Measuring stellar proper motions in crowded fields with SIM

Details Measuring stellar proper motions in crowded fields with SIM Measuring stellar proper motions in crowded fields with SIM

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4852..639b&link_type=abstract

Interferometry in Space. Edited by Shao, Michael. Proceedings of the SPIE, Volume 4852, pp. 639-644 (2003).

Astronomy and Astrophysics

Astronomy

Scientific paper

Astrometry in crowded fields is an important component of the science program of the Space Interferometry Mission (SIM). Resolving multiple point sources within the SIM beam, or imaging of complicated, extended source structures requires a (large) number of interferometer baselines. As the spacecraft design keeps evolving, the impact on various key projects needs to be studied. In this paper, we discuss the capabilities of the latest SIM design (with only two baselines available for science measurements) for measuring stellar proper motions in crowded fields. Using the nucleus of the Andromeda Galaxy (M 31) as a case study, we quantify the roll angle increment needed to enable such measurements with the reduced SIM baseline set. In particular, we demonstrate that SIM can measure Keplerian motion of luminous stars around the 300 million solar mass black hole in M 31, provided that the spacecraft roll angle can be chosen in increments of around 4 degrees or smaller.

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