dat 61 49 Masses on HB for GCs with ground-based data table8.dat 73 66 Properties of the RR Lyrae variables for each cluster table10.dat 40 94 Clusters ages from main sequence fitting and from HB both for HST and ground based data-set table11.dat 61 94 R' parameter as derived from both HST and ground based data table12.dat 55 64 Spread in He and mass required explaining the HB
See also: VII/195 : Globular Clusters in the Milky Way (Harris, 1996) J/A+A/391/945 : HST photometry of 74 galactic globular clusters (Piotto+ 2002) J/A+AS/144/5 : Nearby globular clusters photometric catalog (Rosenberg+ 2000) J/A+AS/145/451 : Nearby globular clusters photometric catalog (Rosenberg+ 2000) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 10- 16 A7 --- Name Other name 17- 22 F6.2 [Sun] [Fe/H] Metallicity 23- 29 F7.2 mag (m-M)V Distance modulus calculated from V magnitude 30- 36 F7.2 mag E(B-V) Redenning 37- 43 F7.2 mag VMAG Absolute V magnitude 44- 51 F8.2 --- HBR ? Horizontal-branch ratio = (B-R)/(B+V+R) 52- 58 F7.2 Gyr Age ? Estimated cluster age 59- 66 F8.3 solMass M(TO) ? Mass at turn-off 67- 74 F8.3 solMass M(RGB) ? Mass at the tip of the red-giant branch 75- 81 F7.3 --- IQR1 ? Interquartile of the [Na/O] (anti-)correlations 82- 89 F8.3 --- IQR2 ? Interquartile of the [Mg/Al] (anti-)correlations 90- 98 F9.3 [K] T(HB) ? Horizontal-branch effective temperature (log scale)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 9- 12 I4 --- n(HB) Number of Horizon Branch stars 14- 16 I3 --- n(fld) [0/125] Number of field stars (G1) 20- 25 F6.3 mag F555 Median F555W magnitude 28- 32 F5.3 mag e_F555 rms uncertainty on F555 34- 39 F6.3 mag 439-555 Median F439W-F555W colour index 42- 46 F5.3 mag e_439-555 rms uncertainty on F439-F555 49- 54 F6.3 mag F555m Minimum F555W magnitude 57- 61 F5.3 mag e_F555m rms uncertainty on F555m 63- 68 F6.3 mag 439-555m Minimum F439W-F555W colour index 71- 75 F5.3 mag e_439-555m rms uncertainty on (F439-F555)m 77- 82 F6.3 mag 439-555M Maximum F439W-F555W colour index 85- 89 F5.3 mag e_439-555M rms uncertainty on (F439-F555)M 91- 94 I4 --- n(RGB) Number of RGB stars 96-101 F6.3 mag 439-555G F439W-F555W colour index for RGB 104-108 F5.3 mag e_439-555G rms uncertainty on (F439-F555)RGB
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 8- 11 I4 --- n(HB) Number of HB stars in the cluster 13- 15 I3 --- n(fld) [0/47] Number of field stars (G1) 20- 25 F6.3 mag Vmag Median V magnitude 28- 32 F5.3 mag e_Vmag rms uncertainty on 34- 39 F6.3 mag V-I Median V-I colour index 42- 46 F5.3 mag e_V-I rms uncertainty on V-I 49- 54 F6.3 mag Vmagm Minimum V magnitude 57- 61 F5.3 mag e_Vmagm rms uncertainty on 63- 68 F6.3 mag (V-I)m Minimum V magnitude 71- 75 F5.3 mag e_(V-I)m rms uncertainty on (V-I)m 77- 82 F6.3 mag (V-I)M Maximum V-I colour index 85- 89 F5.3 mag e_(V-I)M rms uncertainty on (V-I)M 91- 94 I4 --- n(RGB) Number of RGB stars 96-101 F6.3 mag (V-I)G V-I colour index for RGB 104-108 F5.3 mag e_(V-I)G rms uncertainty on (V-I)RGB
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 11- 15 F5.3 mag (B-V)0G Intrinsic B-V colour index value, for RGB 19- 24 F6.3 mag (B-V)0m Minimim B-V colour index value 28- 33 F6.3 mag (B-V)0 Median B-V colour index value 36- 41 F6.3 mag (B-V)0M Maximum B-V colour index value 45- 49 F5.3 mag VMAGM Maximum absolute V magnitude 53- 57 F5.3 mag VMAG Median absolute V magnitude
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 10- 15 F6.3 mag (V-I)0G Intrinsic V-I colour index value, for RGB 19- 24 F6.3 mag (V-I)0m Mimimum V-I colour index value 28- 33 F6.3 mag (V-I)0 Median V-I colour index value 36- 41 F6.3 mag (V-I)0M Maximum V-I colour index value 45- 49 F5.3 mag VMAGM Maximum absolute V magnitude 53- 57 F5.3 mag VMAG Median absolute V magnitude
Byte-by-byte Description of file: table6.dat table7.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 11- 15 F5.3 solMass Mmin Mimimum mass 18- 22 F5.3 solMass e_Mmin ? rms uncertainty on Mmin 26- 30 F5.3 solMass Mmed Median mass 33- 37 F5.3 solMass e_Mmed ? rms uncertainty on Mmed 41- 45 F5.3 solMass Mmax ? Maximum mass 49- 53 F5.3 solMass e_Mmax ? rms uncertainty on Mmax 57- 61 F5.3 solMass dMmed ? Difference between median and minimum masses
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 10- 14 F5.1 --- S(RR) ? RR Lyrae richness parameter (Harris, 1996, Cat. VII/195) (1) 18- 19 I2 --- n(RR)H ? Number of RR Lyrae stars for HST sample 27- 30 F4.2 --- f(RR)H ? Fraction of RR Lyrae stars for HST sample 37- 39 I3 --- n(RR)g ? Number of RR Lyrae for ground-based sample 48- 51 F4.2 --- f(RR)g ? Fraction of RR Lyrae for ground-based sample 56- 59 F4.2 --- f(RR) ? Fraction of RR Lyrae stars 62- 66 F5.3 d <Pab> ? Mean period 70- 73 I4 --- n(Pab) ? Number of stars used to determine the period
Note (1): Number of RR Lyrae per unit cluster luminosity
Byte-by-byte Description of file: table10.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 10- 16 F7.2 Gyr Age ? Age from main-sequence fitting 17- 24 F8.3 Gyr Age(HB)H ? Age from horizontal branch fitting, for HST data-set 25- 32 F8.3 Gyr Age(HB)g ? Age from horizontal branch fitting, for ground-based data-set 33- 40 F8.3 Gyr Age(Y) ? Age value, determined with Ymed
Byte-by-byte Description of file: table11.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 8- 14 F7.2 --- R'(HST) ? R' parameter as derived from HST data (1) 15- 20 F6.2 --- e_R'(HST) ? rms uncertainty on R'(HST) 21- 27 F7.2 --- R'(GR) ? R' parameter as derived from ground-based data (1) 28- 33 F6.2 --- e_R'(GR) ? rms uncertainty on R'(GR) 34- 40 F7.2 --- <R'> ? Mean R' parameter (1) (2) 41- 46 F6.2 --- e_<R'> ? rms uncertainty on <R'> 47- 54 F8.3 --- Y(<R'>) ? He abundance for R'=<R'> 55- 61 F7.3 --- e_Y(<R'>) ? rms uncertainty on Y(<R'>)
Note (1): R' = NHB/N'RGB, where N'RGB is the number of stars on the RGB brighter than V(HB)+1. Note (2): Final adopted value <R'> is the weighted average between the two estimates, when available.
Byte-by-byte Description of file: table12.dat
Bytes Format Units Label Explanations
1- 7 A7 --- NGC/IC Cluster name 8- 15 F8.3 solMass dM(Y) Spread in mass δM(Y) 16- 23 F8.3 --- Ymed Median He abundance value 24- 31 F8.3 --- Ymax Maximum He abundance value 32- 39 F8.3 --- dY Difference between maximum and median Y values 40- 47 F8.3 mag d(B-V) Colour spread in δ(B-V) 48- 55 F8.3 mag d(V-I) Colour spread in δ(V-I)
Global Notes: Note (G1): this number is an estimation of those field stars expected to fall within the region of the color-magnitude diagram that we identified with the HB and the RGB, based on the galactic model TRILEGAL (Girardi et al. 2005A&A...436..895G; Vanhollebeke et al. 2009A&A...498...95V).
Acknowledgements: Raffaele Gratton, raffaele.gratton(at)oapd.inaf.it
(End) Raffaele Gratton [INAF-OAPD, Italy], Patricia Vannier [CDS] 11-May-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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