I was recently suprised to find a number of 'single star' entries in the Revised NGC / IC catalogue, as I always believed that it contained only Nebula / Galaxy / Clusters etc.
My question is: Despite quite intensive Google'ing on the matter I cannot find any cross referencing between HD or HR star records and NGC / IC 'single star' objects. Do some 'single star' objects in the NGC / IC relate to HD or HR records? Am I being ignorant on this matter? If not is it possible to cross reference these records?
As always, Gercha!