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J/PASP/121/104 BVRI differential photometry of GW Gem (Lee+, 2009)
The following files can be converted to FITS (extension .fit or fit.gz)
table1.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/PASP/121/104
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Beginning of ReadMe :J/PASP/121/104 BVRI differential photometry of GW Gem (Lee+, 2009)
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Photometric properties of the near-contact binary GW Geminorum.
Lee J.W., Kim S.-L., Lee C.-U., Kim H.-I., Park J.-H., Park S.-R., Koch R.H.
<Publ. Astron. Soc. Pac., 121, 104-110 (2009)>
=2009PASP..121..104L
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ADC_Keywords: Stars, double and multiple ; Photometry, CCD ; Photometry, UBVRI
Abstract:
New multiband CCD photometry is presented for the eclipsing binary
GW Gem; the RI light curves are the first ever compiled. Four new
minimum timings have been determined. Our analysis of eclipse timings
observed during the past 79 years indicates a continuous period
increase at a fractional rate of +(1.2+/-0.1)x10^10^, in excellent
agreement with the value +1.1x10^-10^ calculated from the
Wilson-Devinney binary code. The new light curves display an inverse
O'Connell effect increasing toward longer wavelengths. Hot- and
cool-spot models are developed to describe these variations but we
prefer a cool spot on the secondary star. Our light-curve synthesis
reveals that GW Gem is in a semidetached, but near-contact,
configuration. It appears to consist of a near-main-sequence primary
star with a spectral type of about A7 and an evolved early K-type
secondary star that completely fills its inner Roche lobe. Mass
transfer from the secondary to the primary component is responsible
for the observed secular period change.
Description:
Our CCD photometry of GW Gem was performed on 13 nights during the
period 2007 December 20-2008 March 1 in order to obtain multicolor
light curves. The observations were taken with a SITe 2K CCD camera
and a BVRI filter set attached to the 61-cm reflector at Sobaeksan
Optical Astronomy Observatory (SOAO) in Korea.
Objects:
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RA (2000) DE Designation(s)
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07 52 29.0 +27 09 16 GW Gem = V* GW Gem
07 53 05.5 +27 16 55 2MASS J07530545+2716551 = UCAC2 41361532
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