ARGOS - III. Stellar populations in the Galactic bulge of the Milky Way
- M. Ness, K. Freeman, L. Kiss
- Physics
- 7 December 2012
We present the metallicity results from the ARGOS spectroscopic survey of the Galactic bulge. Our aim is to understand the formation of the Galactic bulge: did it form via mergers, as expected from…
ARGOS – IV. The kinematics of the Milky Way bulge
- M. Ness, K. Freeman, R. Ibata
- Physics
- 26 March 2013
We present the kinematic results from our ARGOS spectroscopic survey of the Galactic bulge of the Milky Way. Our aim is to understand the formation of the Galactic bulge. We examine the kinematics of…
Nearby Debris Disk Systems with High Fractional Luminosity Reconsidered
- A. Moór, P. Ábrahám, T. Henning
- Physics
- 27 March 2006
By searching the IRAS and ISO databases, we compiled a list of 60 debris disks that exhibit the highest fractional luminosity values (fd > 10-4) in the vicinity of the Sun (d < 120 pc). Eleven out of…
Kepler Asteroseismology Program: Introduction and First Results
- R. Gilliland, T. Brown, J. Steffen
- Geology, Physics
- 31 December 2009
Asteroseismology involves probing the interiors of stars and quantifying their global properties, such as radius and age, through observations of normal modes of oscillation. The technical…
Wind Accretion and State Transitions in Cygnus X-1
- D. Gies, C. T. Bolton, L. Kiss
- Physics
- 14 June 2002
We present the results of a spectroscopic monitoring program (from 1998 to 2002) of the Hα emission strength in HDE 226868, the optical counterpart of the black hole binary Cyg X-1. The feature…
Variability in red supergiant stars: pulsations, long secondary periods and convection noise
- L. Kiss, G. Szabó, T. Bedding
- Physics
- 21 August 2006
We study the brightness variations of galactic red supergiant stars using long-term visual light curves collected by the American Association of Variable Star Observers (AAVSO) over the last century.…
THE ORIGIN OF THE SPLIT RED CLUMP IN THE GALACTIC BULGE OF THE MILKY WAY
- M. Ness, K. Freeman, R. Ibata
- Physics, Geology
- 4 July 2012
Near the minor axis of the Galactic bulge, at latitudes b < −5°, the red giant clump stars are split into two components along the line of sight. We investigate this split using the three fields from…
ASYMMETRIC TRANSIT CURVES AS INDICATION OF ORBITAL OBLIQUITY: CLUES FROM THE LATE-TYPE DWARF COMPANION IN KOI-13
KOI-13.01, a planet-sized companion in an optical double star, was announced as one of the 1235 Kepler planet candidates in 2011 February. The transit curves show significant distortion that was…
The Kepler characterization of the variability among A- and F-type stars I. General overview
- K. Uytterhoeven, A. Moya, J. Cleve
- Physics
- 1 July 2011
Context. The Kepler spacecraft is providing time series of photometric data with micromagnitude precision for hundreds of A-F type stars. Aims. We present a first general characterization of the…
Halo globular clusters observed with AAOmega: dark matter content, metallicity and tidal heating
Globular clusters have proven to be essential to our understanding of many important astrophysical phenomena. Here we analyse spectroscopic observations of ten Halo globular clusters to determine…
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