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Imaging With STIS: Astronomy at V = 30
Michael D. Gregg, Dante Minniti
In February, 1997, the second Space Shuttle servicing mission to the Hubble Observatory will install the Space Telescope Imaging Spectrograph (STIS). This new instrument will great…
Cepheids in the LMC: Results from the MACHO Project
The MACHO Collaboration, D. L. Welch, C. Alcock +19
The approximately 1500 Cepheid variables in 22 LMC fields of the MACHO Project survey have been calibrated and analysed. In this paper, we report improved period ratios for a total…
The MACHO Project LMC Variable Star Inventory IV: Multimode RR Lyrae Stars, Distance to the LMC and Age of the Oldest Stars
C. Alcock, R. A. Allsman, D. Alves +16
We report the discovery of 73 double-mode RR Lyrae (RRd) stars in fields near the bar of the LMC. The stars are detected among the MACHO database of short-period variables that cur…
Starcounts in the Hubble Deep Field: Constraining Galactic Structure Models
R. A. Mendez, D. Minniti, G. de Marchi +2
Stellar sources are identified in the Hubble Deep Field, and accurate colours and magnitudes are presented. The predictions of a Galactic starcounts model are compared with the fai…
Dwarf Galaxies Also Have Stellar Halos
Dante Minniti, Albert Zijlstra
We present evidence for the existence of an old stellar halo in the dwarf irregular galaxy WLM, an isolated member of the Local Group. The halo consists of population-II stars, wit…
MACHO Project Photometry of RR Lyrae Stars in the Sgr Dwarf Galaxy
C. Alcock, R. A. Allsman, D. R. Alves +17
We report the discovery of 30 type a,b RR Lyrae (RRab) which are likely members of the Sagittarius (Sgr) dwarf galaxy. Accurate positions, periods, amplitudes and magnitudes are pr…