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J/other/OEJV/149 New Miras in Galactic Bulge (Hummerich+ 2012)
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Beginning of ReadMe :J/other/OEJV/149 New Miras in Galactic Bulge (Hummerich+ 2012)
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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
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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). 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). 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/).