Luminous Red Nova AT 2019zhd, a new merger in M 31
Luminous Red Nova AT 2019zhd, a new merger in M 31
We present the follow-up campaign of the luminous red nova (LRN) AT~2019zhd, the third event of this class observed in M 31. The object was followed by several sky surveys for about five months before the outburst, during which it showed a slow luminosity rise. In this phase, the absolute …