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Title:
A Parallactic Distance of 389+24-21 Parsecs to the Orion Nebula Cluster from Very Long Baseline Array Observations
Authors:
Sandstrom, Karin M.; Peek, J. E. G.; Bower, Geoffrey C.; Bolatto, Alberto D.; Plambeck, Richard L.
Affiliation:
AA(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720; ), AB(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720), AC(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720), AD(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720), AE(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720)
Publication:
The Astrophysical Journal, Volume 667, Issue 2, pp. 1161-1169. (ApJ Homepage)
Publication Date:
10/2007
Origin:
UCP
ApJ Keywords:
Astrometry, Galaxy: Open Clusters and Associations: Individual: Name: Orion Nebula Cluster, Stars: Distances, stars: individual (GMR A), Techniques: Interferometric
DOI:
10.1086/520922
Bibliographic Code:
2007ApJ...667.1161S

Abstract

We determine the parallax and proper motion of the flaring, nonthermal radio star GMR A, a member of the Orion Nebula Cluster, using Very Long Baseline Array observations. Based on the parallax, we measure a distance of 389+24-21 pc to the source. Our measurement places the Orion Nebula Cluster considerably closer than the canonical distance of 480+/-80 pc determined by Genzel et al. A change of this magnitude in distance lowers the luminosities of the stars in the cluster by a factor of ~1.5. We briefly discuss two effects of this change-an increase in the age spread of the pre-main-sequence stars, and better agreement between the zero-age main sequence and the temperatures and luminosities of massive stars.
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