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Fast rotating Blue Straggler Stars in the Globular Cluster NGC3201
Alex Billi, Francesco R. Ferraro, Alessio Mucciarelli +7
We used high resolution spectra acquired at the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201.…
All-Sky Faint DA White Dwarf Spectrophotometric Standards for Astrophysical Observatories: The Complete Sample
Tim Axelrod, Abhijit Saha, Thomas Matheson +14
Hot DA white dwarfs have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective te…
Perfecting our set of spectrophotometric standard DA white dwarfs
A. Calamida, T. Matheson, E. W. Olszewski +17
We verified for photometric stability a set of DA white dwarfs with Hubble Space Telescope magnitudes from the near-ultraviolet to the near-infrared and ground-based spectroscopy b…
The Most Metal-poor Stars in Omega Centauri (NGC 5139)
Christian I. Johnson, Andrea K. Dupree, Mario Mateo +3
The most massive and complex globular clusters in the Galaxy are thought to have originated as the nuclear cores of now tidally disrupted dwarf galaxies, but the connection between…
Photometry and spectroscopy of faint candidate spectrophotometric standard DA white dwarfs
A. Calamida, T. Matheson, A. Saha +14
We present precise photometry and spectroscopy for 23 candidate spectrophotometric standard white dwarfs. The selected stars are distributed in the Northern hemisphere and around t…
Exploring the Chemical Composition and Double Horizontal Branch of the Bulge Globular Cluster NGC 6569
Christian I. Johnson, R. Michael Rich, Nelson Caldwell +4
Photometric and spectroscopic analyses have shown that the Galactic bulge cluster Terzan 5 hosts several populations with different metallicities and ages that manifest as a double…