J/ApJ/921/133 EBs in Ruprecht 147. IV. EPIC 219511354 LCs & RVs (Torres+, 2021)
Eclipsing binaries in the open cluster Ruprecht 147.
IV. The active triple system EPIC 219511354.
Torres G., Vanderburg A., Curtis J.L., Kraus A.L., Gaidos E.
<Astrophys. J., 921, 133 (2021)>
=2021ApJ...921..133T 2021ApJ...921..133T
ADC_Keywords: Binaries, eclipsing; Photometry; Spectra, optical;
Radial velocities
Keywords: Binary stars ; Open star clusters ; Stellar evolutionary models ;
Stellar activity ; Stellar photometry ; Radial velocity ;
Eclipsing binary stars
Abstract:
We report follow-up spectroscopic observations of the 1.62 day,
K-type, detached, active, near-circular, double-lined eclipsing binary
EPIC 219511354 in the open cluster Ruprecht 147, identified previously
on the basis of photometric observations from the Kepler/K2 mission.
This is the fourth eclipsing system analyzed in this cluster. A
combined analysis of the light curve and radial velocities yields
accurate masses of MAa=0.912±0.013M☉ and
MAb=0.822±0.010M☉ for the primary (star Aa) and secondary
(Ab), along with radii of RAa=0.920±0.016R☉ and
RAb=0.851±0.016R☉, and effective temperatures of
5035±150 and 4690±130K, respectively. Comparison with current
models of stellar evolution for the known age and metallicity of the
cluster reveals that both radii are larger (by 10%-14%) and both
temperatures cooler (by ∼6%) than theoretically predicted, as is often
seen in M dwarfs. This is likely caused by the significant stellar
activity in the system, manifested here by 6% peak- to-peak
out-of-eclipse variability, a filled-in Hα line, and its
detection as an X-ray source. We also find EPIC 219511354 to be a
hierarchical triple system, with a low-mass tertiary in an eccentric
220 day orbit.
Description:
EPIC 219511354 was observed by the Kepler spacecraft during Campaign 7
of its extended K2 mission, for a total of 83 days between
2015 October 4 and 2015 December 26. See Section 2.1.
Spectroscopic observations of EPIC 219511354 were carried out at the
Center for Astrophysics (CfA) between 2015 October and 2021 June,
using the Tillinghast Reflector Echelle Spectrograph (TRES). This is a
fiber-fed, bench-mounted instrument that is attached to the 1.5m
Tillinghast reflector at the Fred L. Whipple Observatory on Mount
Hopkins (Arizona, USA). We collected a total of 19 usable spectra at a
resolving power of R∼44000, which cover the wavelength region
3800-9100Å in 51 orders. See Section 2.2.
Objects:
------------------------------------------------------------------------
RA (ICRS) DE Designation(s)
------------------------------------------------------------------------
19 15 35.33 -16 34 11.7 EPIC 219511354 = Gaia DR3 4087847862581712768
------------------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 32 3666 Detrended K2 photometry of EPIC 219511354
table2.dat 48 19 Heliocentric Radial Velocity Measurements of
EPIC 219511354
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/AJ/124/1144 : Orbits of single-lined spectroscopic binaries (Latham, 2002)
J/A+A/450/681 : Companions to close sp. binaries (Tokovinin+, 2006)
J/ApJ/662/602 : Radial velocities of HD 110555 (Torres+, 2007)
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/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)
J/ApJ/742/123 : Photometry and Velocity of LSPM J1112+7626 (Irwin+, 2011)
J/AJ/145/134 : RVels of 108 stars in Ruprecht 147 (Curtis+, 2013)
J/MNRAS/454/2863 : Teff against colours calibrations (Huang+, 2015)
J/AJ/152/8 : Stellar multiplicity on planetary systems I. (Kraus+, 2016)
J/ApJS/222/14 : Planetary cand. from 1st yr K2 mission (Vanderburg+, 2016)
J/A+A/619/A176 : Chemical composition of Ruprecht 147 (Bragaglia+, 2018)
J/AJ/155/173 : K2 light curve for K2-231 (Curtis+, 2018)
J/ApJ/887/109 : EBs in Ruprecht 147. II. EPIC 219568666 (Torres+, 2019)
J/ApJ/904/140 : Ruprecht 147 members & 5 other cl. (Curtis+, 2020)
J/ApJ/896/162 : EBs in Ruprecht 147. III. EPIC 219552514 (Torres+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d BJD [57301.48/57382.81] Barycentric Julian Date;
BJD-2400000
12- 21 F10.8 --- RFluxF [0.58/1.03] Flattened residual flux (1)
23- 32 F10.8 --- RFluxNF [0.59/1.01] Not Flattened residual flux (1)
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Note (1): K2 photometry after removal of instrumental effects and long-term
drifts, and normalized by dividing by a spline fit to the
out-of-eclipse observations (RFluxF). The RFluxNF column contains
the same data without the normalization.
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d BJD [57297.69/59384.9] Barycentric Julian Date;
BJD-2400000
12- 17 F6.2 km/s RVAa [-62.1/151.5] Radial velocity of component Aa
19- 22 F4.2 km/s e_RVAa [1.26/2.15] RVAa uncertainty
24- 29 F6.2 km/s RVAb [-72.2/157.4] Radial velocity of component Ab
31- 34 F4.2 km/s e_RVAb [2.03/3.5] RVAb uncertainty
36- 41 F6.4 --- Inner [0.11/0.95] Inner phase
43- 48 F6.4 --- Outer [0.12/1] Outer phase
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History:
From electronic version of the journal
References:
Torres et al. Paper I. 2018ApJ...866...67T 2018ApJ...866...67T
Torres et al. Paper II. 2019ApJ...887..109T 2019ApJ...887..109T Cat. J/ApJ/887/109
Torres et al. Paper III. 2020ApJ...896..162T 2020ApJ...896..162T Cat. J/ApJ/896/126
Torres et al. Paper IV. 2021ApJ...921..133T 2021ApJ...921..133T This catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 23-Feb-2023