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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 (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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
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.
Byte-by-byte Description of file: table[23].dat
Bytes Format Units Label Explanations
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
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.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Oct-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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