J/AJ/132/960 V(RI)c light-curves of EQ Tauri (Hrivnak+, 2006)
Light-curve study and physical properties of the contact binary EQ Tauri.
Hrivnak B.J., Lu W., Eaton J., Kenning D.
<Astron. J., 132, 960-966 (2006)>
=2006AJ....132..960H 2006AJ....132..960H
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: eclipsing - stars: individual (EQ Tauri)
Abstract:
New V, RC, and IC light curves of EQ Tau have been obtained in
2002 and 2003. These show the secondary minimum to be a total eclipse.
These new light curves have been analyzed, together with the published
radial velocity observations, using the Wilson-Devinney code. The
binary has an overcontact configuration, with an orbital inclination
of 85°, a difference in component temperature of 80K, and an
overcontact fill-out factor of 16%. Absolute parameters of the
component stars have been determined: M1=1.28M☉,
R1=1.17R☉, L1=1.39 L☉, and M2=0.47M☉,
R2=0.81R☉, L2=0.63L☉. The calculated distance is
180±20pc. A critical review of our new timings of minimum light
together with previously published ones suggests a change from one
constant period to another one around 1974 rather than a cyclical
variation. When corrected for energy transfer in the common envelope,
the physical parameters of the two components are in good agreement
with those of unevolved single stars of similar masses.
Objects:
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RA (2000) DE Designation(s)
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03 48 13.4 +22 18 51 EQ Tau = TYC 1260-909-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 356 Differential Magnitudes for EQ Tau from 2002
and 2003
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJDRc ? Heliocentric Julian Date
15- 20 F6.3 mag DelRc ? Differential Magnitude in Cousins R band
24- 35 F12.4 d HJDV Heliocentric Julian Date
38- 43 F6.3 mag DelV Differential Magnitude in Johnson V band
47- 58 F12.4 d HJDIc ? Heliocentric Julian Date
61- 66 F6.3 mag DelIc ? Differential Magnitude in Cousins I band
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Feb-2008