A PRECISE PHYSICAL ORBIT FOR THE M-DWARF BINARY GLIESE 268
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Barry-2012-A precise physical o.pdf
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Author(s)
Barry, Richard K.
Forveille, Thierry
Danchi, W. C.
Di Folco, E.
Queloz, D.
Spooner, H. R.
Torres, G.
Traub, W. A.
Delfosse, Xavier
Mayor, Michel
Date Issued
November 2012
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Barry, R. K., B.-O. Demory, D. Ségransan, T. Forveille, W. C. Danchi, E. Di Folco, D. Queloz, et al. “A PRECISE PHYSICAL ORBIT FOR THE M-DWARF BINARY GLIESE 268.” The Astrophysical Journal 760, no. 1 (November 2, 2012): 55. © 2012 The American Astronomical Society
Version
Final published version
Abstract
We report high-precision interferometric and radial velocity (RV) observations of the M-dwarf binary Gl 268. Combining measurements conducted using the IOTA interferometer and the ELODIE and Harvard Center for Astrophysics RV instruments leads to a mass of 0.22596 ± 0.00084 M [subscript ☉] for component A and 0.19230 ± 0.00071 M [subscript ☉] for component B. The system parallax as determined by these observations is 0.1560 ± 0.0030 arcsec—a measurement with 1.9% uncertainty in excellent agreement with Hipparcos (0.1572 ± 0.0033). The absolute H-band magnitudes of the component stars are not well constrained by these measurements; however, we can place an approximate upper limit of 7.95 and 8.1 for Gl 268A and B, respectively. We test these physical parameters against the predictions of theoretical models that combine stellar evolution with high fidelity, non-gray atmospheric models. Measured and predicted values are compatible within 2σ. These results are among the most precise masses measured for visual binaries and compete with the best adaptive optics and eclipsing binary results.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
https://doi.org/10.1088/0004-637x/760/1/55
