TY - JOUR
T1 - The smallest mass ratio young star spectroscopic binaries
AU - Prato, L.
AU - Simon, M.
AU - Mazeh, T.
AU - McLean, I. S.
AU - Norman, D.
AU - Zucker, S.
PY - 2002/4/20
Y1 - 2002/4/20
N2 - 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⊙, 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.
AB - 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⊙, 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.
KW - Binaries: spectroscopic
KW - Stars: fundamental parameters
KW - Stars: pre-main-sequence
UR - http://www.scopus.com/inward/record.url?scp=0038433461&partnerID=8YFLogxK
U2 - 10.1086/339397
DO - 10.1086/339397
M3 - מאמר
AN - SCOPUS:0038433461
VL - 569
SP - 863
EP - 871
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2 I
ER -