J/A+A/337/125 NGC 1750 & 1758 membership probabilities (Galadi-Enriquez+, 1998)
The overlapping open clusters NGC 1750 and NGC 1758.
III. Cluster-field segregation and clusters physical parameters.
Galadi-Enriquez D., Jordi C., Trullols E.
<Astron. Astrophys. 337, 125 (1998)>
=1998A&A...337..125G 1998A&A...337..125G
ADC_Keywords: Clusters, open ; Photometry, UBVRI
Keywords: open clusters and associations: individual: NGC 1746 -
open clusters and associations: individual: NGC 1750 -
open clusters and associations: individual: NGC 1758 -
stars: luminosity function, mass function - methods: statistical
Abstract:
Cluster-field segregation and determination of physical parameters of
the open clusters NGC 1750 and NGC 1758 were performed from CCD and
photographic photometric and astrometric surveys previously published
by the authors. Membership probabilities were computed to a brightness
limit of R=15mag through a non-standard method in a fully
non-parametric approach, using proper motions, positions and
photometry. This study allowed several parameters for NGC 1750 and NGC
1758 to be determined, including position, size, density profile,
absorption, distance, age, luminosity function and mass. The common
colour excess of both clusters is E(B-V)=0.34mag. NGC 1750 is slightly
younger (log(t)=8.3), closer (V-Mv=9.0mag) and less concentrated
than NGC 1758 (log(t)=8.60 and V-Mv=9.4mag). We also conclude that
NGC 1746 is an erroneous assignation (not corresponding to any real
open cluster), and that NGC 1750 and NGC 1758 are overlapping
clusters, but they do not constitute a gravitationally bounded system.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 79 NGC 1750 members
table2.dat 90 57 NGC 1758 members
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See also:
J/A+A/333/471 : NGC 1750 & NGC 1758 UBVRI photometry (Galadi-Enriquez+ 1998)
J/A+AS/131/239 : NGC 1750 + NGC 1758 BVR photometry (Galadi-Enriquez+ 1998)
J/A+AS/131/89 : NGC 1750 + NGC 1758 proper motions (Tian+ 1998)
Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- GJTGTZ Star identification number
7- 10 F4.2 --- Pk Kinematical membership probability
12- 15 F4.2 --- Ps Spatial membership probability
17- 20 F4.2 --- Pp ? Photometric membership probability
22 I1 h RAh Right ascension, epoch 1994.9 (J2000.0)
24 I1 min RAm Right ascension, epoch 1994.9 (J2000.0)
26- 31 F6.3 s RAs Right ascension, epoch 1994.9 (J2000.0)
33 A1 --- DE- Declination sign (J2000.0)
34- 35 I2 deg DEd Declination, epoch 1994.9 (J2000.0)
37- 38 I2 arcmin DEm Declination, epoch 1994.9 (J2000.0)
40- 44 F5.2 arcsec DEs Declination, epoch 1994.9 (J2000.0)
46- 50 F5.2 mag Bmag B magnitude
52- 56 F5.2 mag Vmag ? V magnitude
58- 62 F5.2 mag Rmag R magnitude
64 A1 --- Source [CP] CCD (C) or photographic (P) photometry
66- 78 A13 --- Name1 Other name
80- 88 A9 --- Name2 Other name
90 A1 --- Note Notes (1)
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Note (1): a: R value is photographic for this star
b: A2e star (McCarthy & Treanor, 1965RA......7..177M 1965RA......7..177M)
c: Assigned by SCM to the field
d: Assigned by SCM to NGC 1758
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History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 05-Oct-1998