J/ApJ/562/337     High proper-motion stars from MACHO astrometry (Alcock+, 2001)

Astrometry with the MACHO data archive. I. High proper motion stars toward the Galactic Bulge and Magellanic clouds. Alcock C., Allsman R.A., Alves D.R., Axelrod T.S., Becker A.C., Bennett D.P., Cook K.H., Drake A.J., Freeman K.C., Geha M., Griest K., Lehner M.J., Marshall S.L., Minniti D., Nelson C.A., Peterson B.A., Popowski P., Pratt M.R., Quinn P.J., Stubbs C.W., Sutherland W., Vandehei T., Welch D.L. <Astrophys. J. 562, 337 (2001)> =2001ApJ...562..337A 2001ApJ...562..337A
ADC_Keywords: Surveys ; Photometry, Cousins ; Photometry, infrared ; Proper motions Keywords: astrometry - catalogs - solar neighborhood - stars: kinematics - stars: low-mass, brown dwarfs Abstract: We present the preliminary results of our astrometric study of stellar motions along the lines of sight of the Magellanic Clouds and the Galactic bulge. Using 5 years of MACHO project point-spread function photometry, we find that we can easily select stars with proper motions of 0.03"/yr from these very dense fields, using the characteristic shapes of their light curves. By performing astrometry on photometrically selected, candidate, high proper motion (HPM) stars in 50 deg2, we have discovered 154 new HPM stars from ∼55 million stars monitored by the MACHO project. These new objects have proper motions as high as 0.5"/yr, brightnesses ranging from V ∼13 to V∼19, and V-R colors between 0.3 and 1.45. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 87 88 Parameters of Galactic bulge foreground stars table2.dat 87 65 Parameters of LMC and SMC foreground stars table3.dat 67 56 Infrared magnitudes of LMC foreground stars -------------------------------------------------------------------------------- See also: J/A+A/313/841 : MACHO LMC No.1 microlensing event (Dominik+, 1996) J/AJ/114/326 : MACHO Variables V. (Alcock+ 1997) J/ApJ/542/257 : MACHO LMC first-overtone RR Lyrae (Alcock+, 2000) Byte-by-byte Description of file: table1.dat table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 14 A14 --- MACHO MACHO identification number 15- 16 A2 --- n_MACHO [abc ] Note (1) 17- 18 I2 h RAh Right ascension (J2000.0) 20- 21 I2 min RAm Right ascension (J2000.0) 23- 28 F6.3 s RAs Right ascension (J2000.0) 30 A1 --- DE- Declination sign (J2000.0) 31- 32 I2 deg DEd Declination (J2000.0) 34- 35 I2 arcmin DEm Declination (J2000.0) 37- 42 F6.3 arcsec DEs Declination (J2000.0) 44- 50 I7 d HJD Epoch of observation 52- 55 F4.1 mag Rmag Baseline Kron-Cousins R magnitude 57- 60 F4.2 mag V-R Baseline Kron-Cousins V-R colour index 62- 65 F4.2 yr Nyr Number of years separating images used in proper-motion determination 67- 71 F5.3 arcsec/yr pm Total proper motion 73- 77 F5.1 deg pmPA Position angle (North to East) of proper motion 79- 87 A9 --- Bands Photometry bands of images used in proper-motion determination -------------------------------------------------------------------------------- Note (1): Notes: a: In proper-motion pair b: Accurate proper motion determined c: Object in foreground of SMC -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 14 A14 --- MACHO MACHO identification number 15- 20 F6.3 mag Jmag2 ? 2MASS J magnitude 22- 27 F6.3 mag Hmag2 ? 2MASS H magnitude 29- 34 F6.3 mag Ksmag2 ? 2MASS Ks magnitude 36- 41 F6.3 mag ImagD ? DENIS I magnitude 43- 48 F6.3 mag JmagD ? DENIS J magnitude 50- 55 F6.3 mag KsmagD ? DENIS Ks magnitude 57- 65 A9 --- SpType Preliminary Spectral type classification 67 A1 --- n_SpType [a] a: spectrum is blended -------------------------------------------------------------------------------- History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 22-Jan-2002
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