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 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)
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22 00 52.57 -03 42 11.7 TYC 5227-1023-1 = Gaia 2670251536668384128
------------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 42 182 CCD photometry
table2.dat 51 26 Heliocentric radial velocities Tycho 5227-1023-1
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Spec Spectrum number, from Asiago echelle log
7- 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
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 20-Nov-2017