CDROM/AJ/V106/P1524 Proper Motions in M5 (Rees 1993) ================================================================================ New Proper Motions in the Globular Cluster M5 Richard F. Rees, Jr. <1993, AJ, 106, 1524> =1993AJ....106.1524R ================================================================================ Abstract: New proper motions have been derived from reductions of PDS microdensitometer scans of 17 Yerkes refractor plates spanning an epoch range of 88 years for 515 stars down to V ~ 15.6 in the region of the globular cluster M5. Photographic photometry in B and V has been obtained for these stars from these scans and scans of six Yerkes reflector plates. The present proper motions have significantly improved precision compared to Cudworth [AJ, 84, 1866 (1979)]. Membership probabilities derived from the new proper motions are largely in agreement with those from Cudworth's study, but this paper includes nearly 200 additional stars, many of which are probable members. A color-magnitude diagram of probable members is presented and discussed, as well as comparisons to previous photometry. All but two of the previously known or suspected variables are found to be highly probable members. These proper motions have been used by Cudworth & Hanson [AJ, 105, 168 (1993)] to derive a large space velocity for M5, implying that it is a rich outer halo cluster on an eccentric orbit near perigalacticon. These motions will be used in a forthcoming paper to explore the internal dynamics of M5, including a derivation of the cluster distance by comparison of the proper motion and radial velocity dispersions. File Summary: -------------------------------------------------------------------------------- File Name Lrecl Records Explanations -------------------------------------------------------------------------------- table3.dat 73 515 M5 positions, proper motions, photometry, and membership probabilities -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1-20 A20 --- Star *Star identifications 21-27 F7.1 arcsec X *X offset from cluster center 28-34 F7.1 arcsec Y *Y offset from cluster center 35-41 I7 10-6arcsec/yr PM_X Relative proper motion in X 42-45 I4 10-6arcsec/yr e_PM_X Error in PM_X 46-52 I7 10-6arcsec/yr PM_Y Relative proper motion in Y 53-56 I4 10-6arcsec/yr e_PM_Y Error in PM_Y 57-63 F7.2 mag V V magnitude 64-69 F6.6 mag B-V B-V color 70-73 I4 % Prob Membership probability -------------------------------------------------------------------------------- Notes for file: table3.dat -------------------------------------------------------------------------------- Star: Star identifications References: --------------------------- ---------------------------------- B Barnard, 1931, Publ. Yerkes Obs., Vol. 6 Lowercase letter (with no Arp, 1955a, AJ, 60, 1 number following) Roman numeral followed by a Arp, 1955b, AJ, 60, 317, and the dash extension of Arp's system by Buonanno et al. 1981, MNRAS, 196, 435 Uppercase letter (with no Arp, 1962, ApJ, 135, 311 number following) or Roman numeral with no dash Z Zhukov 1971, Trudy Pulkova Obs., Ser. 2, 78, 160 ZNG UV-bright star from Zinn et al. 1972, A&A, 18, 390 V Variable star from Sawyer Hogg 1973, Publ. David Dunlap Obs., Vol. 3, No. 6 C Cudworth 1979, AJ, 84, 1866 S Sanduleak 1989, 1989, ApJS, 71, 713 R This study X,Y: Offset from cluster center and aligned close to R.A. and Dec. (equator & equinox 1950, epoch 1975) -------------------------------------------------------------------------------- ================================================================================ (End) Lee Brotzman [ADS] 18-Mar-1995