Session 64 - Globular Clusters.
Oral session, Tuesday, January 14
[64.04] Luminosity Differences Between Halo Globular Clusters with Red and Blue Horizontal Branches
S. van den Bergh (HIA/DAO)
Luminosity Differences Between Halo Globular Clusters with
Red and Blue Horizontal Branches
Sidney van den Bergh (HIA/DAO)
Halo globular clusters with red horizontal branches
[(B-R)/(B+V+R)<-0.80] have = -4.82,
compared to = -7.30 for halo clusters with
blue and intermediate-color horizontal branches. A
Kolmogorov-Smirnov test shows that there is only a
0.1% chance that the red and blue HB clusters with
R_GC>10 kpc were drawn from the same parent population.
This suggests that the luminosity function of halo globular
clusters may have become fainter with time. Alternatively,
it might be assumed that metal-rich halo clusters were
formed with lower masses than metal-poor ones.
listing for Tuesday