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J/AJ/127/1513       Lick indices on M67 members              (Schiavon+, 2004)

The integrated spectrum of M67 and the spectroscopic age of M32. Schiavon R.P., Caldwell N., Rose J.A. <Astron. J., 127, 1513-1530 (2004)> =2004AJ....127.1513S
ADC_Keywords: Clusters, open ; Photometry Keywords: galaxies: clusters: general - galaxies: individual (M32) - galaxies: stellar content - open clusters and associations: individual (M67) - stars: evolution Abstract: We construct an integrated spectrum of the intermediate-age, solar-metallicity Galactic cluster M67, from individual spectroscopic observations of bona fide cluster members. The spectrum so obtained is used as a template to test our stellar population synthesis models, in an age and metallicity regime where such models remain largely untested. As a result, we demonstrate that our models predict a spectroscopic age of 3.5±0.5Gyr for M67, which is the same age we obtain from fitting isochrones to the color-magnitude diagram of the cluster. Full consistency is reached when using either Hβ, Hγ, or Hδ as the age indicator. We also check if the models, when applied to the cluster integrated spectrum, predict elemental abundances in agreement with the known detailed abundance pattern of the cluster. The models also pass the latter test, by predicting the abundances of iron, magnesium, carbon, and nitrogen in agreement with detailed abundance analyses of cluster stars to within 0.1dex. Encouraged by the high degree of consistency of our models, we apply them to the study of the integrated spectrum of the central 3" of the compact elliptical galaxy M32. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 08 51.3 +11 50 M 67 = NGC 2682 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 56 26 Stars not found to be members on M67 table2.dat 56 69 Stars found to be members of M67 and used in the construction of the cluster integrated spectrum table3.dat 31 17 Field stars included in the construction of the integrated spectrum of M67 table6.dat 95 95 Lick indices measured in the spectra of field and M67 Stars
See also: J/AJ/106/181 : CCD photometry of open cluster M67 (Montgomery+ 1993) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Stellar identification (1) 12- 13 I2 h RAh Hour of right ascension (J2000) 15- 16 I2 min RAm Minute of right ascension (J2000) 18- 22 F5.2 s RAs Second of right ascension (J2000) 24 A1 --- DE- Sign of declination (J2000) 25- 26 I2 deg DEd Degree of declination (J2000) 28- 29 I2 arcmin DEm Arcminute of declination (J2000) 31- 34 F4.1 arcsec DEs Arcsecond of declination (J2000) 36- 41 F6.3 mag Vmag The V-band magnitude 43- 48 F6.3 mag B-V The (B-V) color index 50- 56 A7 --- Crit Criteria for non-membership (2)
Note (1): Following the nomenclature of Montgomery, Marschall, & Janes, 1993, Cat. J/AJ/106/181, MMJ NNN: CL* NGC 2682 MMJ NNNN in Simbad Note (2): Reasons for determination of non-membership are: 1: radial velocity 2: proper motion 3: position in CMD 4: metallicity
Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Stellar identification (1) 12- 13 I2 h RAh Hour of right ascension (B1950) 15- 16 I2 min RAm Minute of right ascension (B1950) 18- 22 F5.2 s RAs Second of right ascension (B1950) 24 A1 --- DE- Sign of declination (B1950) 25- 26 I2 deg DEd Degree of declination (B1950) 28- 29 I2 arcmin DEm Arcminute of declination (B1950) 31- 34 F4.1 arcsec DEs Arcsecond of declination (B1950) 36- 41 F6.3 mag Vmag The V-band magnitude 43- 48 F6.3 mag B-V The (B-V) color index 50- 56 A7 --- Crit Criteria for non-membership (2)
Note (1): Following the nomenclature of Montgomery, Marschall, & Janes, 1993, Cat. J/AJ/106/181, MMJ NNN: CL* NGC 2682 MMJ NNNN in Simbad Note (2): Reasons for determination of non-membership are: 1: radial velocity 2: proper motion 3: position in CMD 4: metallicity
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name 12- 17 F6.3 mag Vmag V magnitude 19- 22 F4.2 mag B-V B-V color index 24- 31 A8 --- SpType MK Spectral type
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Stellar identification (1) 12- 18 F7.4 0.1nm HdF Lick/IDS Hdelta_F_ index (e_HdF=0.03) (2) 20- 26 F7.4 mag CN1 Lick/IDS CN1 index (e_CN1=0.007) (2) 28- 34 F7.4 mag CN2 Lick/IDS CN2 index (e_CN2=0.0004) (2) 36- 42 F7.4 0.1nm G4300 Lick/IDS G4300 index (e_G4300=0.005) (2) 44- 50 F7.4 0.1nm HgF Lick/IDS Hgamma_F_ index (e_HgF=0.02) (2) 52- 58 F7.4 0.1nm Fe4383 Lick/IDS Fe4383 index (e_Fe4383=0.04) (2) 60- 65 F6.4 0.1nm Hb Lick/IDS Hbeta index (e_Hb=0.04) (2) 67- 73 F7.4 0.1nm Mgb Lick/IDS Mg b index (e_Mgb=0.08) (2) 75- 80 F6.4 mag Mg2 Lick/IDS Mg_2_ index (e_Mg2=0.005)(2) 82- 87 F6.4 0.1nm Fe5270 Lick/IDS Fe5270 index (e_Fe5270=0.02) (2) 89- 94 F6.4 0.1nm Fe5335 Lick/IDS Fe5335 index (e_Fe5335=0.04) (2)
Note (1): The identification numbers of M67 (MMJ NNNN) stars are from Montgomery et al., 1993, Cat. J/AJ/106/181, Cl* NGC 2682 MMJ NNNN in Simbad, else, HD designation. Note (2): Mean errors estimated as described in section 2.2.1.
History: * 06-Apr-2004: From electronic version of the journal * 06-Jan-2005: Equinox of position of table1 corrected (J2000 instead of B1950)
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Apr-2004
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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