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. =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{deg}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: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 02 15 00 +59 16.0 Stock 2 ---------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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) -------------------------------------------------------------------------------- Note (1): x and y refers to the plate coordinates -------------------------------------------------------------------------------- Byte-by-byte Description of file: appendix.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Acknowledgements: Armin Theissen ================================================================================ (End) Patricia Bauer [CDS] 02-May-2000