J/ApJ/836/177 RVs and R-band obs. of the EB* V541 Cyg (Torres+, 2017)
Absolute dimensions of the eccentric Eclipsing binary V541 Cygni.
Torres G., McGruder C.D., Siverd R.J., Rodriguez J.E., Pepper J.,
Stevens D.J., Stassun K.G., Lund M.B., James D.
<Astrophys. J., 836, 177-177 (2017)>
=2017ApJ...836..177T 2017ApJ...836..177T (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, RI ; Radial velocities
Keywords: binaries: eclipsing; stars: evolution; stars: fundamental parameters;
stars: individual: V541 Cyg; techniques: photometric
Abstract:
We report new spectroscopic and photometric observations of the
main-sequence, detached, eccentric, double-lined eclipsing binary
V541Cyg (P=15.34d, e=0.468). Using these observations together with
existing measurements, we determine the component masses and radii to
better than 1% precision: M1=2.335-0.013+0.017M☉,
M2=2.260-0.013+0.016M☉,
R1=1.859-0.009+0.012R☉, and
R2=1.808-0.013+0.015R☉. The nearly identical B9.5 stars
have estimated effective temperatures of 10650±200K and
10350±200K. A comparison of these properties with current stellar
evolution models shows excellent agreement at an age of about 190Myr
and [Fe/H]~-0.18. Both components are found to be rotating at the
pseudo-synchronous rate. The system displays a slow periastron advance
that is dominated by general relativity (GR), and has previously been
claimed to be slower than predicted by theory. Our new measurement,
dotω=0.859-0.017+0.042deg/century, has an 88% contribution
from GR and agrees with the expected rate within the uncertainties. We
also clarify the use of the gravity darkening coefficients in the
light-curve fitting Eclipsing Binary Orbit Program (EBOP), a version
of which we use here.
Description:
V541 Cyg was observed spectroscopically at the Harvard-Smithsonian
Center for Astrophysics (CfA) with the Digital Speedometer (DS) on the
1.5m Tillinghast reflector at the Fred L. Whipple Observatory on
Mount Hopkins (AZ). We gathered 72 exposures between 2000 July and
2004 October (R∼35000).
Observations of V541 Cyg were obtained between 2007 May and 2014
November in the course of the Kilodegree Extremely Little Telescope
transiting planet program (KELT). The passband of these observations
resembles that of a very broad R-band filter. The magnitudes given in
tables 2 and 3 are instrumental (not referring to a standard
photometric system).
Objects:
----------------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
----------------------------------------------------------------------
19 42 29.45 +31 19 40.2 V541 Cyg = TYC 2656-3703-1 (P=15.33789)
----------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 53 71 Heliocentric radial velocity measurements of
V541 Cyg from CfA
table2.dat 29 3885 KELT observations of V541 Cyg East of the meridian
table3.dat 29 2940 KELT observations of V541 Cyg West of the meridian
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
I/276 : Tycho Double Star Catalogue (TDSC) (Fabricius+ 2002)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/A+AS/131/395 : Eclipsing binaries light curves models (Claret 1998)
J/AJ/124/1144 : Orbits of single-lined spectroscopic binaries (Latham, 2002)
J/AcA/54/207 : Ephemerids of eclipsing binaries (Kreiner, 2004)
J/A+A/424/919 : Stellar models grids. Z=0.02, M=0.8 to 125 (Claret, 2004)
J/A+A/446/785 : Catalogue of eclipsing variables (Malkov+, 2006)
J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)
J/other/IBVS/5941 : Minima and maxima of 292 variables (Hubscher+, 2010)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/MNRAS/401/257 : Early-type binaries on main sequence (Khaliullin+, 2010)
J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)
J/ApJ/742/123 : Photometry and Velocity of LSPM J1112+7626 (Irwin+, 2011)
J/ApJ/761/123 : KELT-1 photometry and spectroscopy follow-up (Siverd+, 2012)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/AN/334/860 : Catalog of eclipsing variables. Version 2 (Avvakumova+, 2013)
J/A+A/557/A119 : Eclipsing binary system LL Aquarii (Southworth, 2013)
J/other/PASA/31.24 : Milky Way detached double-lined EB catalog (Eker+, 2014)
J/ApJ/832/L18 : Gaia's DR1 parallaxes vs previous measurements (Jao+, 2016)
J/ApJ/831/L6 : Eclipsing binary parallaxes with Gaia data (Stassun+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d HJD Heliocentric Julian Date, 2,400,000+
12- 17 F6.2 km/s RV1 [-100/62] Radial velocity, primary (1)
19- 22 F4.2 km/s e_RV1 [1/3] Uncertainty in RV1
24- 28 F5.2 km/s O-C1 [-3.3/3] Orbit fit residual, primary
30- 35 F6.2 km/s RV2 [-96/73] Radial velocity, secondary (1)
37- 40 F4.2 km/s e_RV2 [1/3] Uncertainty in RV2
42- 46 F5.2 km/s O-C2 [-3.5/4.7] Orbit fit residual, secondary
48- 53 F6.4 --- Phase Orbital phase
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Note (1): Radial velocities include corrections for systematics (see text)
as well as small run-to-run adjustments to remove instrumental drifts.
Typical uncertainties are about 1.5km/s.
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 12 F12.6 d HJD Heliocentric Julian Date; HJD-2400000
14- 21 F8.5 mag Rmag [14.5/15.6] Scaled KELT broad R band magnitude (1)
23- 29 F7.5 mag e_Rmag [0.002/0.04] Uncertainty in Rmag
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Note (1): The passband of these observations resembles that of a very broad
R-band filter. Scaled magnitudes are from the raw light curve with a 90-day
median smoothing applied.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Oct-2017