http://arxiv.org/abs/2105.09018
We reobserved in the $R_C$ and $i’{Sloan}$ bands, during the years 2020-2021, seven Mira variables in Cassiopeia, for which historical $i’{Sloan}$ light curves were available from Asiago Observatory plates taken in the years 1967-84. The aim was to check if any of them had undergone a substantial change in the period or in the light curve shape. Very recent public data form ZTF-DR5 were also used to expand our time base window. A marked color change was detected for all the stars along their variability cycle. The star V890 Cas showed a significant period decrease of 12\% from 483 to 428 days, one of the largest known to date. All the stars, save AV Cas, showed a smaller variation amplitude in the recent CCD data, possibly due to a photometric accuracy higher than that of the photographic plates.
R. Nesci and G. Rocchi
Thu, 20 May 21
28/56
Comments: 12 pages, 8 figures, accepted for Open European Journal on Variable Stars (OEJV)
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