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A Precise Physical Orbit For The M-Dwarf Binary Gliese 268We 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 plus-minus 0.00084 Mass compared to the sun for component A and 0.19230 plus-minus 0.00071 Mass compared to the sun for component B. The system parallax as determined by these observations is 0.1560 plus-minus 0.0030 arcsec - a measurement with 1.9% uncertainty in excellent agreement with Hipparcos (0.1572 plus-minus 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 2sigma. These results are among the most precise masses measured for visual binaries and compete with the best adaptive optics and eclipsing binary results.
Document ID
20130013663
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1088/0004-637X/760/1/55
Authors
Barry, R. K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Demory, B. -O. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Segransan, D. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Forveille, T. (Geneva Observatory Sauverny, Switzerland)
Danchi, W. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Di Folco, E. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Queloz, D. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Spooner, H. R. (Maryland Univ. College Park, MD, United States)
Torres, G. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Traub, W. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Delfosse, X. (Geneva Observatory Sauverny, Switzerland)
Mayor, M. (Geneva Observatory Sauverny, Switzerland)
Perrier, C. (Geneva Observatory Sauverny, Switzerland)
Udry, S. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
August 27, 2013
Publication Date
November 2, 2012
Publication Information
Publication: The Astrophysical Journal
Volume: 760
Issue: 1
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN7221
Report Number: GSFC-E-DAA-TN7221
Distribution Limits
Public
Copyright
Public Use Permitted.

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