J/ApJ/691/1400 Absolute properties of CM Dra (Morales+, 2009)
Absolute properties of the low-mass eclipsing binary CM Draconis.
Morales J.C., Ribas I., Jordi C., Torres G., Gallardo J., Guinan E.F.,
Charbonneau D., Wolf M., Latham D.W., Anglada-Escude G., Bradstreet D.H.,
Everett M.E., O'Donovan F.T., Mandushev G., Mathieu R.D.
<Astrophys. J., 691, 1400-1411 (2009)>
=2009ApJ...691.1400M 2009ApJ...691.1400M
ADC_Keywords: Binaries, eclipsing ; Photometry, RI ; Radial velocities
Keywords: binaries: eclipsing - binaries: spectroscopic - stars: late-type -
stars: fundamental parameters - stars: individual (CM Dra)
Abstract:
In this paper, we present a complete reanalysis of the eclipsing
systems, CM Dra, composed of two dM4.5 stars. New and existing light
curves as well as a radial velocity curve are modeled to measure the
physical properties of both components. The masses and radii
determined for the components of CM Dra are M1=0.2310±0.0009M☉,
M2=0.2141±0.0010M☉, R1=0.2534±0.0019R☉, and
R2=0.2396±0.0015R☉. With relative uncertainties well below
the 1% level, these values constitute the most accurate properties to
date for fully convective stars.
Description:
The photometric data available for CM Dra come from a variety of
sources. In addition to making use of the original light curve in the
I band published by Lacy (1977ApJ...218..444L 1977ApJ...218..444L), six new light curves
measured in the Ic and Rc bands have been obtained with the 0.8m Four
College Automatic Photoelectric Telescope (FCAPT) located at Fairborn
Observatory in southern Arizona in the Patagonia Mountains.
Differential photoelectric photometry was conducted from 1995-2005 on
335 nights. An additional light curve in the r band was gathered with
the Sleuth telescope located at the Palomar Observatory in southern
California, from UT 2004 March 29 to UT 2004 June 6. Collectively
these light curves cover the observing seasons 1975, 1996-2001, and
2004, and add up to more than 20000 individual measurements.
For the spectroscopic material, we reanalyzed the one discussed in
Metcalfe et al. (1996ApJ...456..356M 1996ApJ...456..356M), obtained over a period of
nearly 5 years with an echelle spectrograph on the 1.5m Tillinghast
reflector at the F. L. Whipple Observatory (Mount Hopkins, Arizona).
Objects:
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RA (2000) DE Designation(s)
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16 34 20.4 +57 09 44 V* CM Dra = IDS 16325+5721 A = SBC9 912
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 23 11364 Differential R- and I-band photometry for CM Dra
from 0.8m Four College Automatic Photoelectric
Telescope (FCAPT)
table2.dat 28 8302 Differential r-band photometry for CM Dra from
Sleuth telescope
table4.dat 38 233 Radial velocity measurements for CM Dra in the
heliocentric frame
table7.dat 43 200 Photoelectric and CCD eclipse timings for CM Dra
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See also:
J/A+A/374/164 : BH Cas VRI differential magnitudes (Zola+, 2001)
J/A+A/387/850 : Radial velocities of eclipsing binaries (Imbert, 2002)
J/other/IBVS/5438 : 162-nd list of minima of eclipsing binaries (Diethelm,
2003)
J/AJ/135/850 : Properties of eclipsing binaries found in TrES (Devor+,
2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- Band [RI] Bandpass (Cousins R or I filter)
3- 15 F13.5 JD HJED Heliocentric Julian date (TT) (G1)
17- 23 F7.4 --- dmag Differential FCAPT band magnitude
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 JD HJED Heliocentric Julian date (TT) (G1)
15- 21 F7.4 --- drmag Differential Sleuth r-band magnitude
23- 28 F6.4 --- e_drmag drmag uncertainty
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 JD HJED Heliocentric Julian date (TT) (G1)
14- 20 F7.2 km/s HRV1 Primary heliocentric radial velocity
22- 25 F4.2 km/s e_HRV1 HRV1 uncertainty
27- 33 F7.2 km/s HRV2 Secondary heliocentric radial velocity
35- 38 F4.2 km/s e_HRV2 HRV2 uncertainty
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 JD HJED Heliocentric Julian date (TT) (G1)
15- 19 F5.1 s (O-C) Observed minus computed residual value for the
primary and secondary minima of CM Dra (1)
21- 24 F4.1 s e_(O-C) (O-C) error
26- 27 A2 --- Type [ I/II] Primary or secondary timing
29- 43 A15 --- Ref Light curve reference(s)
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Note (1): (O-C)j=T0,j+PjE, where T0,j can be taken to represent an
effective epoch of reference for both minima including the effect of
the eccentricity, and Pj plays the role of a period for each type of
minimum. See section 4.1 for further details.
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Global notes:
Note (G1): Dates are given in heliocentric Julian days on the
TT time scale (HJED).
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 24-Feb-2011