J/A+A/466/1031 Photometry of DE CVn (van den Besselaar+, 2007)
DE CVn: a bright, eclipsing red dwarf - white dwarf binary.
van den Besselaar E.J.M., Greimel R., Morales-Rueda L., Nelemans G.,
Thorstensen R., Marsh T.R., Dhillon V.S., Robb R.M., Balam D.D.,
Guenther E.W., Kemp J., Augusteijn T., Groot P.J.
<Astron. Astrophys. 466, 1031 (2007)>
=2007A&A...466.1031V 2007A&A...466.1031V
ADC_Keywords: Binaries, eclipsing ; Photometry
Keywords: stars: individual: DE CVn - stars: binaries: eclipsing -
stars: binaries: close - stars: late-type - stars: white dwarfs -
stars: fundamental parameters
Abstract:
Close white dwarf-red dwarf binaries must have gone through a
common-envelope phase during their evolution. DE CVn is a detached
white dwarf-red dwarf binary with a relatively short (∼8.7h) orbital
period. Its brightness and the presence of eclipses makes this system
ideal for a more detailed study.
From a study of photometric and spectroscopic observations of DE CVn
we derive the system parameters that we discuss in the framework of
common-envelope evolution.
Description:
These are photometric observations of the eclipsing red dwarf - white
dwarf binary DE CVn. The observations have been taken with a number of
telescopes and instruments between 1997 and 2006. UVic is the
automatic 0.5-meter telescope of the Climenhage Observatory in
Victoria, Canada. DAO is the 1.8-meter telescope of the Dominion
Astrophysical Observatory in Victoria, Canada. MDM is the 1.3-meter
telescope of the Michigan-Dartmouth-MIT Observatory in Arizona.
ULTRACAM has been used on the 4.2-meter William Herschel Telescope to
simultaneously obtain u', g' and i' data. The data is given in
Heliocentric Julian Date, phase and differential magnitude.
Objects:
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RA (2000) DE Designation(s)
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13 26 54.3 +45 32 55 DE CVn = V* DE CVn
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 98 9 List of light curves
uvic_r.dat 35 1109 UVic R (12+21+22+24 April 1997, 02+08 May 1997,
01 Jul 1998, 21 May 2001)
uvic_v.dat 35 39 UVic V (08 May 1997)
uvic_cle.dat 39 965 *UVic clear (10 May 1997, 02 Jun 2001, 05 Apr 2006)
dao_b.dat 35 149 DAO B (26 May 2001, 30 May 2002)
mdm_b.dat 49 709 MDM B (21 Jan 2002, 03 Feb 2003, 19 Jun 2003)
mdm_bg38.dat 52 813 MDM BG38 (24 Jan 2002, 01 Jul 2002)
ultrac_g.dat 51 19977 ULTRACAM g' (22+24+25 May 2003, 04 May 2004)
ultrac_i.dat 51 20090 ULTRACAM i' (22+24+25 May 2003, 04 May 2004)
ultrac_u.dat 51 20240 ULTRACAM u' (22+24+25 May 2003, 04 May 2004)
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Note on uvic_cle.dat: The observations taken on 09 May 1997 and 17 March 2000
are not available electronically.
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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 A12 --- FileName Name of the file containing the ligth curve
14- 18 A5 --- Filt Filter (1)
20- 24 I5 --- Nobs Number of observations
26- 33 A8 --- Inst Instrument used for observation (2)
35- 98 A64 --- Dates Dates of observations
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Note (1): BG38 = Schott Blue-Green filter.
Note (2): Instruments as follows:
UVic = automatic 0.5-m telescope of the Climenhage Observatory
in Victoria, Canada
DAO = 1.8-m telescope of the Dominion Astrophysical Observatory
MDM = 1.3-m telescope of the Michigan-Dartmouth-MIT Observatory
in Arizona
ULTRACAM = ULTRACAM 4.2-m William Herschel Telescope on La Palma
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Byte-by-byte Description of file: uvic*.dat dao_b.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
16- 24 F9.6 --- Phase Orbital phase
27- 33 F7.4 mag dmag Differential magnitude in R,V, clear or
B filter (1)
35- 39 A5 --- Band [RVB clear] Band of the magnitude
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Note (1): For "clear" filter, not all observations use the same
comparison star for the differential magnitudes
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Byte-by-byte Description of file: mdm*.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d HJD Heliocentric Julian Date
17- 25 F9.6 --- Phase Orbital phase
28- 36 F9.6 mag dmag Differential magnitude in B or BG38 filter
40- 47 F8.6 mag e_dmag ?=0 Uncertainty on differential magnitude
49- 52 A4 --- Band [B BG38] Band on the magnitude
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Byte-by-byte Description of file: ultrac*.dat
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Bytes Format Units Label Explanations
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1- 18 F18.10 d HJD Heliocentric Julian Date
20- 28 F9.6 --- Phase Orbital phase
30- 38 F9.6 mag dmag Differential magnitude in u', g' or i' band
41- 48 F8.6 mag e_dmag Uncertainty on differential magnitude
50- 51 A2 --- Band [u' g' i'] Band of the magnitude
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Acknowledgements:
Else van den Besselaar, besselaar(at)astro.ru.nl
(End) Patricia Vannier [CDS] 08-Feb-2007