Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7508r&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #75.08; Bulletin of the American Astronomical Society, Vol. 24, p.1242
Astronomy and Astrophysics
Astronomy
Scientific paper
By comparing proper motion and radial velocity dispersions in a globular cluster, one can derive an astrometric distance to the cluster that is independent of any standard candle assumptions. This technique is potentially very powerful for calibrating the absolute magnitude of the horizontal branch. A preliminary MV-[Fe/H] relation is derived here using the currently available astrometric distances to several clusters. The derivation favors a large slope, but smaller slopes cannot be ruled out. Future work will use more accurate astrometric distances (via dynamical models) and additional clusters. This work has been partially supported by the NSF.
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