Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 93 27 Star positions (from Simbad) lc/* 74 27 Individual light curves
See also: : WEBDA Home Page : mCPod Home Page Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: lc/*
Bytes Format Units Label Explanations
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
Acknowledgements: Ernst Paunzen, ernst.paunzen(at)
(End) Patricia Vannier [CDS] 02-Dec-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service