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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 (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: ----------------------------------------------- RA (2000) DE Designation(s) ----------------------------------------------- 14 59 54.55 +25 54 33.6 GR Boo = V* GR Boo ----------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 80 936 Photometric data of GR Boo
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Nov-2017
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

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