Spectroastrometry: a new method for direct determination of disc kinematics

Details Spectroastrometry: a new method for direct determination of disc kinematics Spectroastrometry: a new method for direct determination of disc kinematics

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..337..299p&link_type=abstract

The Nature and Evolution of Disks Around Hot Stars, ASP Conference Series, Vol. 337, Proceedings of a meeting held 7-9 July 2004

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The kinematics of discs around hot stars have never been directly measured because the sizes of the discs (˜milli-arcseconds for the closest stars) is small compared to the typical seeing disc (˜arcseconds). We describe a technique -- spectroastrometry -- which has the potential to probe disc kinematics directly on scales below the seeing disc. This technique does not use interferometry, but makes complete use of long-slit spectra, and hence can be used with simple spectrometers. Spectroastrometry may be used on a variety of astrophysical sources with an on-sky asymmetric velocity field. In particular we describe applications to binary objects, and disc kinematics.

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