Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 425, Issue 2, Pages 1245-1256Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2012.21510.x
Keywords
binaries: eclipsing; binaries: spectroscopic; binaries: visual; stars: fundamental parameters; stars: individual: ASAS J010538-3821; 1; stars: low-mass
Categories
Funding
- European Social Fund
- Republic of Poland within the framework of the Integrated Regional Operational Programme
- Polish National Science Center [5813/B/H03/2011/40]
- Foundation for Polish Science
- Polish Ministry of Science and Higher Education [N203 005 32/0449, N203 3020 35, N203 379936]
- Proyecto FONDECYT [3120153]
- Centro de Astrofisica FONDAP Proyecto [15010003]
- Comite Mixto ESO-Chile
- Ministry for the Economy, Development, and Tourism's Programa Iniciativa Cientifica Milenio [P07-021-F]
- Townes Fellowship Program
- UC Berkeley SSL grant
- State of Tennessee Centers of Excellence programme
- National Science Foundation [PHY05-51164, 0959447, 0836187, 0707634, 0449001]
- Optical Infrared Coordination Network (OPTICON)
- European Commission
- Direct For Education and Human Resources
- Division Of Human Resource Development [1238809] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009052, 0449001] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0707634, 1211782, 0959447] Funding Source: National Science Foundation
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We present the orbital and physical parameters of a newly discovered low-mass detached eclipsing binary from the All-Sky Automated Survey (ASAS) data base: ASAS J0113283821.1 A, which is a member of a visual binary system with the secondary component separated by about 1.4 arcsec. The radial velocities have been calculated from the high-resolution spectra obtained with the 1.9-m Radcliffe telescope/Grating Instrument for Radiation Analysis with a Fibre-Fed Echelle (GIRAFFE) spectrograph, the 3.9-m Anglo-Australian Telescope (AAT)/University College London Echelle Spectrograph (UCLES) and the 3.0-m Shane telescope/Hamilton Spectrograph (HamSpec) on the basis of the todcor technique and the positions of the Ha emission lines. For the analysis, we have used V- and I-band photometry obtained with the 1.0-m Elizabeth telescope and the 0.41-m Panchromatic Robotic Optical Monitoring and Polarimetry Telescopes (PROMPT), supplemented with the publicly available ASAS light curve of the system. We have found that ASAS J0113283821.1 A is composed of two late-type dwarfs, which have masses of M1 = 0.612 +/- 0.030 M? and M2 = 0.445 +/- 0.019 M? and radii of R1 = 0.596 +/- 0.020 R? and R2 = 0.445 +/- 0.024 R?. Both show a substantial level of activity, which manifests in strong Ha and H beta emission and the presence of cool spots. The influence of the third light on the eclipsing pair properties has also been evaluated and the photometric properties of component B have been derived. A comparison with several popular stellar evolution models shows that the system is on its main-sequence evolution stage and that it is probably more metal-rich than the Sun. We have also found several clues to suggest that component B itself is a binary composed of two nearly identical similar to 0.5-M? stars.
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