Visual Observability of the Cassiopeia A Supernova
Abstract
It is generally believed that the explosion which gave birth to the Cassiopeia A supernova remmant resulted from core collapse of a hydrogen-deficient star. A progenitor that has lost all its hydrogen envelope and part of its helium envelope would lead to an explosion with the optical properties of a Type Ic supernova. There is evidence, if not general agreement, that Flamsteed observed the Cas A supernova as a sixth magnitude object in August, 1680. If an explosion with a typical SNIc light curve at the position and distance of Cas A attained maximum luminosity during the winter of 1679-1680, it would at that time have been poorly situated for visual observation, as its upper culmination would have taken place during daylight, while in August, between 170-200 days after peak luminosity, it would have been a sixth magnitude star.
Cite
@article{arxiv.0710.2345,
title = {Visual Observability of the Cassiopeia A Supernova},
author = {J. A. Morgan},
journal= {arXiv preprint arXiv:0710.2345},
year = {2008}
}
Comments
8 pages; submitted to Observatory Magazine. Revisions and minor corrigenda