We report on 26 lunar occultation events observed in the context of a program started at Devasthal in 2017. In addition to the customary observations with the 1.3-m telescope, we report here also the first attempts performed with the TIRCAM2 camera at the 3.6-m DOT telescope in the near-IR. The results consist in the first-time angular diameters for two late-type giants, in a measurement of the well-known AGB pulsating variable SW~Vir, and in the measurement of eight small separation binaries one of which is detected for the first time (HR~1860). We also measured the wider binaries SAO~94431 and 55~Tau (twice). The remaining sources were found to be unresolved with upper limits as small as 1~milliarcsecond. We plan to develop further the high-speed capability of the TIRCAM2 instrument, so as to include in our program also more near-infrared, highly extincted sources.
@article{arxiv.2008.03459,
title = {Further milliarcsecond resolution results on cool giants and binary stars from lunar occultations at Devashtal},
author = {A. Richichi and Saurabh Sharma and T. Sinha and R. Pandey and A. Ghosh and D. K. Ojha and A. K. Pandey and M. B. Naik},
journal= {arXiv preprint arXiv:2008.03459},
year = {2020}
}
Comments
Accepted for publication in MNRAS main journal, 7 pages, 3 figures, 3 tables