ANDICAM <i>I</i>- and <i>J</i>-band monitoring of bright inner Galactic late-type stars

Abstract Time-series photometry in the I and J bands of 57 inner Galactic late-type stars, highly probable red supergiant (RSG) is presented here. 38% sample presents significant photometric variations. The variations appear to be correlated, with ΔI ∝ ΔJ × 2.2, ranging from 0.04–1.08 mag, 0.03–0.52 mag. New short periods (&amp;lt;1000 d) could estimated for eight stars range 167–433 d. This work confirms that not contaminated by large-amplitude asymptotic giant branch stars. Furthermore, despite large errors distance, period–luminosity diagram suggests populating same sequence as known RSGs.