8 papers
The Initial-Final Mass Relationship: Spectroscopy of White Dwarfs in NGC 2099 (M37)
Jasonjot Singh Kalirai, Harvey B. Richer, David Reitzel +5
We present new observations of very faint white dwarfs (WDs) in the rich open star cluster NGC 2099 (M37). Following deep, wide field imaging of the cluster using CFHT, we have now…
HST Observations of the Main Sequence of M4
H. B. Richer, G. G. Fahlman, J. Brewer +8
This paper presents new results from a photometric study of the main-sequence stars in M4, the closest globular cluster to the sun. Multi-field, multi-epoch observations at approxi…
Reconstructions of the Strong Gravitational Lenses MS 2137 and MS 1455 Using a Two-Stage Inversion Algorithm
P. Newbury, G. G. Fahlman
We propose a new, two-stage algorithm for inverting strong gravitational lenses. The key to the algorithm is decoupling the effects of lens magnification and intrinsic structure in…
B1933+503, a dusty radio quasar at z>2: implications for blank field sub-mm surveys?
Scott C. Chapman, Douglas Scott, Geraint F. Lewis +2
We present a detailed mm-wave and optical study of the gravitational lens system B1933+503, discovered by Sykes et al.(1998) in the radio. This object is probably the most complex…
HST Photometry of the Globular Cluster M4
Rodrigo A. Ibata, Harvey B. Richer, Gregory G. Fahlman +5
This paper presents a detailed description of the acquisition and processing of a large body of imaging data for three fields in the globular cluster M4 taken with the Wide Field a…
Formation of the Milky Way
J. E. Hesser, P. B. Stetson, W. E. Harris +9
We review observational evidence bearing on the formation of a prototypical large spiral galaxy, the Milky Way. New ground- and space-based studies of globular star clusters and dw…