SiO maser astrometry of the red transient V838 Monocerotis
Abstract
We present multiepoch observations with the Very Long Baseline Array 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 modeled 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 is in agreement 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 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 the Atacama Large (sub)Millimeter Array. The proper motion of V838 Mon confirms its membership in a small open cluster in the Outer spiral arm of the Milky Way.
Fits images associated with Figs. 2-4 are only available at CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/638/A17- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 2020
- DOI:
- 10.1051/0004-6361/202037712
- arXiv:
- arXiv:2004.01488
- Bibcode:
- 2020A&A...638A..17O
- Keywords:
-
- masers;
- techniques: interferometric;
- astrometry;
- supergiants;
- stars: distances;
- stars: individual: V838 Monocerotis;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- Accepted for publication in A&