The smallest mass ratio young star spectroscopic binaries

L. Prato*, M. Simon, T. Mazeh, I. S. McLean, D. Norman, S. Zucker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)863-871
Number of pages9
JournalAstrophysical Journal
Issue number2 I
StatePublished - 20 Apr 2002


  • Binaries: spectroscopic
  • Stars: fundamental parameters
  • Stars: pre-main-sequence


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