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Horizontal Branch Stars in the Galactic Stellar Halo
Andrew C. Layden
I review the properties of the Galaxy's stellar halo, specifically as traced by horizontal branch stars, but with reference to and in comparison with other stellar tracers. I discu…
Optical Light Curves of the Type Ia Supernovae 1990N and 1991T
P. Lira, Nicholas B. Suntzeff, M. M. Phillips +27
We present UBVRI light curves for the bright Type Ia supernovae SN 1990N in NGC 4639 and SN 1991T in NGC 4527 based on photometry gathered in the course of the Calan/Tololo superno…
The Globular Cluster M54 and the Star Formation History of the Sagittarius Dwarf Galaxy
Andrew C. Layden, Ata Sarajedini
We present a deep color-magnitude diagram in the VI passbands of the globular cluster M54, a member of the Sagittarius dwarf galaxy. The data extend below the cluster's main sequen…
Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304 in May 1994. I. The Ground-Based Campaign
J. E. Pesce, C. M. Urry, L. Maraschi +29
Optical, near-infrared, and radio observations of the BL Lac object PKS2155-304 were obtained simultaneously with a continuous UV/EUV/X-ray monitoring campaign in 1994 May. Further…