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Orbital Motions of Binaries in Orion South

Luis A. Zapata, Luis F. Rodríguez

Abstract

We present high-angular resolution ($\simeq 0\rlap.{''}06$) VLA and ALMA observations of Orion South separated by 15.52 years. The purpose of this study was to search for orbital motions in three close ($\simeq 0\rlap.{''}1$) binary systems in the region. We do not detect changes in the position angle of the binaries but in two of the cases we detect significant changes in their separation in the plane of the sky. We use these changes to estimate that the total mass of the binaries is in the $\simeq$1-2 $M_\odot$ range. We also estimate the disk masses from the mm emission. The dust-to-stellar mass ratio is in the range of 0.04 to 0.18, values consistent with those expected for very early stellar evolution (Class 0) protostars.

Orbital Motions of Binaries in Orion South

Abstract

We present high-angular resolution () VLA and ALMA observations of Orion South separated by 15.52 years. The purpose of this study was to search for orbital motions in three close () binary systems in the region. We do not detect changes in the position angle of the binaries but in two of the cases we detect significant changes in their separation in the plane of the sky. We use these changes to estimate that the total mass of the binaries is in the 1-2 range. We also estimate the disk masses from the mm emission. The dust-to-stellar mass ratio is in the range of 0.04 to 0.18, values consistent with those expected for very early stellar evolution (Class 0) protostars.
Paper Structure (10 sections, 6 equations, 1 figure)

This paper contains 10 sections, 6 equations, 1 figure.

Table of Contents

  1. Introduction
  2. Observations
  3. VLA 7 mm
  4. ALMA 3 mm
  5. Analysis
  6. Discussion
  7. Stellar Mass Estimate
  8. Estimation of disk masses from ALMA 3 mm continuum data
  9. The Nature of the Emission at 7 and 3 mm
  10. Conclusions

Figures (1)

  • Figure 1: VLA (left) and ALMA (right) images of 139$-$409 (top), 134$-$411 (middle) and 132$-$413 (bottom). Contours are -4, -3, 3, 4, 6, 8, 10, 20, 40, 60, 80 and 100 times the rms indicated in each panel.