J/ApJ/860/1 Radial velocity measurements of 20 EBs in LMC (Graczyk+, 2018)
The late-type eclipsing binaries in the Large Magellanic Cloud: catalog of
fundamental physical parameters.
Graczyk D., Pietrzynski G., Thompson I.B., Gieren W., Pilecki B.,
Konorski P., Villanova S., Gorski M., Suchomska K., Karczmarek P.,
Stepien K., Storm J., Taormina M., Kolaczkowski Z., Wielgorski P.,
Narloch W., Zgirski B., Gallenne A., Ostrowski J., Smolec R., Udalski A.,
Soszynski I., Kervella P., Nardetto N., Szymanski M.K., Wyrzykowski L.,
Ulaczyk K., Poleski R., Pietrukowicz P., Kozlowski S., Skowron J., Mroz P.
<Astrophys. J., 860, 1 (2018)>
=2018ApJ...860....1G 2018ApJ...860....1G
ADC_Keywords: Binaries, eclipsing; Magellanic Clouds; Radial velocities;
Abundances, [Fe/H]; Photometry, VRI
Keywords: binaries: eclipsing ; Magellanic Clouds ; stars: evolution ;
stars: fundamental parameters ; stars: late-type
Abstract:
We present a determination of the precise fundamental physical
parameters of 20 detached, double-lined, eclipsing binary stars in the
Large Magellanic Cloud (LMC) containing G- or early K-type giant
stars. Eleven are new systems; the remaining nine are systems already
analyzed by our team for which we present updated parameters. The
catalog results from our long-term survey of eclipsing binaries in the
Magellanic Clouds suitable for high-precision determination of
distances (the Araucaria Project). The V-band brightnesses of the
systems range from 15.4 to 17.7mag, and their orbital periods range
from 49 to 773days. Six systems have favorable geometry showing total
eclipses. The absolute dimensions of all eclipsing binary components
are calculated with a precision of better than 3%, and all systems are
suitable for a precise distance determination. The measured stellar
masses are in the range 1.4 to 4.6M☉, and comparison with the
MESA isochrones gives ages between 0.1 and 2.1Gyr. The systems show an
age-metallicity relation with no evolution of metallicity for systems
older than 0.6Gyr, followed by a rise to a metallicity maximum at age
0.5Gyr and then a slow metallicity decrease until 0.1Gyr. Two systems
have components with very different masses: OGLE LMC-ECL-05430 and
OGLE LMC-ECL-18365. Neither system can be fitted by a single stellar
evolution isochrone, explained by a past mass transfer scenario in the
case of ECL-18365 and a gravitational capture or hierarchical binary
merger scenario in the case of ECL-05430. The longest-period system,
OGLE LMC SC9_230659, shows a surprising apsidal motion that shifts the
apparent position of the eclipses. This is a clear sign of a physical
companion to the system; however, neither investigation of the spectra
nor light-curve analysis indicates a third-light contribution larger
than 2%-3%. In one spectrum of OGLE LMC-ECL-12669, we noted a peculiar
dimming of one of the components by 65% well outside of the eclipses.
We interpret this observation as arising from an extremely rare
occultation event, as a foreground Galactic object covers only one
component of an extragalactic eclipsing binary.
Description:
We used optical V- and I-band photometry in the Johnson-Cousins
filters obtained with the Warsaw 1.3m telescope at Las Campanas
Observatory in the course of the second, third, and fourth phases of
the OGLE project (Udalski+ 1997AcA....47..319U 1997AcA....47..319U ;
Udalski 2003AcA....53..291U 2003AcA....53..291U ; Udalski+ 2015AcA....65....1U 2015AcA....65....1U) and
published in catalogs of eclipsing binary stars in the LMC (Graczyk+
2011, J/AcA/61/103 and Pawlak+ 2016, J/AcA/66/405).
Near-infrared J-, H-, and K-band photometry was collected with the ESO
NTT telescope on La Silla, equipped with the SOFI camera. The
photometry was later converted onto the 2MASS system using the
transformation equations given by Carpenter (2001AJ....121.2851C 2001AJ....121.2851C).
High-resolution echelle spectra were collected with the MIKE
spectrograph (R∼40000) on the Magellan Clay 6.5m telescope at Las
Campanas, the HARPS spectrograph (R∼80000) on the 3.6m telescope at
La Silla, and the UVES spectrograph (R∼80000) on the 8.4m VLT Unit 2
telescope at Paranal.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 20 The target stars
table2.dat 64 318 The radial velocity measurements
table3.dat 48 20 The spectroscopic light ratios at 5500Å
table4.dat 64 40 Atmospheric parameters
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See also:
VI/120 : High-resolution synthetic stellar library (Coelho+, 2005)
J/AJ/106/2096 : Limb-darkening coefficients in binaries (Van Hamme 1993)
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/A+A/339/858 : Calibration of stellar parameters (Di Benedetto 1998)
J/AJ/119/1448 : Improved properties for cool stars (Houdashelt+, 2000)
J/AcA/50/421 : OGLE-II DIA BUL_SC1 field (Wozniak, 2000)
J/AcA/53/1 : OGLE eclipsing binaries in LMC (Wyrzykowski+, 2003)
J/AJ/131/2514 : Radial velocities of red giants in the SMC (Harris+, 2006)
J/MNRAS/371/879 : Effective temperatures of 215 FGK giants (Kovtyukh+, 2006)
J/A+A/450/735 : Effective temperatures and radii of stars (Masana+, 2006)
J/AJ/134/1963 : MACHO r,b LCs of MC eclipsing binaries (Faccioli+, 2007)
J/A+A/475/1003 : Stellar parameters of G and K giant stars (Hekker+, 2007)
J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008)
J/AJ/135/209 : Rotational and radial vel. 761 HIP giants (Massarotti+, 2008)
J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+, 2009)
J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)
J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)
J/AcA/61/103 : VI light curves of LMC eclipsing binaries (Graczyk+, 2011)
J/ApJS/193/1 : UBVRIJHK color-temperature calibration (Worthey+, 2011)
J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)
J/MNRAS/436/953 : OGLE-LMC-CEP-0227 RV and VI[3.6] curves (Pilecki+, 2013)
J/A+A/557/A119 : Eclipsing binary system LL Aquarii (Southworth, 2013)
J/ApJ/780/59 : The Araucaria project: EBs in SMC (Graczyk+, 2014)
J/ApJ/832/121 : 4-yr RV survey of red giant in EBs (Gaulme+, 2016)
J/AcA/66/405 : Gal. bulge eclipsing & ellipsoidal bin. (Soszynski+, 2016)
J/AJ/153/261 : Red giant stellar parameters in the LMC bar (Song+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- OGLE OGLE identifier
from Graczyk+ 2011, J/AcA/61/103
16- 18 A3 --- f_OGLE Flag(s) on OGLE (1)
20- 21 I2 h RAh Hour of right ascension (J2000)
23- 24 I2 min RAm Minute of right ascension (J2000)
26- 30 F5.2 s RAs Second of right ascension (J2000)
32 A1 --- DE- Sign of declination (J2000)
33- 34 I2 deg DEd Degree of declination (J2000)
36- 37 I2 arcmin DEm Arcminute of declination (J2000)
39- 42 F4.1 arcsec DEs Arcsecond of declination (J2000)
44- 49 F6.3 mag Vmag [15.8/17.7] Observed Johnson V-band magnitude
51- 55 F5.3 mag V-I [1/1.4] V-I color index
57- 61 F5.3 mag V-K [2.2/3.3] V-K color index
63- 67 F5.3 mag J-K [0.5/0.9] J-K color index;
in 2MASS photometric system
69- 74 F6.2 d Pobs [49.4/772.6] Orbital period
76- 81 F6.1 d T0 [1141.1/5570.7] Epoch of primary minimum;
HJD-2450000
83- 85 A3 --- New New?
87- 90 A4 --- Ref Reference(s) (2)
92- 96 A5 --- ClMm Cluster member
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Note (1): Flag as follows:
a = The OGLE-III temporary name OGLE-051019.64-685812.3 was used by
Pietrzynski+ (2009ApJ...697..862P 2009ApJ...697..862P).
b = The OGLE-II internal ID is given; OGLE-III and IV internal IDs are
LMC111.2 62181 and LMC503.24 153, respectively.
c = The name LMC-ECL-26122 was used by Pietrzynski+ (2013Natur.495...76P 2013Natur.495...76P);
however, this name was assigned to another star in the latest release of
the OGLE catalog of eclipsing binary stars (Pawlak+ 2016, J/AcA/66/405).
Note (2): Reference code as follows:
1 = Pietrzynski+ (2013Natur.495...76P 2013Natur.495...76P),
2 = Elgueta+ (2016AJ....152...29E 2016AJ....152...29E),
3 = this paper.
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- --- [OGLE-]
6- 19 A14 --- OGLE OGLE identifier
21- 30 F10.5 d HJD [3989.9/7658.9] Heliocentric Julian
Date; HJD-2450000
32- 37 F6.2 km/s RV1 [208/335] Radial velocity, first component
39- 42 F4.2 km/s e_RV1 [0.2/0.9] Uncertainty in RV1
44- 49 F6.2 km/s RV2 [205.3/343.8] Radial velocity, second component
51- 54 F4.2 km/s e_RV2 [0.1/1] Uncertainty in RV2
56- 64 A9 --- Inst Instrument
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- OGLE OGLE identifier
16- 20 F5.3 --- I2/I1 [0.1/4.4] Line intensity I2/I1 (3)
22- 26 F5.3 --- e_I2/I1 [0.01/0.4] I2/I1 uncertainty
28- 31 F4.2 --- k21 [0.6/1.2] Correction k21
33- 36 F4.2 --- e_k21 [0.02/0.03] k21 uncertainty (see Section 3.2)
38- 42 F5.3 --- L2/L1 [0.2/3.5] Light ratio L2/L1
44- 48 F5.3 --- e_L2/L1 [0.01/0.3] L2/L1 uncertainty
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Note (3): The line intensity is the relative strengths of the absorption lines
of the secondary with respect to those of the primary.
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- OGLE OGLE identifier
16 A1 --- n_OGLE p=primary; s=secondary
18- 21 I4 K Teff Spectroscopic effective temperature
(section 3.3)
22 A1 --- f_Teff a=fixed value
24- 27 F4.2 [cm/s2] logg Log of surface gravity
28 A1 --- f_logg a=fixed value
30- 34 F5.2 [-] [Fe/H] [-1/0.2] Metallicity
36- 38 F3.1 km/s Vt Microturbulent velocity
39 A1 --- f_Vt a=fixed value
41- 43 F3.1 km/s Vmt [3.6/5.5] Macroturbulent velocity
45- 48 I4 K Tseff [4360/5500] Effective temperature
from Kovtyukh+ (2006) calibration
(Section 3.5)
50- 53 I4 K Tceff [4305/5480] Color temperature (Section 3.5)
55- 58 I4 K Tbeff [4310/5535] Temperature derived from the
bolometric flux scaling (Section 4)
60- 64 F5.2 [-] [Fe/H]C [-0.8/0.03] Corrected metallicity used
throughout the paper
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Jun-2019