J/ApJ/876/41 Differential V-band phot. & RVs of V506 Oph (Torres+, 2019)
Absolute dimensions of the early F-type eclipsing binary V506 Ophiuchi.
Torres G., Sandberg Lacy C.H., Fekel F.C., Muterspaugh M.W.
<Astrophys. J., 876, 41 (2019)>
=2019ApJ...876...41T 2019ApJ...876...41T
ADC_Keywords: Binaries, eclipsing; Radial velocities; Spectra, optical;
Photometry
Keywords: binaries: eclipsing; stars: evolution; stars: fundamental parameters;
stars: individual (V506 oph); techniques: photometric;
techniques: spectroscopic
Abstract:
We report extensive differential V-band photometry and high-resolution
spectroscopic observations of the early F-type, 1.06-day detached
eclipsing binary V506 Oph. The observations, along with times of
minimum light from the literature, are used to derive a very precise
ephemeris and the physical properties for the components, with the
absolute masses and radii being determined to 0.7% or better. The
masses are 1.4153±0.0100M☉ and 1.4023±0.0094M☉ for the
primary and secondary, the radii are 1.725±0.010R☉ and
1.692±0.012R☉, and the effective temperatures are 6840±150K
and 6780±110K, respectively. The orbit is circular and the stars are
rotating synchronously. The accuracy of the radii and temperatures is
supported by the resulting distance estimate of 564±30pc, which is
in excellent agreement with the value implied by the trigonometric
parallax listed in the Gaia/Data Release 2 catalog. Current stellar
evolution models from the Modules for Experiments in Stellar
Astrophysics (MESA) Isochrones and Stellar Tracks series for a
composition of [Fe/H]=-0.04 match the properties of both stars in
V506 Oph very well at an age of 1.83Gyr and indicate they are halfway
through their core hydrogen-burning phase.
Description:
V506 Oph was observed spectroscopically with two different instruments.
Between 2010 May and 2017 February, we monitored the binary with the
Center for Astrophysics Harvard & Smithsonian (CfA) Tillinghast
Reflector Echelle Spectrograph (R∼44000 covering the wavelength range
3900-9100Å) attached to the 1.5m Tillinghast reflector at the Fred
L. Whipple Observatory on Mount Hopkins, Arizona; see Table 1.
V506 Oph was also observed at the Fairborn Observatory in southeast
Arizona near Washington Camp, between 2012 February and 2018 May. For
this, we used the Tennessee State University 2m Astronomical
Spectroscopic Telescope (AST) and a fiber-fed echelle spectrograph
(wavelength range of 3800-8260Å and R=15000 at 6000Å); see Table 2.
Times of minimum light for V506 Oph have been recorded since 1928 by
photographic, visual, and photoelectric/CCD techniques. We collect all
176 measurements that we are aware of (84 for the primary and 92 for
the secondary) in Table 3.
Differential photometry of V506 Oph in the V band was performed with
the URSA WebScope at the University of Arkansas at Fayetteville and
with the NFO WebScope near Silver City, New Mexico. V506 Oph (var) was
measured along with two nearby comparison stars (comp; TYC 993-762-1,
V=11.30, B-V=2.08, and TYC 993-0780-1, V=10.78, B-V=0.49). We obtained
8345 URSA images between 2003 July and 2012 June on a total of 129
nights and 7475 NFO images between 2005 January and 2013 June on a
total of 234 nights; see Tables 5 and 6.
Objects:
-----------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
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17 41 04.19 +07 47 04.3 V506 Oph = TYC 993-1631-1 (P=1.0604274)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 43 48 Heliocentric radial velocity measurements
of V506 Oph from CfA
table2.dat 33 17 Heliocentric radial velocity measurements
of V506 Oph from the Fairborn observatory
table3.dat 45 176 Times of minimum light for V506 Oph
table5.dat 17 8345 URSA observations of V506 Oph
table6.dat 17 7475 NFO observations of V506 Oph
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See also:
II/271 : TASS Mark IV patches photometric catalog, version 2 (Droege+, 2007)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/AJ/124/1144 : Orbits of 171 single-lined spectrosc. binaries (Latham, 2002)
J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/AJ/145/111 : Radial velocities of 5 spectroscopic binaries (Fekel+, 2013)
J/AJ/147/148 : Spectroscopy and photometry of AP And (Lacy+, 2014)
J/A+A/615/A49 : TGAS stars membership in open clusters (Cantat-Gaudin+, 2018)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1-10 F10.4 d HJD [55338.8/57807.1] Heliocentric Julian Date;
HJD-2400000
12-18 F7.2 km/s RV1 [-155/144] Radial velocity
20-23 F4.2 km/s e_RV1 [1.8/4.8] Error on radial velocity
25-31 F7.2 km/s RV2 [-149/149] Radial velocity
33-36 F4.2 km/s e_RV2 [1.9/5.1] Error on radial velocity
38-43 F6.4 --- Phase [0.0139/0.984] Orbital phase (G1)
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1-10 F10.4 d HJD [55976.9/58245.9] Heliocentric Julian Date;
HJD-2400000
12-18 F7.2 km/s RV1 [-150/146] Radial velocity for the primary (1)
20-26 F7.2 km/s RV2 [-149.7/145.2] Radial velocity for the
secondary (1)
28-33 F6.4 --- Phase [0.118/0.838] Orbital phase (G1)
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Note (1): Velocity uncertainties are estimated to be 3.2 and 2.6km/s for
the primary and secondary, respectively.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.5 d HJD [25502.3/57237.8] Heliocentric Julian Date;
HJD-2400000
13- 19 F7.5 d e_HJD [7e-5/0.006]? 1σ uncertainty in HJD (1)
21 I1 --- Ecl [1/2] Eclipse type (1=primary; 2=secondary)
23- 24 A2 --- Obs Observation type (2)
26- 34 F9.4 yr Year [1928.699/2015.586] Observation year
36- 43 F8.5 mag O-C [-0.063/0.031] The (O-C) value
45 I1 --- Ref [1/4] Source code (3)
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Note (1): Taken directly from the original publications. Scale factors for
these errors determined from our joint solution with the spectroscopy
are given in the text.
Note (2): Code as follows:
pg = photographic (12 occurrences);
v = visual (47 occurrences);
pe = photoelectric/CCD (117 occurrences).
Note (3): Reference as follows:
1 = http://www.bav-astro.eu/index.php/
veroeffentlichungen/service-for-scientists/lkdb-engl
2 = http://var2.astro.cz/ocgate/?lang=en
3 = Lapham & Snyder (2007SASS...26..141L 2007SASS...26..141L), with the unrealistically
small formal uncertainties multiplied by 30;
4 = Lacy (2007IBVS.5764....1L 2007IBVS.5764....1L).
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Byte-by-byte Description of file: table[56].dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 d HJD Heliocentric Julian Date; HJD-2400000
13- 17 F5.3 mag DelVmag [0.7/1.7] Differential V band magnitude
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Global notes:
Note (G1): Phases are calculated from the reference time of primary eclipse
in Table 4 (where Period = 1.060427381±0.000000024 days).
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Oct-2020