J/A+A/398/239 RI differential photometry of CU Cnc (Ribas, 2003)
The 0.4-M☉ eclipsing binary CU Cnc: Absolute dimensions, comparison with
evolutionary models and possible evidence for a circumstellar dust disk.
Ribas I.
<Astron. Astrophys. 398, 239 (2003)>
=2003A&A...398..239R 2003A&A...398..239R
ADC_Keywords: Binaries, eclipsing ; Photometry, RI
Keywords: binaries: eclipsing - binaries: spectroscopic -
stars: low-mass, brown dwarfs - stars: fundamental parameters -
stars: individual (CU Cnc) - planetary systems: protoplanetary disks
Abstract:
Photometric observations in the R and I bands of the detached M-type
double-lined eclipsing binary CU Cnc have been acquired and analysed.
The photometric elements obtained from the analysis of the light
curves have been combined with an existing spectroscopic solution to
yield high-precision (errors<2%) absolute dimensions:
MA=0.4333±0.0017M☉, MB=0.3980±0.0014M☉,
RA=0.4317±0.0052R☉, and RB=0.3908±0.0094R☉.
The mean effective temperature of the system has been estimated to be
Teff=3140±150K by comparing multi-band photometry with synthetic
colors computed from model atmospheres. Additionally, we have been
able to obtain an estimate for the age (∼320Myr) and chemical
composition ([Fe/H]∼0.0) of the binary system through its membership
of the Castor moving group.
Description:
R and I photoelectric photometry of the CU Cnc eclipsing binary
system. For each measurement heliocentric Julian Date, orbital phase
and differential magnitudes are given. The orbital phases are referred
to the following ephemeris: T(MinI)=HJD2450208.5068+2.771468E
and the differential photometry is relative to the star HD 72093.
Objects:
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RA (2000) DE Designation(s)
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08 31 37.6 +19 23 39 CU Cnc
08 31 41.2 +19 27 39 HD 72093
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 28 2157 R-band differential photometry
table2.dat 28 2188 I-band differential photometry
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
15- 20 F6.4 --- Phase Orbital phase
23- 28 F6.4 mag Dmag Differential magnitude (CU Cnc - HD 72093)
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Acknowledgements: Ignasi Ribas
References:
Torres & Ribas, 2002ApJ...567.1140T 2002ApJ...567.1140T
Absolute Dimensions of the M-Type Eclipsing Binary YY Geminorum
(Castor C): A Challenge to Evolutionary Models in the Lower Main Sequence
(End) Ignasi Ribas [Univ. Barcelona, Spain] 04-Dec-2002