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.
<Mon. Not. R. Astron. Soc., 364, 117-125 (2005)>
=2005MNRAS.364..117M 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 6x105. 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 90 1968 Mira variables
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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
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Bytes Format Units Label Explanations
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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 II/246 designation (HHMMSSss+DDMMsss)
26- 42 A17 --- MSX6C MSX6C V/114 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 <Imag> 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
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Note (1): Objects identified as OGLEII DIA BUL-SCNN NNNN in Simbad
Note (2): Small Theta indicates regular variation and a
well-characterized period
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Acknowledgements: Noriyuki Matsunaga, matsunaga(at)ioa.s.u-tokyo.ac.jp
(End) Patricia Vannier [CDS] 04-May-2006