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J/A+AS/131/89 NGC 1750 + NGC 1758 proper motions (Tian+ 1998)
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Determination of proper motions and membership of the open clusters
NGC 1750 and NGC 1758.
Tian K.-P., Zhao J.-L., Shao Zh.-Y., Stetson P.B.
<Astron. Astrophys. Suppl. Ser. 131, 89 (1998)>
=1998A&AS..131...89T (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Proper motions
Keywords: open cluster: individual: NGC 1750, NGC 1758 - astrometry
Abstract:
The kinematic state of the open clusters NGC 1750 and NGC 1758 has
been studied using newly determined proper motions for 540 stars in a
field of 1.5{deg}x1.5{deg} in the Taurus dark cloud region. The proper
motions are obtained from the reduction of PDS measurements of 20
plates that span a total time interval of 68 years, resulting in an
average proper motion accuracy of 0.67mas/yr. These proper motions are
used to determine the membership probabilities of stars in the region
by means of a new, improved method described in this paper. Of the 540
stars analyzed here, 332 are found to be probable members of NGC 1750,
and 23 are probable members of NGC 1758. The core radii of NGC 1750
and NGC 1758 are determined to be 17.2' and 2.25' respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 78 540 Proper motions and membership probabilities of
stars in the region of NGC 1750 and NGC 1758
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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)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- TZS98 Sequential number
5- 6 I2 h RAh Right ascension (2000.0)
8- 9 I2 min RAm Right ascension (2000.0)
11- 15 F5.2 s RAs Right ascension (2000.0)
17 A1 --- DE- Declination sign
18- 19 I2 deg DEd Declination (2000.0)
21- 22 I2 arcmin DEm Declination (2000.0)
24- 27 F4.1 arcsec DEs Declination (2000.0)
30- 35 F6.3 mas/yr pmx Relative proper motion in x
38- 43 F6.3 mas/yr pmy Relative proper motion in y
46- 50 F5.3 mas/yr e_pmx rms uncertainty on pmx
52- 56 F5.3 mas/yr e_pmy rms uncertainty on pmy
59- 62 F4.2 --- p1750 Probability that star belongs to NGC 1750
65- 68 F4.2 --- p1758 Probability that star belongs to NGC 1758
71- 74 F4.2 --- Pfield Probability that star belongs to the field
77- 78 I2 --- Nplate Number of plate pairs used in the present study
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Acknowledgements: Tian Kaiping <tkp@center.shao.ac.cn>
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(End) Patricia Bauer [CDS] 01-Sep-1998