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19 April 2024 |
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The Smallest Mass Ratio Young Star Spectroscopic Binaries | | L. Prato
; M. Simon
; T. Mazeh
; I. S. McLean
; D. Norman
; S. Zucker
; | | Date: |
19 Dec 2001 | | Journal: | Astrophys.J. 569 (2002) 863-871; Erratum-ibid. 598 (2003) 1409 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0201324 | | Services: | Forum | Review | PDF | Favorites | |
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