Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345513s&link_type=abstract
American Astronomical Society, AAS Meeting #213, #455.13; Bulletin of the American Astronomical Society, Vol. 41, p.356
Astronomy and Astrophysics
Astronomy
Scientific paper
In this SIM Science Study, we will be examining the potential benefits of applying the rotational parallax method to galaxies (specifically to M31 and M33). The rotational parallax method combines differential proper motion measurements of stars in a galaxy with radial velocity measurements to obtain a geometrical determination of distance. We argue that luminosity independent distance determinations are needed to provide confidence as distance indicators reach the 1% level in accuracy. With ROBUST 1% distances to M31 and M33 we also obtain accurate luminosities to millions of resolved stars that will be very helpful for calibration of the more familiar distance indicators: Cepheids, RR-Lyrae, Tip of the red giant branch, Red Clump, Tully-Fisher, planetary nebulae, eclipsing binaries, etc. In addition, the SIM data will also provide unprecedented information about internal dynamics in M31 and M33 by revealing non-circular velocities in these galaxies caused by spiral wave patterns, mergers, bars, or warps.
This project is funded by the Space Interferometry Project (NASA/JPL).
Olling Rob
Shaya Edward J.
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