J/MNRAS/364/117 OGLE2 Mira variables in the Galactic bulge (Matsunaga+, 2005) ================================================================================ Mira variables in the Galactic bulge with OGLE-II data. Matsunaga N., Fukushi H., Nakada Y. =2005MNRAS.364..117M ================================================================================ ADC_Keywords: Stars, variable ; Photometry Keywords: stars: AGB and post-AGB - stars: mass-loss - stars: variables: other - Galaxy: bulge - Galaxy: structure - infrared: stars Abstract: We have extracted a total of 1968 Mira variables from the Optical Gravitational Lensing Experiment II (OGLE-II) data base in the Galactic bulge region. Among them, 1960 are associated with 2 Micron All-sky Survey (2MASS) sources, and 1541 are further identified with Midcourse Space Exploration (MSX) point sources. Their photometric properties are compared with those of Mira variables in the Large and Small Magellanic Clouds. We have found that mass-losing stars with circumstellar matter are reddened such that the colour dependence of the absorption coefficient is similar to that of interstellar matter. We also discuss the structure of the bulge. The surface number density of the bulge Mira variables is well correlated with the 2.2-m surface brightness obtained by the Cosmic Background Explorer (COBE) satellite. Using this relation, the total number of Mira variables in the bulge is estimated to be about 6x10^5^. The logP-K relation of the Mira variables gives their space distribution which supports the well-known asymmetry of the bar-like bulge. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table2.dat 90 1968 Mira variables -------------------------------------------------------------------------------- See also: J/AcA/52/129 : DIA OGLE2 candidate variable stars catalog (Wozniak+ 2002) http://www.astrouw.edu.pl/~ogle/ : OGLE Home Page II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003) Byte-by-byte Description of file: table2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Field Field number (field name is BUL_SCnn) (1) 4- 7 I4 --- Vno Variable number in the field (1) 9- 24 A16 --- 2MASS 2MASS designation (HHMMSSss+DDMMsss) 26- 42 A17 --- MSX6C MSX6C designation (GLLL.llll+bb.bbbb) 44- 49 F6.2 d Per Period 51- 54 F4.2 --- Theta Regularity indicator of variation (2) 56- 59 F4.2 mag DImag Maximun-to-minimum amplitude 61- 65 F5.2 mag Mean I magnitude 66 A1 --- --- [0] 68- 71 F4.2 mag J-Ks ?=0.0 2MASS J-Ks colour index 73- 76 F4.2 mag H-Ks ?=0.0 2MASS H-Ks colour index 78- 82 F5.2 mag Ksmag ?=99.99 2MASS Ks magnitude 84- 88 F5.2 mag [8]mag ?=99.99 MSX A-band (8.28um) magnitude 90 I1 --- Flag [0/1] 1: double detection in the neighbouring fields -------------------------------------------------------------------------------- Note (1): Objects identified as OGLEII DIA BUL-SCNN NNNN in Simbad Note (2): Small Theta indicates regular variation and a well-characterized period -------------------------------------------------------------------------------- Acknowledgements: Noriyuki Matsunaga, matsunaga(at)ioa.s.u-tokyo.ac.jp ================================================================================ (End) Patricia Vannier [CDS] 04-May-2006