This study supports the VLA campaign studying SiO maser emissions from 20 Long Period Variables (Miras).

The Karl G. Jansky Very Large Array (VLA) SiO maser monitoring campaign beginning in October of 2018 lasting for at least two years. In particular, the strengths of the SiO maser lines observed at 43 GHz in the radio spectrum are correlated with the phase of the stars in the sample and may allow probing the density in the stellar envelopes. The VLA observations will likely occur about once every 3 weeks, thus sampling of targets ranging from 2 to 4 weeks will guide the interpretation of the radio observations.
These stars were previously observed as part of the Bulge Asymmetries and Dynamical Evolution survey.

Johnson V photometry for all stars is necessary to standardize the radio measurements. Additionally, Johnson R photometry is valuable since these are very red stars.