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The WFC3 Galactic Bulge Treasury Program: A First Look at Resolved Stellar Population Tools
Thomas M. Brown, Kailash Sahu, Manuela Zoccali +12
[Abridged] When WFC3 is installed on HST, the community will have powerful new tools for investigating resolved stellar populations. The WFC3 Galactic Bulge Treasury program will o…
Stellar Proper Motions in the Galactic Bulge from deep HST ACS/WFC Photometry
Will Clarkson, Kailash Sahu, Jay Anderson +11
We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS/WFC on HST. Proper motions are extracted…
Hen 2-104: A close-up look at the Southern Crab
M. Santander-Garcia, R. L. M. Corradi, A. Mampaso +5
The kinematics, shaping, density distribution, expansion distance, and ionized mass of the nebula Hen 2-104, and the nature of its symbiotic Mira are investigated. A combination of…
Planets in the Galactic Bulge: Results from the SWEEPS Project
Kailash C. Sahu, Stefano Casertano, Jeff Valenti +13
The exoplanets discovered so far have been mostly around relatively nearby and bright stars. As a result, the host stars are mostly (i) in the Galactic disk, (ii) relatively massiv…
Long GRBs from binary stars: runaway, Wolf-Rayet progenitors
M. Cantiello, S. -C. Yoon, N. Langer +1
The collapsar model for long gamma-ray bursts requires a rapidly rotating Wolf-Rayet star as progenitor. We test the idea of producing rapidly rotating Wolf-Rayet stars in massive…
Is the Bardeen-Petterson effect responsible for the warping and precession in NGC 4258?
Anderson Caproni, Zulema Abraham, Mario Livio +1
Strong evidence for the presence of a warped Keplerian accretion disc in NGC4258 (M 106) has been inferred from the kinematics of water masers detected at sub-parsec scales. Assumi…