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J/ApJ/839/52   Vi' LCs and RVs of the EB star TYC 5227-1023-1   (Traven+, 2017)

Accurate orbital solution for the new and metal-poor eclipsing binary Tycho 5227-1023-1. Traven G., Munari U., Dallaporta S., Zwitter T. <Astrophys. J., 839, 52-52 (2017)> =2017ApJ...839...52T (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, RI ; Radial velocities Keywords: binaries: eclipsing; binaries: spectroscopic; Galaxy: disk; stars: fundamental parameters; stars: individual: (Tycho 5227-1023-1) Abstract: The orbit and physical parameters of the previously unsolved double-lined eclipsing binary Tyc 5227-1023-1, discovered during the search for RR Lyr variable candidate members of the Aquarius stream, are derived using high-resolution echelle spectroscopy and V,i' photometry. A synthetic spectral analysis of both components has been performed, yielding metallicity [M/H]=-0.63±0.11 for both stars and a temperature for the secondary that is in close agreement with the one from the orbital solution, while the temperature of the primary is determined from photometry (T1=6350K). The masses and radii (M1=0.96±0.02, M2=0.84±0.01M, R1=1.39±0.01, R2=0.98±0.01R) reveal that both stars have already slightly evolved away from the main-sequence band, having an age of about 7Gyr, and the results of the synthetic spectral analysis support the claim of corotation with the orbital motion. The radial velocity of the system is -60±2km/s, while its distance, computed from orbital parameters and the derived reddening EB-V=0.053, is 496±35pc. Even though Tyc 5227-1023-1 was initially treated as a possible member of the Aquarius stream, the results presented here disagree with reported values for this ancient structure and suggest a likely membership of the thick disk. Description: CCD photometry in the Landolt V and SLOAN i' bands of TYC5227-1023-1 has been obtained with ANS Collaboration telescope N.36 located in Cembra (Trento, Italy). Spectra of TYC 5227-1023-1 were secured in 2015-2016 with the Echelle+CCD spectrograph mounted on the 1.82m telescope operated by Osservatorio Astronomico di Padova atop Mt. Ekar (Asiago). Here we recall that the 3600-7400Å wavelength region is covered in 30 orders at a resolving power of 20000. Objects: ------------------------------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------------------------------ 22 00 52.57 -03 42 11.7 TYC 5227-1023-1 = Gaia 2670251536668384128 ------------------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 42 182 CCD photometry table2.dat 51 26 Heliocentric radial velocities Tycho 5227-1023-1
See also: I/259 : The Tycho-2 Catalogue (Hog+ 2000) I/337 : Gaia DR1 (Gaia Collaboration, 2016) J/ApJ/521/682 : Binaries in the Praesepe and Coma clusters (Abt+, 1999) J/A+A/442/1127 : Library of 2500-10500Å synthetic sp. (Munari+, 2005) J/AJ/137/4186 : UBVRI standards around celestial equator (Landolt, 2009) J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010) J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010) J/A+A/525/A2 : Eclipsing binaries in NGC6791 (Brogaard+, 2011) J/A+A/543/A106 : UBVRI photometry in NGC6791 (Brogaard+, 2012) J/other/NewA/27.1 : RR Lyrae candidates in Aqr halo stream (Munari+, 2014) J/AJ/148/81 : APASS BVgri photometry of RAVE stars. I. (Munari+, 2014) J/other/JAD/20.4 : 180 APASS variable stars in Aquarius (Munari+, 2014) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 F8.3 d HJD Observation Heliocentric Julian Date, HJD-2456000 10- 16 F7.4 --- Phase Orbital Phase 18- 23 F6.3 mag Vmag [11.9/12.5] Landolt's V magnitude 25- 29 F5.3 mag e_Vmag [0.002/0.03] Uncertainty in Vmag 31- 36 F6.3 mag imag [11.6/12.2] SDSS i' magnitude 38- 42 F5.3 mag e_imag [0.004/0.02] Uncertainty in imag
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Spec Spectrum number, from Asiago echelle log 7 I1 --- Rej [0/1] 1=Rejected from orbital solution 9- 15 F7.3 d HJD Observation Heliocentric Julian Date, HJD-2457000 17- 22 F6.4 --- Phase Orbital Phase 24- 27 I4 s Exp [1200/3600] Spectrum exposure time 29- 33 F5.1 km/s HRV1 [-73/75]? Heliocentric radial velocity, Star 1 35- 37 F3.1 km/s e_HRV1 [1/5]? Uncertainty in HRV1 39- 43 F5.1 km/s HRV2 [-81/86]? Heliocentric radial velocity, Star 2 45- 48 F4.1 km/s e_HRV2 [1/12]? Uncertainty in HRV2 50- 51 I2 --- S/N [16/32] Spectrum signal-to-noise
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Nov-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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