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J/AJ/140/1500 RR Lyrae variables in the central region of M54 (Montiel+, 2010)
The following files can be converted to FITS (extension .fit or fit.gz)
table1.dat table2.dat table3.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/AJ/140/1500
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Beginning of ReadMe :J/AJ/140/1500 RR Lyrae variables in the central region of M54 (Montiel+, 2010)
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A search for RR Lyrae variables in the central region of M54.
Montiel E.J., Mighell K.J.
<Astron. J., 140, 1500-1505 (2010)>
=2010AJ....140.1500M
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ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, HST
Keywords: globular clusters: individual (M54) - methods: statistical -
stars: variables: RR Lyrae - techniques: photometric
Abstract:
We have analyzed archival Hubble Space Telescope (HST) Wide Field
Planetary Camera 2 (WFPC2) observations of the central region of the
globular cluster M54. The 12 irregularly timed observations (6 F555W,
6 F814W) were reduced using the HSTphot stellar photometry package.
Our statistical analysis of the HSTphot photometry yielded 50 variable
stars that are likely RR Lyrae candidates. These candidates were
missed by previous ground-based searches for RR Lyraes due to the
extreme crowding in the core of M54. We performed two checks on our
sample of RR Lyrae candidates to determine how different they were
from the other variable candidates.
Description:
WFPC2 observations of M54 were taken as part of HST Program GO-6701
(PI: Ibata) to study the Sgr field. The first observations, U37GA401R
through U37GA406R consisted of six images in the F814W filter. A
second set of observations, U37GA407R through U37GA40CR, was made up
of six images in the F555W filter.