J/MNRAS/421/2616 LMC eccentric ellipsoidal red giant binaries (Nicholls+, 2012)
Eccentric ellipsoidal red giant binaries in the LMC: complete orbital solutions
and comments on interaction at periastron.
Nicholls C.P., Wood P.R.
<Mon. Not. R. Astron. Soc., 421, 2616-2628 (2012)>
=2012MNRAS.421.2616N 2012MNRAS.421.2616N
ADC_Keywords: Magellanic Clouds ; Binaries, orbits ; Stars, giant
Keywords: stars: AGB and post-AGB - binaries: close - stars: oscillations
Abstract:
Modelling ellipsoidal variables with known distances can lead to exact
determination of the masses of both components, even in the absence of
eclipses. We present such modelling using light and radial velocity
curves of ellipsoidal red giant binaries in the Large Magellanic Cloud
(LMC), where they are also known as sequence E stars. Stars were
selected as likely eccentric systems on the basis of light curve shape
alone. We have confirmed their eccentric nature and obtained system
parameters using the Wilson-Devinney code.
Description:
We selected a sample of seven sequence E stars with I-band magnitude
brighter than 16 and light curves indicative of eccentric orbits from
the OGLE II data base. The stars were monitored using the Double Beam
Spectrograph (DBS) at the ANU 2.3-m telescope at SSO from 2006 May to
2008 April, with the aim of obtaining radial velocities.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table13.dat 70 7 Candidate eccentric ellipsoidal variables in the
OGLE II data base (table1) and
initial parameters (table3)
table2.dat 59 33 Radial velocities of eccentric sequence E stars
table4.dat 92 7 Simultaneous light and velocity solutions
for OGLE052013.51-692253.2
table5.dat 92 7 Simultaneous light and velocity solutions
for OGLE052438.40-700028.8
table6.dat 92 6 Simultaneous light and velocity solutions
for OGLE052812.41-693417.9
table7.dat 92 7 Simultaneous light and velocity solutions
for OGLE052850.12-701211.2
table8.dat 92 8 Simultaneous light and velocity solutions
for OGLE053033.55-701742.0
table9.dat 92 8 Simultaneous light and velocity solutions
for OGLE053124.49-701927.4
table10.dat 91 7 Simultaneous light and velocity solutions
for OGLE053159.96-693439.5
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See also:
J/AcA/54/347 : IVB mag of LMC ellipsoidal variables (Soszinski+, 2004)
Byte-by-byte Description of file: table13.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [OGLE]
5- 22 A18 --- OGLE OGLE designation (HHMMSS.ss+DDMMSS.s, J2000)
24- 28 F5.2 mag Vmag OGLE V magnitude
30- 34 F5.2 mag Imag OGLE I magnitude
36- 44 F9.1 d HJD0 Input phase zero-point
46- 51 F6.2 d Per Period
53- 59 F7.2 Lsun Lum Luminosity
61- 67 F7.2 K Teff Effective temperature
69- 70 I2 --- Tab Number of the table with solutions
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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- 10 F10.2 d HJD Heliocentric Julian date
12- 17 F6.2 km/s RV1 ?=- Radial velocity of OGLE052013.51-692253.2
19- 24 F6.2 km/s RV2 ?=- Radial velocity of OGLE052438.40-700028.8
26- 31 F6.2 km/s RV3 ?=- Radial velocity of OGLE052812.41-693417.9
33- 38 F6.2 km/s RV4 ?=- Radial velocity of OGLE052850.12-701211.2
40- 45 F6.2 km/s RV5 ?=- Radial velocity of OGLE053033.55-701742.0
47- 52 F6.2 km/s RV6 ?=- Radial velocity of OGLE053124.49-701927.4
54- 59 F6.2 km/s RV7 ?=- Radial velocity of OGLE053159.96-693439.5
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Byte-by-byte Description of file: table[456789].dat table10.dat
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Bytes Format Units Label Explanations
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1- 2 I2 deg i Inclination angle
3 A1 --- n_i [abc] Final solution type (1)
5- 11 F7.3 Rsun a Semi-major axis
13- 17 F5.3 Rsun e_a rms uncertainty on a
19- 23 F5.3 --- e Eccentricity
25- 29 F5.3 --- e_e rms uncertainty on e
31- 35 F5.3 rad omega Angle of periastron ω
37- 41 F5.3 rad e_omega rms uncertainty on omega
43- 47 F5.3 --- Omega1 Lagrangian potential of the primary Ω1
49- 53 F5.3 --- e_Omega1 rms uncertainty on Omega1
55- 59 F5.3 --- q Mass ratio, M2/M1
61- 65 F5.3 --- e_q rms uncertainty on q
67- 70 F4.2 Msun M1 Mass of the primary
72- 75 F4.2 Msun M2 Mass of the secondary
77- 82 F6.2 Rsun R1 Radius of the primary
84- 92 E9.4 --- Sum Sum of squares of residuals of the I-band
light curve from the modelled curve,
Σ[r(I)]2
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Note (1): Notes as follows:
a = Final solution at the best inclination and with the most accurate
companion properties
c = Solution at the best inclination and with the most accurate
companion properties
b = Final solution including the light contribution from the secondary
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Mar-2013