Publications (10)
Close Binary Companions to APOGEE DR16 Stars: 20,000 Binary-star Systems Across the Color-Magnitude Diagram
Adrian M. Price-Whelan, David W. Hogg, Hans-Walter Rix +20
Many problems in contemporary astrophysics---from understanding the formation of black holes to untangling the chemical evolution of galaxies---rely on knowledge about binary stars…
First results from SAM-FP: Fabry-Perot observations with ground-layer adaptive optics - the structure and kinematics of the core of 30 Doradus
Claudia Mendes de Oliveira, Philippe Amram, Bruno Quint +3
The aim of this paper is to present the first data set obtained with SOAR Adaptive Module-Fabry-Parot (SAM-FP), a Fabry-Perot instrument mounted inside the SOAR telescope Adaptive-…
Carina's Defiant Finger: HST Observations of a Photoevaporating Globule in NGC3372
Nathan Smith, Rodolfo Barba, Nolan R. Walborn
We present HST/WFPC2 images of a prominent externally-ionized molecular globule in the Carina Nebula (NGC3372), supplemented with ground-based IR images and visual-wavelength spect…
Close companions around young stars
Marina Kounkel, Kevin Covey, Maxwell Moe +26
Multiplicity is a fundamental property that is set early during stellar lifetimes, and it is a stringent probe of the physics of star formation. The distribution of close companion…
Detailed chemical composition and orbit of the new globular cluster FSR1758: Implications for the accretion of the Sequoia dwarf galaxy onto the Milky Way
Sandro Villanova, Lorenzo Monaco, Julia O'Connell +4
We present detailed chemical abundances, radial velocities and orbital parameters for FSR 1758, a recently discovered star cluster in the direction of the Galactic Bulge. High reso…
The HD5980 multiple system: Masses and evolutionary status
Gloria Koenigsberger, Nidia Morrell, D. John Hillier +5
New spectroscopic observations of the LBV/WR multiple system HD5980 in the Small Magellanic Cloud are used to address the question of the masses and evolutionary status of the two…
Wind structure and luminosity variations in the WR/LBV HD 5980
Leonid N Georgiev, Gloria Koenigsberger, D John Hillier +3
Over the past 40 years, the massive LBV/WR system HD 5980 in the Small Magellanic Cloud has undergone a long-term S Doradus type variability cycle and two brief and violent eruptio…
The puzzling properties of the magnetic O star Tr16-22
Yael Naze, Rodolfo Barba, Stefano Bagnulo +4
(abridged version) Context : The detection of bright, hard, and variable X-ray emission in Tr16-22 prompted spectropolarimetric observations of this star, which in turn led to the…
Bona-fide, strong-variable galactic Luminous Blue Variable stars are fast rotators: detection of a high rotational velocity in HR Carinae
Jose H. Groh, Augusto Damineli, D. John Hillier +6
We report optical observations of the Luminous Blue Variable (LBV) HR Carinae which show that the star has reached a visual minimum phase in 2009. More importantly, we detected abs…
The symbiotic binary system RX Puppis: a possible recurrent nova with a Mira companion
Joanna Mikolajewska, Estela Brandi, Warren Hack +4
We present an analysis of photometric and spectroscopic observations of the symbiotic binary system RX Pup with the aims of developing a reliable binary for the system and identify…