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 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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables.dat 138 255 Data for NGC 752 (tables 1 and 2 of the paper)
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Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): Plat: Platais, 1991A&AS...87...69P 1991A&AS...87...69P, Cl* NGC 752 PLA NNN
Ebbi: Ebbighausen, 1939ApJ....89..431E 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 1989AJ.....98..888F, CL* NGC 752 FRAN NNN
Psh: Pilachowski et al., 1988PASP..100..471P 1988PASP..100..471P
Rv: Rohlfs & Vanysek, 1961AAHam...5..343R 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
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Acknowledgements:
It is a pleasure to thank Bruce Twarog
who kindly provided the data.
(End) Francois Ochsenbein [CDS] 07-Jan-1997