J/AJ/138/1622 Absolute properties of LV Her (Torres+, 2009)
Absolute properties of the highly eccentric eclipsing binary star LV Herculis.
Torres G., Lacy C.H.S., Claret A.
<Astron. J., 138, 1622-1633 (2009)>
=2009AJ....138.1622T 2009AJ....138.1622T
ADC_Keywords: Binaries, eclipsing ; Photometry ; Radial velocities ;
Stars, double and multiple
Keywords: binaries: eclipsing - binaries: spectroscopic - stars: evolution -
stars: fundamental parameters - stars: individual (LV Her)
Abstract:
We report extensive spectroscopic and differential V-band photometric
observations of the 18.4 day detached double-lined eclipsing binary LV
Her (F9V), which has the highest eccentricity (e∼0.613) among the
systems with well-measured properties. We determine the absolute
masses and radii of the components to be M1=1.193±0.010M☉,
M2=1.1698±0.0081M☉, R1=1.358±0.012R☉, and
R2=1.313±0.011R☉, with fractional errors of 0.9% or better.
The effective temperatures are 6060±150K and 6030±150K,
respectively, and the overall metallicity is estimated to be
[m/H]=+0.08±0.21. A comparison with current stellar evolution models
for this composition indicates an excellent fit for an age between 3.8
and 4.2Gyr, with both stars being near the middle of their
main-sequence lifetimes. Full integration of the equations for tidal
evolution is consistent with the high eccentricity, and suggests that
the stars' spin axes are aligned with the orbital axis, and that their
rotations should be pseudo-synchronized. The latter prediction is not
quite in agreement with the measured projected rotational velocities.
Description:
LV Her was observed by the URSA telescope on 156 nights during parts
of nine observing seasons from 2001 February 18 to 2009 April 8. The
total number of URSA observations is 6690. LV Her was observed by a
second robotic telescope at the NF Observatory (NFO), through a
Bessell V filter, on 123 nights during parts of five observing seasons
from 2005 March 1 to 2009 April 24, yielding 2946 observations.
LV Her was placed on the observing list at the Harvard-Smithsonian
Center for Astrophysics (CfA) on 1991 May 31, and was monitored
spectroscopically for exactly 11 years with an echelle instrument on
the 1.5m Tillinghast reflector at the F. L. Whipple Observatory on
Mount Hopkins, Arizona. We collected 42 spectra.
Objects:
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RA (2000) DE Designation(s)
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17 35 32.4 +23 10 31 V* LV Her = TYC 2076-1042-1
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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 6690 *URSA differential V-band magnitudes of LV Her
table2.dat 28 2946 *NFO differential V-band magnitudes of LV Her
table4.dat 50 67 Times of eclipse for LV Her
table5.dat 56 44 Radial velocity measurements of LV Her
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Note on table1.dat, table2.dat: URSA and NFO are robotic telescopes
at Kimpel Observatory, Arkansas.
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2012)
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2011)
B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2010)
V/124 : Approximate elements of eclipsing binaries (Svechnikov+, 1990)
J/other/IBVS/5830 : Minima and maxima of 292 variables (Hubscher+, 2008)
J/MNRAS/378/179 : Eclipsing Binary with Eccentric Orbits Catalog (Bulut+,
2007)
J/A+A/417/263 : Catalogue of Algol type binary stars (Budding+, 2004)
http://var2.astro.cz/EN/brno/eclipsing_binaries.php : Variable Star and
Exoplanet Section of Czech Astronomical Society
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
15- 20 F6.3 mag Vmag Differential V-band magnitude
22- 28 F7.5 --- Phase Orbital phase
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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- 13 F13.5 d HJD Heliocentric Julian Date
15- 23 F9.4 yr Date UT date in decimal year
25 I1 --- Type [1/2] 1: Primary or 2: Secondary
27- 29 A3 --- Inst Intrumentation: ccd, pg (photographic),
or vis (visual)
31- 37 F7.5 d e_HJD Uncertainty in HJD
39- 46 F8.5 d O-C Fit residual
48- 49 I2 --- Ref Reference (2)
50 A1 --- f_Ref [*] *: Remeasurement
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Note (2): Reference as follows:
1 = Torres et al. 2001IBVS.5201....1T 2001IBVS.5201....1T;
2 = Variable Star and Exoplanet Section of the Czech Astronomical Society
(http://var2.astro.cz/EN/brno/eclipsing_binaries.php);
3 = Zessewitsch, V.P. 1954, Odessa Rep., 4, 113;
4 = Lacy, C.H.S. 2002IBVS.5357....1L 2002IBVS.5357....1L;
5 = Lacy, C.H.S. 2003IBVS.5487....1L 2003IBVS.5487....1L;
6 = Hubscher J. 2005IBVS.5643....1H 2005IBVS.5643....1H;
7 = Lacy, C.H.S. 2004IBVS.5577....1L 2004IBVS.5577....1L;
8 = Lacy, C.H.S. 2006IBVS.5670....1L 2006IBVS.5670....1L;
9 = Lacy, C.H.S. 2007IBVS.5764....1L 2007IBVS.5764....1L;
10 = Brat et al. 2007OEJV...74....1B 2007OEJV...74....1B;
11 = Hubscher et al. 2008, Cat. J/other/IBVS/5830;
12 = Diethelm R. 2008IBVS.5837....1D 2008IBVS.5837....1D;
13 = This paper
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 12 F12.4 d HJD Heliocentric Julian Date
14- 19 F6.2 km/s RV1 Radial velocity of primary component (1)
21- 27 F7.2 km/s RV2 Radial velocity of secondary component (1)
29- 32 F4.2 km/s e_RV1 RV1 uncertainty
34- 37 F4.2 km/s e_RV2 RV2 uncertainty
39- 43 F5.2 km/s (O-C)1 Fit residual of primary component
45- 49 F5.2 km/s (O-C)2 Fit residual of secondary component
51- 56 F6.4 --- Phase Phase
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Note (1): Radial velocities for the two components were derived using TODCOR,
a two-dimensional cross-correlation technique (Zucker & Mazeh,
1994ApJ...420..806Z 1994ApJ...420..806Z). See section 2.3 for further details.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Jan-2012