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J/PASP/114/1382     BVRI photometry of Stock 1 stars         (Osborn+, 2002)

The neglected open cluster Stock 1. Osborn W., Sano Y., Spalding R. <Publ. Astron. Soc. Pac. 114, 1382 (2002) + Erratum 115, 761 (2003)> =2002PASP..114.1382O
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, CCD Abstract: BVRI photometry and J2000.0 positions have been obtained for stars in the field of the open cluster Stock 1. The photometry has been combined with available spectral types and proper motions to investigate cluster membership. We conclude that Stock 1 is a young cluster with a reddening of E(B-V)=0.16±0.04, a distance modulus of V0-MV=7.5±0.1, and an age of 300±50Myr. Description: The lack of attention to Stock 1 can be partially attributed to difficulties with Stock's (1956ApJ...123..258S) finding chart. The cluster lies in a crowded field, and the chart shows only the 158 stars Stock measured, omitting the other stars. It also contains some errors. This has caused problems in identifying stars, particularly the fainter ones. To resolve the ambiguities, we measured the stars' x-y coordinates on a print of Stock's finding chart and then computed equatorial coordinates, using the certain identifications for the reference stars. Comparison of the resulting positions with the United States Naval Observatory (USNO) A2.0 catalog (I/252) along with an examination of the region on the Digitized Sky Survey1 allowed us to identify all but stars 13. Our adopted J2000.0 coordinates for the Stock 1 stars, as well as for a few other stars we observed, are given in Table 1. CCD observations of Stock 1 were obtained with standard BVRI filters on 13 nights in the period 1999 October2000 September. The images were obtained with a 576x384 Star-1 CCD camera on the Brooks Observatory 0.4m f/12 reflector. This system gives a field of view of 11'x8', which generally allowed several Stock stars to be imaged on the same frame. In a few cases, incoming clouds prevented observations of a field with all filters. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 69 161 Positions and photometry table2.dat 17 17 Spalding (1979, M.S. thesis, Central Michigan Univ) photoelectric photometry table3.dat 27 40 Cluster membership
See also: I/252 : The USNO-A2.0 Catalogue (Monet+ 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Seq Sequential number, Cl* Stock 1 S NNNA in Simbad 6- 7 I2 h RAh Right ascension (J2000.0) 9- 10 I2 min RAm Right ascension (J2000.0) 12- 15 F4.1 s RAs Right ascension (J2000.0) 17 A1 --- DE- Declination sign (J2000.0) 18- 19 I2 deg DEd Declination (J2000.0) 21- 22 I2 arcmin DEm Declination (J2000.0) 24- 25 I2 arcsec DEs Declination (J2000.0) 27- 31 F5.2 mag Vmag ? V magnitude 33- 36 F4.2 mag B-V ? B-V colour index 38- 41 F4.2 mag V-R ? V-R colour index 43- 46 F4.2 mag V-I ? V-I colour index 48 I1 --- o_Vmag ? Number of nights of observation 49 A1 --- n_Vmag [T] T: transformed photographic data, only V and B-V are given 51- 54 F4.2 mag e_Vmag ? rms uncertainty on Vmag 56- 59 F4.2 mag e_B-V ? rms uncertainty on B-V 61- 64 F4.2 mag e_V-R ? rms uncertainty on V-R 66- 69 F4.2 mag e_V-I ? rms uncertainty on V-I
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Seq Sequential number 6- 10 F5.2 mag Vmag V magnitude (average error of ±0.03) 12- 15 F4.2 mag B-V B-V colour index (average error of ±0.04) 17 I1 --- o_Vmag Number of nights of observations
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Seq Sequential number 6- 8 A3 --- MCMD Membership class from each of the five criteria of color magnitude diagram position (1) 10- 12 A3 --- ME(B-V) Membership class from reddening(1) 14- 16 A3 --- MV0-MV Membership class from distance modulus (1) 18- 20 A3 --- Mpm Membership class from proper motion (1) 22- 23 A2 --- Mplx Membership from parallax (1) 25- 27 A3 --- Memb Adopted membership classification (1)
Note (1): Membership codes as follows: M = Member (M?: possible member) NM = non-member (NM?: possible non-member) F = Foreground (F?: Possible foreground) B = Background (B?: Possible background)
History: * 06-Feb-2003: From electronic version of the journal * 13-Apr-2007: table1 corrected, from erratum
(End) James Marcout, Patricia Bauer [CDS] 06-Feb-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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