J/A+AS/143/409 Stock 2 CCD photometry and proper motions (Foster+, 2000)
CCD photometry and proper motions of late-type stars in the
young open cluster Stock 2.
Foster D.C., Theissen A., Butler C.J., Rolleston W.R.J., Byrne P.B.,
Hawley S.L.
<Astron. Astrophys. Suppl. Ser. 143, 409 (2000)>
=2000A&AS..143..409F 2000A&AS..143..409F
ADC_Keywords: Clusters, open ; Stars, late-type ; Photometry, CCD ;
Photometry, UBVRI ; Proper motions
Keywords: stars: evolution - stars: late-type -
open clusters: individual: Stock 2
Abstract:
We present the results of the first CCD BVRI photometric and proper
motion study of late-type stars in the young open cluster Stock 2.
Twenty-one fields of approximately 5'x5' size have been observed
photometrically, from which we have identified 118 candidate members
based on their positions on colour-magnitude diagrams relative to
theoretical isochrones. From a comparison of the known star density of
the Pleiades, we estimate the contamination of this selection process
due to background stars to be as large as ∼50%. However, only 22 of
those 118 candidate members have proper motions consistent with
membership, suggesting that the contamination is of the order of 80%.
Additional candidate members were found by means of a proper motion
analysis of Schmidt plate material for a 3°x3{ deg} field
containing the cluster. The cluster proper motion allows us to
separate members from background and foreground stars. We have found
634 stars with a membership probability ≥50% down to a limiting
magnitude of B≃20, corresponding to late-M dwarfs at the distance of
Stock 2.
Objects:
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RA (2000) DE Designation(s)
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02 15 00 +59 16.0 Stock 2
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 49 634 Photographic photometry and proper motions of
Stock 2 stars with a membership probability
greater or equal than 50%, based on the proper
motion analysis
appendix.dat 52 4078 Complete list of CCD photometry
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
26- 30 F5.2 mag Bmag B photographic magnitude
32- 35 F4.2 mag B-R B-R photographic colour
38- 42 F5.1 mas/yr pmx Proper motion in x (1)
45- 49 F5.1 mas/yr pmy Proper motion in y (1)
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Note (1): x and y refers to the plate coordinates
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Byte-by-byte Description of file: appendix.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
26- 31 F6.3 mag Vmag Johnson V magnitude
33- 38 F6.3 mag B-V Johnson B-V colour
40- 45 F6.3 mag V-I Johnson V-I colour
47- 52 F6.3 mag R-I Johnson R-I colour
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Acknowledgements: Armin Theissen
(End) Patricia Bauer [CDS] 02-May-2000