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J/ApJ/562/337 High proper-motion stars from MACHO astrometry (Alcock+, 2001)
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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
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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 deg^2^, 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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Note (1): Notes:
a: In proper-motion pair
b: Accurate proper motion determined
c: Object in foreground of SMC
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 K_s_ 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 K_s_ magnitude
57- 65 A9 --- SpType Preliminary Spectral type classification
67 A1 --- n_SpType [a] a: spectrum is blended
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History:
From electronic version of the journal
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(End) James Marcout, Patricia Bauer [CDS] 22-Jan-2002