Statistics – Methodology
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933005b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #330.05
Statistics
Methodology
Scientific paper
Eclipsing binaries (EBs) provide direct measurements of the absolute masses and radii of the component stars. Recent observations of M-dwarf EBs have indicated that their measured radii are larger than those predicted by stellar models. Tidally induced magnetic fields in close binaries may be responsible for this discrepancy. This scenario may be tested by characterizing the relation between orbital period and the ratio of predicted to observed stellar radii. The small number of fully characterized M-dwarf EBs, however, makes any trend in this relation difficult to quantify.
Here, we describe a search for M-dwarf EBs carried out using multi-band timeseries photometry from SDSS Stripe 82. We describe the construction of our light-curve catalog and the methodology for extracting variable point sources. We discuss the classification of the 650 periodic variables discovered in these data, and the subsequent discovery of nearly 300 EB candidates. For the 90 EBs that had suitable light-curves, we fit binary models using the Wilson-Devinney code (Wilson 1971, 2007), and estimated relative radii, temperatures, luminosities, photometric mass ratios, and orbital inclinations of the binary systems. From this sample, we identified two bright candidates for additional follow-up observations.
We present the results of these observations, which include R and I band light-curves obtained with the Apache Point 3.5-m and Kitt Peak 2.1-m telescopes, as well as radial velocity measurements carried out with the Apache Point 3.5-m telescope. We obtain estimates of the absolute masses and radii of the stars in these systems. Finally, we compare these measurements to predictions generated by stellar models of the lower main sequence, and characterize the influence of tidally-induced magnetic fields on the measured radii of the M-dwarf components of these systems.
Bhatti Waqas
Ford Holland C.
Petro Larry D.
Richmond Michael William
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