Variable Red Giants Exploration with MASTER Robotic Net: Main Algorithms and Study of Three Mira-type Targets

TL;DR

This paper demonstrates the capabilities of the MASTER robotic telescope network in discovering and analyzing Mira-type variable red giants, providing long-term light curves and astrophysical parameters for three targets.

Contribution

It introduces new methods for transient detection and long-term monitoring of Mira variables using the MASTER robotic network and archival data.

Findings

Discovered and analyzed three Mira-type variables.

Provided 8-year historical light curves and period calculations.

Estimated fundamental astrophysical parameters for the targets.

Abstract

We are discussing the capabilities of MASTER network of robotic telescopes to study variable red giant stars. We report the discovery and present archival light curves for three optical transients, connected with long period variable red giants, based on MASTER Robotic Net all-sky survey observations and archival MASTER light curves at Lomonosov database storage. We demonstrate transient detection frames and light curves for three Mira-type variables: MASTER OT $J083717.54-573411.1$, MASTER OT $J190436.33+192828.7$ and MASTER OT $J07010810-6818548$. Spectroscopically validated carbon star MASTER OT $J07010810-6818548$ shows mean magnitude growth but constant pulsation period which may indicate the presence of a long secondary period. As the result of MASTER wide-field images analysis at Lomonosov supercomputer data storage we present the 8-years historical light curves for all three objects with period calculations for all three Mira-type variables. We estimated fundamental astrophysical parameters for all three Mira-type variables: luminosities, radii, and zero age main sequence (ZAMS) masses.