Determining Distances and Motions of Stars in the TW Hydrae Association for Studying Planet Formation Conditions

Details Determining Distances and Motions of Stars in the TW Hydrae Association for Studying Planet Formation Conditions Determining Distances and Motions of Stars in the TW Hydrae Association for Studying Planet Formation Conditions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p43b1432r&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P43B-1432

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[5749] Planetary Sciences: Fluid Planets / Origin And Evolution

Scientific paper

Distances and proper motions were determined for seven stars of the TW Hydrae association (TWA) using images from the Carnegie Astrometric Planet Search Camera (CAPSCam) on the 100-inch telescope at Las Campanas Observatory. The stars of TWA appear to be transitioning from having the material necessary to form gas giant planets to the late stages of planet formation. In order to study the conditions surrounding these stars and to calculate their age, distances must first be determined. Spatial velocities were calculated from the distances and proper motions measured. The age of TWA was estimated by plotting the positions and velocities of the stars and calculating the instant of closest approach, but the age calculated (1.82 ± .43 Myr) was inconsistent with previous estimates of the age of TWA (5 - 10 Myr), which may suggest that the association is not expanding as expected, or that it is larger than expected. The age of TWA was also estimated by plotting TWA stars on the Hertzprung-Russell diagram and comparing their luminosities to models of pre-main sequence evolution. The TWA stars all had model ages between 2 Myr and 20 Myr. The distance and motion of TWA 14 are inconsistent with those of the other known TWA members; we therefore propose that TWA 14 may not be a member of TWA.

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