J/other/OEJV/149 New Miras in Galactic Bulge (Hummerich+ 2012)
New Mira variables from the MACHO Galactic Bulge Fields
Hummerich S., Bernhard K.
<Open European J. Var. stars 149; BAV Mitteilungen Nr. 227 (2012)>
=2012OEJV..149....1H 2012OEJV..149....1H
ADC_Keywords: Stars, variable
Abstract:
500 new Mira variables in the direction of the Galactic Bulge are
presented, which were found in the MACHO database.
Description:
500 previously unrecorded Mira variables were found during an
inspection of R-band lightcurves from the MACHO Galactic Bulge fields
(http://macho.anu.edu.au/). This research continues the search for new
Miras in the MACHO database (Bernhard, 2011PZP....11...12B 2011PZP....11...12B). The MACHO
1.3m telescope is situated at Mount Stromlo in Australia and uses B
and R filters in combination with eight 2048*2048 CCD cameras.
Calculation of MACHO R magnitudes was done from the given instrumental
R magnitudes using the formula given in Alcock et al.
(1999PASP..111.1539A 1999PASP..111.1539A). Astrometric positions and near-infrared color
indices were derived from the 2MASS catalog (Skrutskie et al. 2006,
VII/233). Only objects with an amplitude >2mag (Rc) were taken into
consideration. In addition, all lightcurves have been inspected
visually; objects with significant changes in amplitude, mean
magnitude and / or period suggesting semi-regularity have been
rejected. Each object was checked against the Strasbourg CDS Vizier
service and the International Variable Star Index (VSX) for
pre-existence as a Mira-type star in variability catalogues. Summary
data for all new Mira variables are listed in Table 1. (:) denotes
uncertain value. Lightcurves, folded lightcurves and further details
are available via AAVSO-VSX (http://www.aavso.org/vsx/).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 102 500 Positions, identifications and photometric data
for new Mira stars
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2013)
http://www.aavso.org/vsx/ : AAVSO-VSX Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/500] Running number
5- 18 A14 --- MACHO MACHO identification
20- 48 A29 --- Name Variable name
50- 51 I2 h RAh Right Ascension J2000 (hours)
53- 54 I2 min RAm Right Ascension J2000 (minutes)
56- 60 F5.2 s RAs Right Ascension J2000 (seconds)
62 A1 --- DE- Declination J2000 (sign)
63- 64 I2 deg DEd Declination J2000 (degrees)
66- 67 I2 arcmin DEm Declination J2000 (minutes)
69- 72 F4.1 arcsec DEs Declination J2000 (seconds)
74 A1 --- l_max [<>] Limit flag on max magnitude
75- 78 F4.1 mag max Magnitude at maximum brightness
79 A1 --- u_max Uncertainty flag (:) on max
80 A1 --- --- [-]
81 A1 --- l_min [<>] Limit flag on min magnitude
82- 85 F4.1 mag min Magnitude at minimum brightness
86 A1 --- u_min Uncertainty flag (:) on min
88- 94 I7 JD Ep(max) Epoch of maximum
97-101 F5.1 d Per Period
102 A1 --- u_Per Uncertainty flag (:) on Period
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History:
From electronic version of the journal
(End) Francois Ochsenbein [CDS] 29-Jan-2013