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Astronomy Tea Talks at Caltech

Mondays, Robinson 106
Tea:  4.00pm
Talk: 4.15pm

Organized by:

2008 - 2009 season:
13 January 2009
Laurent Loinard (UNAM)

"The Space Distribution of Nearby Star-formation"

Using the excellent astrometry capabilities of the Very Long Baseline
Array, we have measured the trigonometric parallax (and the proper
motions) of a number of young stars in several nearby star-forming
regions with a precision better than a few percents. This represents
an improvement by one to two orders of magnitude over previous
determinations. In particular, we have found that the distance to the
core of Ophiuchus is 120 ± 4.5 pc, and we have confirmed that the
mean distance to Taurus is 140 pc. Our data also allow us to determine
the 3D structure of the regions under study. In the case of Taurus, we
have shown that the total extent of the complex along the line of
sight is about 30 pc, the eastern portion being on the far side and
the region around L1495 on the near side. Finally, the proper motion
measurements, combined with existing radial velocities, allow us to
describe the internal kinematics of the regions under study. A full
spatio-kinematical description of star- forming regions, therefore,
becomes possible.

I will end my talk by mentioning preliminary results in other regions
(particularly Serpens and Cepheus), as well as longer-terms prospects.

More astronomy-related talks
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Last modified on 20th Jul 2011 by Scott Schnee.  

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