Abstract
I discuss results from the recent spectroscopic survey for solar-type pre-MS stars in the Lower Centaurus-Crux (LCC) and Upper Centaurus-Lupus (UCL) OB subgroups by Mamajek, Meyer, & Liebert (2002, AJ, 124, 1670). LCC and UCL are subgroups of the Sco-Cen OB association, and the two nearest OB subgroups to the Sun. In the entire survey of 110 pre-main sequence stars, there exists only one Classical T Tauri star (PDS 66), implying that only ∼1% of ∼1 M⊙ stars are still accreting at age 13±7 (1σ) Myr. Accounting for observational errors, the HRD placement of the pre-MS stars is consistent with the bulk of star-formation taking place within 5–10 Myr. In this contribution, I estimate conservative upper limits to the intrinsic velocity dispersions of the post-T Tauri stars in the LCC and UCL subgroups (<1.6 km s−1 and <2.2 km s−1, respectively; 95% CL) using Monte Carlo simulations of Tycho-2 proper motions for candidate subgroup members. I also demonstrate that a new OB subgroup recently proposed to exist in Chamaeleon probably does not.
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References
Alcalá, J.M., et al., 1995, A&A, 114, 109
Barbier-Brossat, M. & Figon, P., 2000, A&AS, 142, 217
D’Antona, F. & Mazzitelli, I. 1997, Mem. Soc. Astr. It., 68, 807
de Bruijne, J., 1999a, MNRAS, 310, 585
de Bruijne, J., 1999b, MNRAS, 306, 381
Hoogerwerf, R., 2000, MNRAS, 313, 43
Jensen, E. L. N. 2001, ASP Conf. Ser. 244: Young Stars Near Earth: Progress and Prospects, 3
Lutz, T. E., & Upgren, A. R., 1980, AJ, 85, 1390
Mamajek, E.E., Meyer, M.R., & Liebert, J., 2002, AJ, 124, 1670 (MML02)
Meyer, M.R., et al., 2002, The Origins of Stars and Planets: The VLT View. Proceedings of the ESO Workshop held in Garching, Germany, 24–27 April 2001, p. 463.
Sartori, M.J., Lépine, J.R.D., & Dias, W.S., 2003, A&A, in press (SLD03)
Schmidt-Kaler, Th., 1982, in Landolt-Börnstein: Numerical Data and Functional Relationships in Science and Technology, eds. K. Schaífers & H. H. Voigt, (Berlin: Springer-Verlag)
Smart, W.M., 1968, Stellar Kinematics, (Longmans Green & Co Ltd: London)
Torra, J., Fernández, D., & Figueras, F., 2000, A&A, 359, 82
de Zeeuw et al., 1999, AJ, 117, 354
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Mamajek, E.E. (2003). Solar-Type Post-T Tauri Stars in the Nearest OB Subgroups. In: Lépine, J., Gregorio-Hetem, J. (eds) Open Issues in Local Star Formation. Astrophysics and Space Science Library, vol 299. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2600-5_4
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DOI: https://doi.org/10.1007/1-4020-2600-5_4
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