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- W77276163 abstract "We investigate the paths of several bona fide members of the young association around the star TW Hydrae (TWA) with accurate distances, proper motions and radial velocities. Extensive Monte-Carlo simulations are employed to estimate the uncertainties of derived parameters. We find that three of the previously identified members, TWA 1, TWA 4 and TWA 11, together with three other young nearby stars, HD 139084, HD 220476 and, possibly, Vega, form a rapidly expanding association with an expansion age of 4.7 ±0.6 Myr. Vega has been identified as a λ Bootis-type star and a rapid rotator seen almost pole-on; therefore, Vega may be a very young star despite its moderate metal deficiency. Initial velocities of the member stars with respect to the common center of mass range from 4 to 10 km s−1. A characteristic size of the association in the initial configuration is 21 pc, which may be somewhat biased upwards due to the remaining uncertainties in the observational data. The Lower Centaurus Crux (LCC) OB association passed near the TWA, at a distance of 36± 6 pc, 11 Myr ago. A plausible scenario that accounts for the difference between the isochrone age (' 10 Myr) and expansion age (5 Myr), is that moderate star formation was stimulated in the TWA progenitor cloud by the near passage of the LCC, but that the newly formed stars were not released from the cloud until a subsequent collision with another molecular cloud in the North Ophiuchus region." @default.
- W77276163 created "2016-06-24" @default.
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- W77276163 date "2003-01-01" @default.
- W77276163 modified "2023-09-26" @default.
- W77276163 title "TWA as a Rapidly Expanding Mini-Association and Vega as Its Possible Member" @default.
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