J/other/NewA/53.39 BVRI light curves of GR Boo (Wang+, 2017)
Multi-band photometric study of the short-period eclipsing binary GR Boo.
Wang D., Zhang L., Han X.L., Lu H.
<New Astron., 53, 39-43 (2017)>
=2017NewA...53...39W 2017NewA...53...39W (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: stars: binaries: eclipsing - stars: individual - GR Boo -
stars: period variation
Abstract:
We present BVRI light curves with complete phase coverage for the
short-period (p=0.377day) eclipsing binary star GR Boo. We carried
out the observations using the SARA 90cm telescope located at Kitt
Peak National Observatory. We obtained six new light curve minimum
times. By fitting all of the available O-C minimum times, we obtained
an updated ephemeris that shows the orbital period of GR Boo is
decreasing at a rate of dP/dt=-2.36x10-7days/year. This decrease in
its period can be explained by either mass transfer from the more
massive component to the less massive one, or angular momentum
exchange due to magnetic activities. We also obtained a set of revised
orbital parameters using the Wilson & Devinney program. And finally,
we concluded that GR Boo is a contact binary with a dark spot.
Description:
We observed the eclipsing binary GR Boo on May 12, 22 and 24 in 2015
using the SARA 90-cm telescope located at Kitt Peak National
Observatory, Arizona, USA. This telescope was equipped with an ARC CCD
camera with a resolution of 2048x2048pixels but used at 2x2 binning,
resulting in 1024x1024pixels. We used the Bessel BVRI filters.
Objects:
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RA (2000) DE Designation(s)
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14 59 54.55 +25 54 33.6 GR Boo = V* GR Boo
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 80 936 Photometric data of GR Boo
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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- 13 F13.5 d HJD-B ? Heliocentric Julian Date of B band observation
15- 20 F6.3 mag dBmag ? Differential B band magnitude
22- 34 F13.5 d HJD-V Heliocentric Julian Date of V band observation
36- 40 F5.3 mag dVmag Differential V band magnitude
42- 54 F13.5 d HJD-R ? Heliocentric Julian Date of R band observation
56- 60 F5.3 mag dRmag ? Differential R band magnitude
62- 74 F13.5 d HJD-I ? Heliocentric Julian Date of I band observation
76- 80 F5.3 mag dImag ? Differential I band magnitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Nov-2017