SiO maser astrometry of the red transient V838 Monocerotis

Abstract

We present multi-epoch observations with the VLBA of SiO maser emission in the v=1, J=1-0 transition at 43 GHz from the remnant of the red nova V838 Mon. We model the positions of maser spots to derive a parallax of 0.166+/-0.060 mas. Combining this parallax with other distance information results in a distance of 5.6+/-0.5 kpc, which agrees with an independent geometric distance of 6.1+/-0.6 kpc from modeling polarimetry images of V838 Mon's light echo. Combining these results, and including a weakly constraining Gaia DR2 parallax, yields a best estimate of distance of 5.9+/-0.4 kpc. The maser spots are located close to the peaks of continuum at ~225 GHz and SiO J=5-4 thermal emission detected with ALMA. The proper motion of V838 Mon confirms its membership in a small open cluster in the Outer spiral arm of the Milky Way.

Accepted for publication in A&A

References in corpus (8)

• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• The VST Photometric Halpha Survey of the Southern Galactic Plane and Bulge (VPHAS+)
• V838 Monocerotis: A Geometric Distance from Hubble Space Telescope Polarimetric Imaging of its Light Echo
• Keck/HIRES spectroscopy of V838 Monocerotis in October 2005
• A Young Stellar Cluster Surrounding the Peculiar Eruptive Variable V838 Monocerotis
• V838 Monocerotis: the central star and its environment a decade after outburst
• The continued optical to mid-IR evolution of V838 Monocerotis
• Resolving the distance controversy for Sharpless 269: A possible kink in the outer arm

Cited by in corpus (12)

• Molecular remnant of Nova 1670 (CK Vulpeculae). II. A three-dimensional view on the gas distribution and velocity field
• Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631
• Lithium in coalesced non-compact stars
• Molecules in the peculiar age-defying source IRAS 19312+1950
• Parameters of the Galactic Spiral Density Wave from Masers with Parallax Errors Less Than 10%
• Study of the Galactic Rotation Based on Masers and Radio Stars with VLBI Measurements of Their Parallaxes
• OGLE-2002-BLG-360: a dusty anomaly among red nova remnants
• V838 Mon: A slow waking up of Sleeping Beauty?
• The luminous red nova AT 2018bwo in NGC 45 and its binary yellow supergiant progenitor
• V838 Monocerotis as seen by ALMA: a remnant of a binary merger in a triple system
• The Infrared Evolution of Dust in V838 Monocerotis
• On the Nature of the Protoplanetary Nebula OH\,231.8+4.2