32 citations · 172 across the 14 of their papers we have counts for
Showing 2004Show all
2 papers · 1 filter
astro-ph2004
Spectral Types of Field and Cluster O-Stars
Sidney van den Bergh
The recent catalog of spectral types of Galactic O-type stars by Mai'z-Apella'niz et al. has been used to study the differences between the frequencies of various subtypes of O-typ…
astro-ph2004
Shapley-Ames Galaxies in the Blue and Infrared
Sidney van den Bergh
The Shapley-Ames Catalog of 1276 galaxies with B < 12.5 is compared with the Sanders et al. all sky sample of the 629 galaxies with 60 m flux density > 5.24 Jy. The fraction of Sha…