Kinematic analysis and membership status of TWA22ABR

Details Kinematic analysis and membership status of TWA22ABR Kinematic analysis and membership status of TWA22ABR

2009-06-22

arxiv.org/abs/0906.4100v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 3 figures, to be published in Astron. Astrophys

Scientific paper

TWA22 was initially regarded as a member of the TW Hydrae association (TWA). In addition to being one of the youngest (~8Myr) and nearest (~20pc) stars to Earth, TWA22 has proven to be very interesting after being resolved as a tight, very low-mass binary. This binary can serve as a very useful dynamical calibrator for pre-main sequence evolutionary models. However, its membership in the TWA has been recently questioned despite due to the lack of accurate kinematic measurements. Based on proper motion, radial velocity, and trigonometric parallax measurements, we aim here to re-analyze the membership of TWA22 to young, nearby associations. Using the ESO NTT/SUSI2 telescope, we observed TWA22AB during 5 different observing runs over 1.2 years to measure its trigonometric parallax and proper motion. This is a part of a larger project measuring trigonometric parallaxes and proper motions of most known TWA members at a sub-milliarcsec level. HARPS at the ESO 3.6m telescope was also used to measure the system's radial velocity over 2 years. We report an absolute trigonometric parallax of TWA22AB, 57.0mas, corresponding to a distance 17.5pc from Earth. Measured proper motions of TWA22AB are -175.8mas/yr in right ascension and -21.3mas/yr in declination. Finally, from HARPS measurements, we obtain a radial velocity 14.8km/s.

Affiliated with

Also associated with

No associations

Rating

Kinematic analysis and membership status of TWA22ABR does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Kinematic analysis and membership status of TWA22ABR, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Kinematic analysis and membership status of TWA22ABR will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-496187