CDROM/AJ/V105/P1822 Clusters Near Eta Car (Cudworth+ 1993) ================================================================================ Proper Motions, Membership, and Photometry of Open Clusters Near Eta Carinae Kyle M. Cudworth, Steven C. Martin, & Kathleen DeGioia-Eastwood <1993, AJ, 105, 1822> =1993AJ....105.1822C ================================================================================ Abstract: Proper motions and photographic photometry have been derived for nearly 600 stars with 7.5 < V < 15.5 in the region of the very young open clusters Tr 14, Tr 16, and Cr 232 based on 26 plates dating from 1893 to 1990. Cluster membership probabilities have been derived from the proper motions and color-magnitude diagrams of probable members of each cluster are presented. In contrast to a few of the previous studies we find all three clusters to lie at the same distance. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table3.dat 66 577 Positions, proper motions, photometry, and membership probabilities -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- Star *Star identification number 9-16 F8.1 arcsec X *X coordinate 17-24 F8.1 arcsec Y *Y coordinate 25 1X --- --- Blank 26-32 I7 0.01mas/yr pmX Relative proper motion in X 33-36 I4 0.01mas/yr e_pmX Error in pmX 37-43 I7 0.01mas/yr pmY Relative proper motion on Y 44-47 I4 0.01mas/yr e_pmY Error in pmY 48-49 2X --- --- Blank 50-55 F6.2 mag V V magnitude 56-61 F6.2 mag B-V B-V color 62-66 I5 % Memb Calculated membership probability -------------------------------------------------------------------------------- Notes for file: table3.dat -------------------------------------------------------------------------------- Star: Star identification number, FA: Feinstein et al. (1973, A&AS, 12, 331), FB: Feinstein (1982, AJ, 87, 1012), HD: Henry Draper Catalogue, Y: This study X, Y: This coordinate system is aligned with right ascension and declination of equator and equinox 1950, but positions are epoch 1975. The zero point of these offsets is star Y1 (V=12.82) which lies at 10:42:32.87 -59:20:29.0 (equator and equinox 1950) -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 06-Mar-1995