Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-19
Astrophys.J. 569 (2002) 863-871; Erratum-ibid. 598 (2003) 1409
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the April, 2002, ApJ; 6 figures
Scientific paper
10.1086/339397
Using high resolution near-infrared spectroscopy with the Keck telescope, we have detected the radial velocity signatures of the cool secondary components in four optically identified pre-main-sequence, single-lined spectroscopic binaries. All are weak-lined T Tauri stars with well-defined center of mass velocities. The mass ratio for one young binary, NTTS 160905-1859, is M2/M1 = 0.18+/-0.01, the smallest yet measured dynamically for a pre-main-sequence spectroscopic binary. These new results demonstrate the power of infrared spectroscopy for the dynamical identification of cool secondaries. Visible light spectroscopy, to date, has not revealed any pre-main-sequence secondary stars with masses <0.5 M_sun, while two of the young systems reported here are in that range. We compare our targets with a compilation of the published young double-lined spectroscopic binaries and discuss our unique contribution to this sample.
Mazeh Tsevi
McLean Ian S.
Norman Daniel
Prato Lisa
Simon Manfred
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