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J/A+A/470/585       NGC 2682 uvby-Hbeta photometry       (Balaguer-Nunez+, 2007)

uvby-Hβ CCD photometry and membership segregation of the open cluster NGC 2682 (M 67). Balaguer-Nunez L., Galadi-Enriquez D., Jordi C., <Astron. Astrophys. 470, 585 (2007)> =2007A&A...470..585B
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, uvby, beta Keywords: Galaxy: open clusters and associations: individual: NGC 2682 - techniques: photometry - astrometry - methods: observational - methods: data analysis Abstract: Following deep astrometric and photometric study of the cluster NGC 2682 (M 67), we are able to accurately determine its fundamental parameters. Being an old and rich cluster, M 67 is relevant for the analysis of the Galactic disk evolution. M 67 is well studied but lacks a wide and deep Stroemgren photometric study. The brightest stars of the open cluster M 67 were used as uvby-Hbeta standard stars in our studies of NGC 1817 and NGC 2548, and the extension of the field covered, as well as the number of observations, allowed us to obtain the best set of Stroemgren data ever published for this cluster. We discuss the results of our CCD uvby-Hbeta intermediate-band photometry, covering an area of about 50'x50' down to V∼19. Moreover, a complete membership segregation based on astrometric and photometric criteria is obtained. The photometric analysis of a selected sample of stars yields a reddening value of E(b-y)=0.03±0.03, a distance modulus of V0-MV=9.7±0.2 and [Fe/H]=0.01±0.14. Through isochrone fitting we found an age of logt=9.6±0.1 (4.2±0.2Gyr). A clump of approximately 60 stars around V=16, (b-y)=0.4 could be interpreted as a population of pre-cataclysmic variable stars (if members), or as a stream of field G-type stars placed at twice the distance of the cluster (if non-members). Description: The catalogue of uvby-Hbeta and J2000 coordinates for 1843 stars in an area of 50'x50' around NGC 2682. We mark the selection of probable members of NGC 2682, combining the photometric study with an astrometric analysis. The cross-identification of stars in common with the astrometry (Zhao et al., 1993, Cat. J/A+AS/100/243), BDA (htpp://obswww.unige.ch/WEBDA), Sanders (1977A&AS...27...89S), Hipparcos (ESA, 1997, Cat. I/239), Tycho-2 (Hog et al., 2000, Cat. I/259), and USNO-2 (Monet et al., 1998, Cat. I/252) catalogues. The proper motions from Zhao et al. (1993, Cat. J/A+AS/100/243), their errors and membership probabilities of 1046 stars in the area of M∼67, with parametric and non parametric membership probabilities. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 136 1843 Stromgren photometry of stars in NGC 2682 area table4.dat 82 1843 Cross-identification of stars table7.dat 62 1046 Parametric and Non-Parametric Astrometric Probability
See also: I/252 : The USNO-A2.0 Catalogue (Monet+ 1998) I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) I/259 : The Tycho-2 Catalogue (Hog+ 2000) J/A+AS/100/243 : Proper motions in M 67 (Zhao+, 1993) http://www.univie.ac.at/webda : WEBDA Database Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Sequential identification number 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 18 F6.3 s RAs Right ascension (J2000) 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 30 F5.2 arcsec DEs Declination (J2000) 31- 39 F9.3 arcmin xpos x-frame coordinate in arcmin 40- 48 F9.3 arcmin ypos y-frame coordinate in arcmin 49- 57 F9.3 mag b-y ?=99.99 b-y color index 58- 65 F8.4 mag e_b-y ?=9.99 error in b-y 66- 74 F9.3 mag Vmag ?=99.99 V magnitude 75- 82 F8.4 mag e_Vmag ?=9.99 error in Vmag 83- 91 F9.3 mag m1 ?=99.99 Stroemgren m1 color index 92- 99 F8.4 mag e_m1 ?=9.99 error in m1 100-108 F9.3 mag c1 ?=99.99 Stroemgren c1 color index 109-116 F8.4 mag e_c1 ?=9.99 error in c1 117-125 F9.3 mag Hb ?=99.99 Stroemgren Hbeta color index 126-133 F8.4 mag e_Hb ?=9.99 error in Hbeta 135-136 A2 --- Mem [M NM] Membership label
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Sequential identification number 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 18 F6.3 s RAs Right ascension (J2000) 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 30 F5.2 arcsec DEs Declination (J2000) 32- 36 I5 --- Zhao ?=0 Zhao et al. 1993, Cat. J/A+AS/100/243, number, CL* NGC 2682 ZTP NNNN in Simbad 38- 42 I5 --- BDA ?=0 BDA identification number 44- 49 A6 --- San Sanders (1977A&AS...27...89S) identification number 50- 55 I6 --- HIP ?=0 Hipparcos (I/239) identification number 57- 61 I5 --- TYC1 ?=0 TYC1 (I/239) identification number 63- 67 I5 --- TYC2 ?=0 TYC2 (I/259) identification number 68- 82 A15 --- USNO2 USNO2 (I/252) identification number
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Zhao Zhao et al (1993, Cat. J/A+AS/100/243) number, CL* NGC 2682 ZTP NNNN in Simbad 6- 11 A6 --- San Sanders (1977A&AS...27...89S) identification number, Cl* NGC 2682 Sand NNNNa in Simbad 13- 17 F5.2 mag Bmag Photographic B magnitude (1) 19- 23 F5.2 mag Vmag ? Photographic V magnitude (1) 25- 30 F6.1 mas/yr pmX Proper motion in x 32- 35 F4.1 mas/yr e_pmX error in PMx 37- 42 F6.1 mas/yr pmY Proper motion in y 44- 47 F4.1 mas/yr e_pmY error in PMy 49- 53 F5.2 --- MembP Parametric membership probability 55- 59 F5.2 --- MembNP Non-parametric membership probability 61- 62 I2 --- Nplates Number of plates
Note (1): Magnitudes from Sanders (1977A&AS...27...89S)
Acknowledgements: Lola Balaguer-Nunez, lola.balaguer(at)am.ub.es
(End) L. Balaguer-Nunez [Univ. de Barcelona], P. Vannier [CDS] 10-May-2007
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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