Vv. Nesterov et al., A 2ND HD EXTENSION - A CATALOG OF POSITIO NS, PROPER MOTIONS, MAGNITUDES, AND SPECTRAL TYPES FOR 86933 STARS, ASTRONOM ZH, 73(2), 1996, pp. 189-193
The Henry Draper Extension Charts (HDEC), published in the form of fin
ding charts, contain spectral classifications for roughly 87 000 10 -
11(m) stars. These highly valuable data are virtually unused by modern
(computer-based) astronomy. A pilot project performed in 1991 demonst
rated the possibility of transforming the HDEC into a star catalog. In
this paper, we present a final HDEC catalog, which provides accurate
positions, proper motions, magnitudes, and spectral types for 86933 HD
EC stars.