A PRECISE PHYSICAL ORBIT FOR THE M-DWARF BINARY GLIESE 268

作者：Barry R K^*; Demory B O; Segransan D; Forveille T; Danchi W C; Di Folco E; Queloz D; Spooner H R; Torres G; Traub W A; Delfosse X; Mayor M; Perrier C; Udry S

来源：Astrophysical Journal, 2012, 760(1): 55.

DOI：10.1088/0004-637X/760/1/55

• stars: general
• stars: individual (Gliese 268)
• techniques: interferometric
• techniques: radial velocities

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-circle dot for component A and 0.19230 +/- 0.00071 M-circle dot 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 2 sigma. These results are among the most precise masses measured for visual binaries and compete with the best adaptive optics and eclipsing binary results.

• 出版日期2012-11-20