J/AJ/144/167 Photometry and spectroscopy of CF Tauri (Lacy+, 2012)
Absolute properties of the triple star CF Tauri.
Lacy C.H.S., Torres G., Claret A.
<Astron. J., 144, 167 (2012)>
=2012AJ....144..167L 2012AJ....144..167L
ADC_Keywords: Binaries, eclipsing ; Radial velocities ; Photometry, UBV ;
Photometry, CCD
Keywords: binaries: eclipsing - binaries: spectroscopic -
stars: fundamental parameters - stars: individual: CF Tau
Abstract:
CF Tau is now known to be an eclipsing triple star with relatively
deep total and annular eclipses. New light and radial velocity curves
as well as new times of minima were obtained and used for further
modeling of the system. Very accurate (better than 0.9%) masses and
radii of the eclipsing pair are determined from analysis of the two
new light curves, the radial velocity curve, and the times of minimum
light. The mass and luminosity of the distant third component is
accurately determined as well. Theoretical models of the detached,
evolved eclipsing pair match the observed absolute properties of the
stars at an age of about 4.3Gyr and [Fe/H]=-0.14.
Description:
Spectroscopic observations of CF Tau were obtained at the
Harvard-Smithsonian Center for Astrophysics (CfA) using nearly
identical spectrographs on the 1.5m Tillinghast reflector at the F.L.
Whipple Observatory (Mount Hopkins, AZ), and on the 4.5m equivalent
Multiple Mirror Telescope (also on Mount Hopkins), prior to its
conversion to a monolithic 6.5m telescope. A total of 56 usable
observations were obtained from 1985 December to 2009 January at a
resolving power of approximately R=35000.
Two independent telescopes were used to measure the brightness of the
eclipsing binary star, the URSA WebScope and the NF/Observatory (NFO)
WebScope. The URSA WebScope consists of a Meade 10inch f/6.3 LX-200
telescope with a Santa Barbara Instruments Group ST8 CCD camera inside
a Technical Innovations Robo-Dome. This observatory is located atop
Kimpel Hall on the University of Arkansas campus. A Bessell V filter
was used for all observations. The NFO WebScope is a refurbished
24inch Group 128 Cassegrain reflector with a 2K*2K Kodak CCD camera,
located near Silver City, NM (observations through a Bessel V filter).
Objects:
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RA (2000) DE Designation(s) (Period)
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04 05 10.13 +22 29 48.2 CF Tauri = BD+22 628 (P=2.75587690)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 81 56 Radial velocity measurements for CF Tau
table2.dat 52 38 Times of eclipse for CF Tau
table4.dat 18 8052 URSA differential photometry of CF Tau
(URSA WebScope at Kimpel Observatory, Arkansas)
table5.dat 18 5013 NFO differential photometry of CF Tau
(NFO WebScope near Silver City, New Mexico)
refs.dat 71 20 References
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See also:
V/128 : Chromospherically Active Binaries. Third version (Eker+, 2008)
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
B/sb9 : 9th Catalogue of Spectroscopic Binary Orbits (Pourbaix+ 2004-2013)
J/A+A/537/A117 : Velocity curves of SW CMa and HW CMa (Torres+, 2012)
J/AJ/142/185 : Properties of the eclipsing binary stars HY Vir (Lacy+, 2011)
J/AJ/139/2347 : CO And Vr light curves and RV curve (Lacy+, 2010)
J/AJ/138/1622 : Absolute properties of LV Her (Torres+, 2009)
J/ApJ/640/1018 : Differential photometry of V1061 Cyg (Torres+, 2006)
J/AJ/130/2838 : Velocity and light curves of RW Lac (Lacy+, 2005)
J/AJ/128/1340 : Properties of the EB star V459 Cas (Lacy+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 yr Year [1985.98/2009.05] Year
9- 18 F10.4 d HJD Heliocentric Julian Date (HJD-2400000)
20- 26 F7.4 d dt Correction applied to the dates of observation
for light-travel time in the outer orbit
(Δt)
28- 33 F6.4 --- IPhase [0/1] Inner phase
35- 40 F6.4 --- OPhase [0/1] Outer phase
42- 48 F7.2 km/s RVAa [-122.87/97.02] Primary radial velocity (G1)
50- 56 F7.2 km/s RVAb [-129.27/93.27] Secondary radial velocity (G1)
58- 63 F6.2 km/s RVB [-38.2/-2.67] Tertiary radial velocity (G1)
65- 69 F5.2 km/s O-CAa [-6.08/7.65] Primary (O-C) residual (G1)
71- 75 F5.2 km/s O-CAb [-4.54/3.91] Secondary (O-C) residual (G1)
77- 81 F5.2 km/s O-CB [-3.3/1.69] Tertiary (O-C) residual (G1)
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 yr Year [1989.92/2011.84] Year
9- 18 F10.4 d HJD Heliocentric Julian Date (HJD-2400000)
20- 25 F6.4 d e_HJD Uncertainty in HJD (1)
27- 33 F7.1 --- E Cycle number (2)
35 I1 --- T [1/2] Eclipse type (1=deeper eclipse of the
hotter component Ab; 2=eclipse of the cooler
component Aa) (G1)
37- 41 A5 --- Meth Observational method (pe=photoelectric, ccd
or ROTSE)
43- 49 F7.4 d O-C Residuals from our combined orbital fit
51- 52 I2 --- Ref [1/20] Reference; in refs.dat file
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Note (1): Internal errors reported here as published, but were re-scaled in our
orbital solution as described in Section 2.
Note (2): Refers to the reference time of eclipse of the hotter star (Ab) in
table 3 (Tmin(Ab)(HJD)=2454708.90707±0.00066).
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Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d HJD Heliocentric Julian Date (HJD-2400000)
13- 18 F6.3 mag DVmag Differential V band magnitude
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode Bibliographic code
24- 40 A17 --- Aut Author's name
42- 71 A30 --- Com Comments
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Global notes:
Note (G1): The eclipsing components will be denoted Aa (the more massive,
cooler, and larger eclipsing star), Ab (the less massive, hotter,
and smaller eclipsing star), and the distant third component will
be referred to as star B.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 20-Dec-2013