J/AJ/139/1801 XY UMa BVRI light curves (Yuan, 2010)
Period variation and asymmetry light curves of XY Ursae Majoris.
Yuan J.
<Astron. J., 139, 1801-1807 (2010)>
=2010AJ....139.1801Y 2010AJ....139.1801Y
ADC_Keywords: Binaries, eclipsing ; Photometry, CCD ; Photometry, UBVRI
Keywords: binaries: close - stars: individual (XY UMa) - stars: magnetic field -
starspots
Abstract:
New CCD photometric observations of the chromospherically active
binary XY Ursae Majoris (XY UMa) were obtained every year since 2006.
The light curves obtained in the late Spring of 2006 show obvious
variations on a short timescale, while the light curves obtained in
2008 December do not. But both sets of light curves are markedly
asymmetric, and were analyzed using the 2003 version of the
Wilson-Devinney code with spot model. New absolute physical parameters
are obtained.
Description:
CCD photometric observations were carried out in four consecutive
years (2006-2009) using the 100cm reflecting telescope at Yunnan
Observatory in China, and the 60cm telescope and 85cm telescope at
the Xinglong Station of National Astronomical Observatory of China
(NAOC). During the observations in 2006 and 2008, the Johnson BVI or
BVRI filters were used simultaneously, while only the V filter was
used in 2007 and 2009.
Objects:
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RA (2000) DE Designation(s)
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09 09 55.94 +54 29 17.7 XY UMa = HD 237786
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 23 2442 BVRI photometry of XY UMa
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 A1 --- Filt [BVRI] Filter used in the observation
3- 15 F13.5 d HJD Heliocentric Julian Date
17- 23 F7.4 mag Dmag XY UMa and comparison star magnitude difference
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 24-May-2012