Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-10-19
The Astronomical Journal, Volume 138, Issue 5, pp. 1508-1519 (2009)
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Published in AJ, 34 pages, 12 figures
Scientific paper
10.1088/0004-6256/138/5/1508
We present a catalogue of variable stars in the near-infrared wavelength detected with overlapping regions of the 2MASS 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 6 are already-known and 118 are distributed in |b| < 5 region. Additionally, 84 variable stars have optical counterparts in DSS images. The three diagrams (colour-magnitude, light variance and colour-colour diagrams) indicate that most of the detected variable stars should be largeamplitude 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.
Kouzuma Shinjirou
Yamaoka Hitoshi
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