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Searching for Failed Supernovae With Astrometric Binaries
Andrew Gould, Samir Salim
Stars in the mass range 8 Msun<M<30 Msun are thought to end their lives as luminous supernovae that leave behind a neutron star. However, if a substantial fraction of these stars i…
Astrometry Survey Missions Beyond the Magnitude Limit
Samir Salim, Andrew Gould, Rob Olling
Three planned astrometry survey satellites, FAME, DIVA, and GAIA, all aim at observing magnitude-limited samples. We argue that substantial additional scientific opportunities are…
Applications of Microlensing to Stellar Astrophysics
Andrew Gould
Over the past decade, microlensing has developed into a powerful tool to study stellar astrophysics, especially stellar atmospheres, stellar masses, and binarity. I review this pro…
M Dwarfs from Hubble Space Telescope Star Counts. IV
Zheng Zheng, Chris Flynn, Andrew Gould +2
We study a sample of about 1400 disk M dwarfs that are found in 148 fields observed with the Wide Field Camera 2 (WFC2) on the Hubble Space Telescope and 162 fields observed with p…
Microlensing by Stellar Black Holes Around Sgr A*
Julio Chaname, Andrew Gould, Jordi Miralda-Escude
We show that at any given time, the Galactocentric black hole Sgr A* is expected to be microlensing N(lens)=1.7 bulge stars if the threshold of detectability of the fainter image i…
Analytic Study of Grid Star and Reference Star Selection for the Space Interferometry Mission
Andrew Gould
Grid stars and reference stars provide the fundamental global and local astrometric reference frames for observations by the Space Interferometry Mission. They must therefore be as…