Aims: Accurate astrometry is required to reliably cross-match 20th-century catalogues against 21st-century surveys. The present work aims to provide such astrometry for the 625 entries of the Bohannan & Epps (BE74) catalogue of Hα emission-line stars. Methods: BE74 targets have been individually identified in digital images and, in most cases, unambiguously matched to entries in the UCAC4 astrometric catalogue. Results: Sub-arcsecond astrometry is now available for almost all BE74 stars. Several identification errors in the literature illustrate the perils of relying solely on positional coincidences using poorer-quality astrometry.
Cite
@article{arxiv.1210.1837,
title = {Improved astrometry for the Bohannan & Epps catalogue},
author = {Ian D. Howarth},
journal= {arXiv preprint arXiv:1210.1837},
year = {2015}
}