2012MNRAS.421.2616N

Query : 2012MNRAS.421.2616N

2012MNRAS.421.2616N - Mon. Not. R. Astron. Soc., 421, 2616-2628 (2012/April-2)

Eccentric ellipsoidal red giant binaries in the LMC: complete orbital solutions and comments on interaction at periastron.

NICHOLLS C.P. and WOOD P.R.

Abstract (from CDS):

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.

Most stars in our sample exhibit unequal light maxima as well as minima, a phenomenon not observed in sequence E variables with circular orbits. We find evidence that the shape of the red giant changes throughout the orbit due to the high eccentricity and the varying influence of the companion.

Brief intervals of pulsation are apparent in two of the red giants. We determine pulsation modes and comment on their placement in the period–luminosity plane.

Defining the parameters of these systems paves the way for modelling to determine by what mechanism eccentricity is maintained in evolved binaries.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: AGB and post-AGB - binaries: close - stars: oscillations

VizieR on-line data: <Available at CDS (J/MNRAS/421/2616): table13.dat table2.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat table10.dat>

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * alf Cet LP? 03 02 16.77307 +04 05 23.0596 6.10 4.17 2.53 1.18 0.02 M1.5IIIa 480 1
2 OGLE LMC-LPV-42608 LP* 05 20 13.3994106082 -69 22 53.182037556   18.073 16.619   15.171 ~ 6 0
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 OGLE J052438.40-700028.8 El* 05 24 38.2758886032 -70 00 28.853111268   16.277 15.092   13.665 ~ 6 0
5 OGLE LMC-SC3 201547 LP* 05 28 12.28 -69 34 18.0   18.810 17.323   15.778 ~ 4 0
6 OGLE LMC-LPV-60622 LP* 05 28 49.9776496584 -70 12 11.185735176   17.312 15.695   13.795 ~ 7 0
7 OGLE LMC-HB-0296 El* 05 30 33.4275214848 -70 17 41.952342984   16.622 15.333   13.883 ~ 4 0
8 OGLE J053124.49-701927.4 El* 05 31 24.38 -70 19 27.3   18.375 16.672   14.963 ~ 3 0
9 OGLE J053159.96-693439.5 LP* 05 31 59.81 -69 34 39.7   17.612 15.992   14.294 ~ 4 0

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