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J/PASP/106/281      Photometry and radial velocities in NGC752   (Daniel+, 1994)

A photometric and radial-velocity analysis of the intermediate-age open cluster NGC 752. Daniel S.A., Latham D.W., Mathieu R.D., Twarog B.A. <Publ. Astron. Soc. Pac. 106, 281 (1994)> =1994PASP..106..281D
ADC_Keywords: Clusters, open ; Photometry, CCD ; Radial velocities Abstract: Using all available proper-motion and radial-velocity data, including new radial-velocity observations obtained for this investigation, probable members of the open cluster NGC 752 have been identified. Photoelectric data on six systems have been transformed and collated to form an internally consistent sample on the BV system. Binaries have been identified using photometric and radial-velocity data, including a photographic survey for variability and the radial-velocity observations of this study. Analysis of the data leads to the following cluster parameters and their probable errors: E(B-V) = 0.035±0.005mag, Fe/H = -0.15±0.05dex, and (m-M) = 8.25±0.10mag. The spread in color among stars in the color-magnitude diagram (CMD) along the main sequence from the turnoff to the unevolved main sequence is the consequence of a rich population of binaries. Due to its age and the comprehensive data available for the cluster, NGC 752 provides an ideal test of a variety of evolutionary phenomena. Comparison with theoretical isochrones normalized in an internally consistent manner leads to the conclusion that the morphology and distribution of stars in the CMD can best be matched using models that include convective overshoot, particularly those of Schaller et al. (1992A&AS...96..269S). Despite their differences, the traditional and the overshoot isochrones both imply very similar ages, 1.9±0.2Gyr and 1.7±0.1Gyr, respectively, for the cluster. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tables.dat 138 255 Data for NGC 752 (tables 1 and 2 of the paper)
Byte-by-byte Description of file: tables.dat
Bytes Format Units Label Explanations
1- 4 A4 --- ID Designation of the star 6- 7 I2 h RAh Right ascension (J2000.0) 9- 10 I2 min RAm Right ascension (J2000.0) 12- 16 F5.2 s RAs Right ascension (J2000.0) 18 A1 --- DE- Declination sign 19- 20 I2 deg DEd Declination (J2000.0) 22- 23 I2 arcmin DEm Declination (J2000.0) 25- 28 F4.1 arcsec DEs Declination (J2000.0) 30- 35 F6.3 mag Vmag ? V magnitude 37- 41 F5.3 mag e_Vmag ? rms uncertainty on Vmag 43- 44 I2 --- o_Vmag ? Number of observations in Vmag 46- 50 F5.3 mag B-V ? B-V colour index 52- 56 F5.3 mag e_B-V ? rms uncertainty on B-V 58- 59 I2 --- o_B-V ? Number of observations in B-V 61- 64 I4 --- Plat ? Platais (1991) identification number (1) 66- 67 I2 % PlatPR ? Membership probability 69- 71 A3 --- Ebbi Ebbighausen (1939) identification number (1) 72 A1 --- m_Ebbi Multiplicity index on Ebbi 73 I1 --- EbbiMC [1/4]? Membership class (2) 75- 77 I3 --- Cann ? Cannon (1968) identification number (1) 79 A1 --- CannMC [-+] Membership code (3) 81- 83 I3 --- Fran ? Francic (1989a,b) identification number (1) 85- 88 F4.2 --- FranPR ? Membership probability 90- 94 F5.1 km/s RVPsh ? Pilachowski et al. (1988) radial velocity (1) 95 A1 --- n_RVPsh [v] v: variable 97 I1 --- o_RVPsh ? Number of observations for RVPsh 98-102 F5.1 km/s RV ? New radial velocity 103 A1 --- u_RV Uncertainty flag on RV 105-109 F5.1 km/s e_RV ? rms uncertainty on RV 111-112 I2 --- o_RV ? Number of observations for RV 114-116 I3 --- RuID ? Rufener (1981) identification number (1) 118-120 I3 --- RvID ? Rohlfs & Vanysek (1961) identification number (1) 122 A1 --- MC [0±] Final estimate of membership (4) 124-138 A15 --- Note Note (5)
Note (1): Plat: Platais, 1991A&AS...87...69P, Cl* NGC 752 PLA NNN Ebbi: Ebbighausen, 1939ApJ....89..431E, nnn when NGC 752 NNN Ann when Cl* NGC 752 Ebbi ANN Cann: Cannon, 1968, Ph. D. thesis, University of Cambridge Fran: Francic, 1989AJ.....98..888F, CL* NGC 752 FRAN NNN Psh: Pilachowski et al., 1988PASP..100..471P Rv: Rohlfs & Vanysek, 1961AAHam...5..343R, Cl* NGC 752 RV NNN Ru: Rufener 1981 , Geneva photometric catalog, See Cat. II/169 Note (2): 1: definite membership 2: probable membership 3: probable nonmembership 4: definite nonmembership Note (3): +: membership -: nonmembership Note (4): +: probable membership 0: possible membership -: probable nonmembership Note (5): SB1: single-lined system SB2: double-lines system ORB: Orbital elements derived by other ROT: stars whose velocities were derived using computed templates with rotation velocities grater than 30km/s
Acknowledgements: It is a pleasure to thank Bruce Twarog who kindly provided the data.
(End) Francois Ochsenbein [CDS] 07-Jan-1997
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