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J/AJ/138/1508       2MASS large-amplitude variable stars     (Kouzuma+, 2009)
Properties of large-amplitude variable stars detected with
Two Micron All Sky Survey public images.
    Kouzuma S., Yamaoka H.
   <Astron. J., 138, 1508-1519 (2009)>
   =2009AJ....138.1508K
ADC_Keywords: Stars, variable ; Infrared sources ; Photometry, infrared

Keywords: stars: AGB and post-AGB - stars: variables: other - Galaxy: bulge -
          Galaxy: structure

Abstract:
    We present a catalog of variable stars in the near-infrared wavelength
    detected with overlapping regions of the Two Micron All Sky Survey
    public images, and discuss their properties. The investigated region
    is in the direction of the Galactic center (-30°≲l≲20, |b|≲20),
    which covers the entire bulge. We have detected 136 variable stars, of
    which six are already known and 118 are distributed in the |b|<5°
    region. Additionally, 84 variable stars have optical counterparts in
    Digitized Sky Survey images. The three diagrams (color-magnitude,
    light variance, and color-color diagrams) indicate that most of the
    detected variable stars should be large-amplitude and long-period
    variables such as Mira variables or OH/IR stars. The number density
    distribution of the detected variable stars implies that they trace
    the bar structure of the Galactic bulge.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        87      136   List of 2MASS variables


See also:
    II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)


Byte-by-byte Description of file: table1.dat

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     Seq       Sequential number <[KY2009] NNN> in Simbad
   5-  6  I2    h       RAh       Right Ascension J2000 (hours)
   8-  9  I2    min     RAm       Right Ascension J2000 (minutes)
  11- 14  F4.1  s       RAs       Right Ascension J2000 (seconds)
      16  A1    ---     DE-       Declination J2000 (sign)
  17- 18  I2    deg     DEd       Declination J2000 (degrees)
  20- 21  I2    arcmin  DEm       Declination J2000 (minutes)
  23- 26  F4.1  arcsec  DEs       Declination J2000 (seconds)
  28- 33  F6.3  mag     Jmag      2MASS J magnitude
  35- 40  F6.3  mag     Hmag      2MASS H magnitude
  42- 47  F6.3  mag     Kmag      2MASS Ks magnitude
  49- 54  F6.4  mag     AK        Extinction at Ks-band
  56- 59  F4.2  mag     dJmag     ?=- Light variance between two epoch
                                      measurements
  61- 63  I3    d       dEp       Interval between two epochs (days)
  65- 74  F10.6 deg     GLON      [-90/90] Galactic longitude
  76- 85  F10.6 deg     GLAT      Galactic latitude
      87  I1    ---     OC        [0/1] Optical counterpart in DSS images:
                                        0=none can be seen, 1=coutnerpart seen


Acknowledgements:
    S. Kouzuma, skouzuma(at)lets.chukyo-u.ac.jp
(End)                                      Patricia Vannier [CDS]    06-Sep-2011