The distance to the Orion Nebula
K. M. Menten (1), M. J. Reid (2), J. Forbrich (1,2), A. Brunthaler (1), ((1) MPIfR, (2) CfA)
TL;DR
This paper measures the distance to the Orion Nebula using VLBA parallax, refining stellar luminosity and age estimates, and analyzing proper motions to understand cluster origins.
Contribution
It provides a precise parallax-based distance to the Orion Nebula and initial proper motion data to study cluster dynamics.
Findings
Distance to Orion Nebula: 414 +/- 7 pc
Improved calibration of young star luminosities and ages
Proper motions of cluster stars measured
Abstract
We have used the Very Long Baseline Array to measure the trigonometric parallax of several member stars of the Orion Nebula Cluster showing non-thermal radio emission. We have determined the distance to the cluster to be 414 +/- 7 pc. Our distance determination allows for an improved calibration of luminosities and ages of young stars. We have also measured the proper motions of four cluster stars which, when accurate radial velocities are measured, will put strong constraints on the origin of the cluster.
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