J/AJ/136/1089 UBVRI light curves of TU Boo (Coughlin+, 2008)
Long-term photometric analysis of the active W UMa-type system TU Bootis.
Coughlin J.L., Dale III H.A., Williamon R.M.
<Astron. J., 136, 1089-1096 (2008)>
=2008AJ....136.1089C 2008AJ....136.1089C
ADC_Keywords: Binaries, eclipsing ; Photometry, UBVRI
Keywords: binaries: close - binaries: eclipsing - stars: individual (TU Boo)
Abstract:
We present multicolor light curves for the W UMa-type eclipsing binary
TU Boo for two epochs separated by 22 years. An analysis of the O-C
diagram indicates the earlier observations took place right in the
middle of a major period change, thus allowing for a unique study on
mass transfer and period changes in this W UMa-type system. We compute
model fits to our light curves, along with the only other published
set, using the Wilson-Devinney program, and find temporally correlated
changes in the size of the secondary component with anomalies in the
O-C diagram. We investigate the cause of these changes and find
support for the existence of rapid, large-scale mass transfer between
the components.
Description:
For the earlier epoch, Johnson B and V observations were taken with
the 36 inch Cassegrain reflector at the Fernbank Science Center
Observatory in Atlanta, GA during the 1983 and 1984 observing seasons.
For the later epoch, observations in the Johnson U, B, V, R, and I
filters were taken with Lowell Observatory's 42" Hall Telescope and
FLI SITe 2048x2048 CCD camera, cooled by liquid nitrogen to -133C,
over five nights from 2006 April 20 to 24.
Objects:
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RA (2000) DE Designation(s)
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14 04 58.0 +30 00 01 TU Boo = 2MASS J14045804+3000012
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a.dat 23 466 1983-1984 differential photometric data
table1b.dat 23 1169 2006 photometric data
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Byte-by-byte Description of file: table1[ab].dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
15 A1 --- Filt [UBVRI] Filter
17- 23 F7.4 mag mag Differential (table1a) or photometric magnitude
(table1b) in Filt (1)
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Note (1): The data from the 1983 and 1984 observing seasons were made
differentially with respect to a comparison star and corrected for
atmospheric extinction by means of nightly extinction coefficients
determined from the comparison star. Ensemble photometry was performed
on the later epoch observations.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Apr-2011