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Limb-Darkening of a K Giant in the Galactic Bulge: PLANET Photometry of MACHO 97-BLG-28
The PLANET Collaboration, M. D. Albrow, J. -P. Beaulieu +16
We present the PLANET photometric dataset for the binary-lens microlensing event MACHO 97-BLG-28 consisting of 696 I and V-band measurements, and analyze it to determine the radial…
Spectroscopy of MACHO 97-SMC-1: self-lensing within the SMC
Kailash C. Sahu, M. S. Sahu
More than a dozen microlensing events have been detected so far towards the LMC and 2 towards the SMC. If all the lenses are in the Galactic halo, both the LMC and the SMC events a…
The 1995 Pilot Campaign of PLANET: Searching for Microlensing Anomalies through Precise, Rapid, Round-the-Clock Monitoring
The PLANET Collaboration, M. Albrow, J. -P. Beaulieu +13
PLANET (the Probing Lensing Anomalies NETwork) is a worldwide collaboration of astronomers whose primary goal is to monitor microlensing events densely and precisely in order to de…
The Fading Optical Counterpart of GRB~970228, Six Months and One Year Later
A. S. Fruchter, E. Pian, S. E. Thorsett +20
We report on observations of the fading optical counterpart of the gamma-ray burst GRB 970228, made with the Hubble Space Telescope STIS CCD approximately six months after outburst…
The Relative Lens-Source Proper Motion in MACHO 98-SMC-1
The PLANET Collaboration, M. D. Albrow, J. -P. Beaulieu2 +18
We present photometric and spectroscopic data for the second microlensing event seen toward the Small Magellanic Cloud (SMC), MACHO-98-SMC-1. The lens is a binary. We resolve the c…
Astrometric Microlensing of Stars
Martin Dominik, Kailash C. Sahu
Due to dramatic improvements in the precision of astrometric measurements, the observation of light centroid shifts in observed stars due to intervening massive compact objects (`a…
Birth and early evolution of a planetary nebula
M. Bobrowsky, K. C. Sahu, M. Parthasarathy +1
The final expulsion of gas by a star as it forms a planetary nebula --- the ionized shell of gas often observed surrounding a young white dwarf --- is one of the most poorly unders…
HST/STIS Observations of the Optical Counterpart to GRB 970228
Andrew S. Fruchter, Elena Pian, Stephen E. Thorsett +14
We report on observations of the fading optical counterpart of the gamma-ray burst GRB 970228, made on 4~September~1997 using the STIS CCD on the Hubble Space Telescope. The unreso…