J/A+A/525/A16 ubvy light curves of CP stars in open clusters (Paunzen+, 2011)
A photometric long-term study of CP stars in open clusters.
Paunzen E., Hensberge H., Maitzen H.M., Netopil M., Trigilio C., Fossati L.,
Heiter U., Pranka M.
<Astron. Astrophys. 525, A16 (2011)>
=2011A&A...525A..16P 2011A&A...525A..16P
ADC_Keywords: Clusters, open ; Stars, variable ; Photometry, uvby
Keywords: stars: chemically peculiar - open clusters and associations: general -
stars: variables: general
Abstract:
Photometric variability of chemically peculiar (CP) stars of the upper
main sequence is closely connected to their local stellar magnetic
field and their rotational period. Long term investigations, as
presented here, help us to identify possible stellar cycles (as in the
Sun). Photoelectric Stroemgren uvby time series for 27 CP stars within
the boundaries of open clusters are presented. Our observations cover
a time period of about six years (1986 to 1992) with typically fifteen
measurements for each objects. These observations help us to determine
the rotational periods of these objects. We established, for the first
time, variability for fourteen CP stars. For additional two stars, a
merging of already published data sets, resulted in more precise
periods, whereas for six objects, the published periods could be
confirmed. Last, but not least, no significant variations were found
for five stars. Apart from six stars, all targets seem to be members
of their host open clusters.
Description:
Photoelectric Stroemgren uvby time series for 27 CP stars are
presented. A standard reduction procedure was applied to the data.
Members of the following open clusters have been observed: Collinder
132, IC 4725, NGC 2516, NGC 3114, NGC 3228, NGC 3532, NGC 5460, NGC
5662, NGC 6281, NGC 6405, and NGC 6475. For each target star the HJD
and the differential uvby magnitudes are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 93 27 Star positions (from Simbad)
lc/* . 27 Individual light curves
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See also:
http://www.univie.ac.at/webda : WEBDA Home Page
http://astro.physics.muni.cz/mcpod : mCPod Home Page
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cluster Cluster name
11- 13 I3 --- W WEBDA star number in cluster
15- 25 A11 --- Name Star name
27- 28 I2 h RAh Simbad Hour of Right Ascension (J2000.0)
30- 31 I2 min RAm Simbad Minute of Right Ascension (J2000.0)
33- 36 F4.1 s RAs Simbad Second of Right Ascension (J2000.0)
38 A1 --- DE- Simbad Sign of the Declination (J2000.0)
39- 40 I2 deg DEd Simbad Degree of Declination (J2000.0)
42- 43 I2 arcmin DEm Simbad Arcminute of Declination (J2000.0)
45- 46 I2 arcsec DEs Simbad Arcsecond of Declination (J2000.0)
48- 52 F5.2 mag Bmag ? Simbad B band magnitude
54- 58 F5.2 mag Vmag ? Simbad V band magnitude
60- 67 A8 --- SpType Simbad MK spectral type
70- 76 F7.5 d Per ? Period (from table1 of the paper)
77 A1 --- u_Per [?] Uncertainty flag on Per
79- 93 A15 --- FileName Name of the file with light curves in
subdirectory lc
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Byte-by-byte Description of file: lc/*
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Bytes Format Units Label Explanations
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2- 10 F9.4 d HJDu HJD-2440000 for u magnitude
12- 17 F6.3 mag Du Differential Stroemgren u
21- 29 F9.4 d HJDv HJD-2440000 for v magnitude
31- 36 F6.3 mag Dv Differential Stroemgren v
40- 48 F9.4 d HJDb HJD-2440000 for b magnitude
50- 55 F6.3 mag Db Differential Stroemgren b
59- 67 F9.4 d HJDy HJD-2440000 for y magnitude
69- 74 F6.3 mag Dy Differential Stroemgren y
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Acknowledgements:
Ernst Paunzen, ernst.paunzen(at)univie.ac.at
(End) Patricia Vannier [CDS] 02-Dec-2010