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SiO maser astrometry of the red transient V838 Monocerotis

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arxiv 2004.01488 v1 pith:A37KMTRY submitted 2020-04-03 astro-ph.SR astro-ph.GAastro-ph.IM

SiO maser astrometry of the red transient V838 Monocerotis

Gisela N. Ortiz-Leon , Karl M. Menten , Tomasz Kaminski , Andreas Brunthaler , Mark J. Reid , Romuald Tylenda This is my paper
classification astro-ph.SR astro-ph.GAastro-ph.IM
keywords distancemaserv838parallaxcombiningemissionresultsspots
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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.

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