J/AJ/131/1044 Chromospherically active stars in the Bulge (Drake, 2006)
Chromospherically active stars in the Galactic Bulge.
Drake A.J.
<Astron. J., 131, 1044-1056 (2006)>
=2006AJ....131.1044D 2006AJ....131.1044D
ADC_Keywords: Stars, variable
Keywords: stars: rotation - stars: spots - stars: variables: other
Abstract:
We present the results from the discovery and study of ∼3000
chromospherically active giant and subgiant stars toward the
Galactic bulge.
Description:
The MACHO project repeatedly imaged 67 million stars in a total of 182
observation fields toward the Galactic bulge, the LMC, and the SMC to
detect the phenomenon of microlensing. These images were taken between
1992 and 2000 on the Mount Stromlo and Siding Springs Observatories'
1.3m Great Melbourne Telescope with the 8x20482pixel dual-color
wide-field MACHO camera. In this analysis we concentrate on the
Galactic bulge, where 33,000 observations of ∼33 million stars were
taken in 94 fields. Each observation field covers an area of 43'x43'
on the sky. Most observations toward the Galactic bulge have exposure
times of 150s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 2962 Chromospherically active star data
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See also:
V/76 : Chromospherically Active Binaries (Strassmeier+ 1993)
J/ApJ/562/337 : High proper-motion stars from MACHO astrometry (Alcock+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- MACHO The MACHO identification (1)
17- 18 I2 h RAh Hour of Right Ascension (J2000)
20- 21 I2 min RAm Minute of Right Ascension (J2000)
23- 27 F5.2 s RAs Second of Right Ascension (J2000)
29 A1 --- DE- Sign of the Declination (J2000)
30- 31 I2 deg DEd Degree of Declination (J2000)
33- 34 I2 arcmin DEm Arcminute of Declination (J2000)
36- 39 F4.1 arcsec DEs Arcsecond of Declination (J2000)
41- 45 F5.2 mag Vmag Median V band magnitude during observation period
47- 50 F4.2 mag V-R Median (V-R) color index during observation period
52- 55 F4.2 mag AV Visual extinction from Popwski et al. (2004) map
57- 60 F4.2 mag DelV Maximum V band change during the observing period
62- 65 F4.2 mag DelR Maximum R band change during the observing period
67- 73 F7.3 d Per Rotational period
75 A1 --- Type [abc] Variable type flag (2)
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Note (1): Where the identification sequences is field.tile.sequence.
Note (2): Variable type flag, defined as follows:
a = Possible eclipsing binary;
b = Definite eclipsing binary;
c = Star which may exhibit the flip-flop effect.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 20-Dec-2006