2013A&A...557A.119S


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST01:02:00

2013A&A...557A.119S - Astronomy and Astrophysics, volume 557A, 119-119 (2013/9-1)

The solar-type eclipsing binary system LL Aquarii.

SOUTHWORTH J.

Abstract (from CDS):

The eclipsing binary LL Aqr consists of two late-type stars in an eccentric orbit with a period of 20.17d. We use an extensive light curve from the SuperWASP survey augmented by published radial velocities and UBV light curves to measure the physical properties of the system. The primary star has a mass of 1.167±0.009M and a radius of 1.305±0.007R. The secondary star is an analogue of the Sun, with a mass and radius of 1.014±0.006M and 0.990±0.008R respectively. The system shows no signs of stellar activity: the upper limit on spot-induced rotational modulation is 3mmag, it is slowly rotating, has not been detected at X-ray wavelengths, and the calcium H and K lines exhibit no emission. Theoretical stellar models provide a good match to its properties for a sub-solar metal abundance of Z=0.008 and an age of 2.5Gyr. Most low-mass eclipsing binary systems are found to have radii larger than expected from theoretical predictions, blamed on tidally-enhanced magnetic fields in these short-period systems. The properties of LL Aqr support this scenario: it exhibits negligible tidal effects, shows no signs of magnetic activity, and matches theoretical models well.

Abstract Copyright:

Journal keyword(s): stars: fundamental parameters - binaries: eclipsing - binaries: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/557/A119): wasplc.dat spectrum.dat>

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 FBS 1109+767 EB* 11 12 42.3412918233 +76 26 56.388992336   16.1   14.8   M4V 47 0
2 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2090 0
3 TYC 3130-2385-1 Al* 18 48 38.0889273281 +44 29 09.853475372   12.18 11.33     ~ 39 0
4 KOI-6667 Al* 19 37 06.9701122978 +41 26 12.800099012           G5V 26 0
5 V* LL Aqr Al* 22 34 42.1526542430 -03 35 58.174865610   9.86 9.32     G1V 28 0

    Equat.    Gal    SGal    Ecl

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2019.10.17-01:02:00

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