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The WFC3 Galactic Bulge Treasury Program: Metallicity Estimates for the Stellar Population and Exoplanet Hosts
Ferguson, Henry C.; Brown, Thomas M.; Casertano, Stefano +14 more
We present new UV-to-IR stellar photometry of four low-extinction windows in the Galactic bulge, obtained with the Wide Field Camera 3 on the Hubble Space Telescope (HST). Using our five bandpasses, we have defined reddening-free photometric indices sensitive to stellar effective temperature and metallicity. We find that the bulge populations rese…
Transiting exoplanets from the CoRoT space mission. IX. CoRoT-6b: a transiting ``hot Jupiter'' planet in an 8.9d orbit around a low-metallicity star
Mazeh, T.; Aigrain, S.; Alapini, A. +45 more
The CoRoT satellite exoplanetary team announces its sixth transiting planet in this paper. We describe and discuss the satellite observations as well as the complementary ground-based observations - photometric and spectroscopic - carried out to assess the planetary nature of the object and determine its specific physical parameters. The discovery…
A double radio halo in the close pair of galaxy clusters Abell 399 and Abell 401
Govoni, F.; Giovannini, G.; Feretti, L. +1 more
Aims: Radio halos are faint radio sources usually located at the center of merging clusters of galaxies. These diffuse radio sources are rare, having so far been found only in about 30 clusters of galaxies, suggesting that particular conditions are needed to form and maintain them. It is interesting to investigate the presence of radio halos …
A New Method for the Assessment of Age and Age Spread of Pre-main-sequence Stars in Young Stellar Associations of the Magellanic Clouds
Da Rio, Nicola; Gouliermis, Dimitrios A.; Gennaro, Mario
We present a new method for the evaluation of the age and age spread among pre-main-sequence (PMS) stars in star-forming regions in the Magellanic Clouds, accounting simultaneously for photometric errors, unresolved binarity, differential extinction, stellar variability, accretion, and crowding. The application of the method is performed with the …
A Panchromatic View of PKS 0558-504: An Ideal Laboratory to Study the Disk-Jet Link
Papadakis, I. E.; Grupe, D.; Gliozzi, M. +3 more
PKS 0558-504 is the brightest radio-loud Narrow-line Seyfert 1 galaxy (NLS1) at X-ray energies. Here we present results from the radio, optical, UV, and X-ray bands obtained with Swift, XMM-Newton, and the Australia Telescope Compact Array (ATCA) during a ten-day monitoring campaign in 2008 September. The simultaneous coverage at several wavelengt…
Subsurface heat transfer on Enceladus: Conditions under which melting occurs
Ingersoll, Andrew P.; Pankine, Alexey A.
Given the heat that is reaching the surface from the interior of Enceladus, we ask whether liquid water is likely and at what depth it might occur. The heat may be carried by thermal conduction through the solid ice, by the vapor as it diffuses through a porous matrix, or by the vapor flowing upward through open cracks. The vapor carries latent he…
Thermal structure and composition of Jupiter’s Great Red Spot from high-resolution thermal imaging
Fletcher, Leigh N.; Hayward, T. L.; Irwin, P. G. J. +11 more
Thermal-IR imaging from space-borne and ground-based observatories was used to investigate the temperature, composition and aerosol structure of Jupiter's Great Red Spot (GRS) and its temporal variability between 1995 and 2008. An elliptical warm core, extending over 8° of longitude and 3° of latitude, was observed within the cold anticyclonic vor…
The star-formation history of the Small Magellanic Cloud star cluster NGC 419
Girardi, Léo; Rubele, Stefano; Kerber, Leandro
The rich Small Magellanic Cloud (SMC) star cluster NGC 419 has recently been found to present both a broad main-sequence turn-off and a dual red clump of giants in the sharp colour-magnitude diagrams (CMDs) derived from the High-Resolution Channel of the Advanced Camera for Surveys onboard the Hubble Space Telescope. In this work, we apply to the …
Constraints on the origin of the massive, hot, and rapidly rotating magnetic white dwarf RE J 0317-853 from an HST parallax measurement
Jordan, S.; Nelan, E.; Bastian, U. +2 more
Aims: We use the parallax measurements of RE J 0317-853 to determine its mass, radius, and cooling age and thereby constrain its evolutionary origins.
Methods: We observed RE J 0317-853 with the Hubble Space Telescope's Fine Guidance Sensor to measure the parallax of RE J 0317-853 and its binary companion, the non-magnetic white dwarf LB…
Non-radial oscillations in the red giant HR 7349 measured by CoRoT
Auvergne, M.; Baudin, F.; Hatzes, A. P. +13 more
Context. Convection in red giant stars excites resonant acoustic waves whose frequencies depend on the sound speed inside the star, which in turn depends on the properties of the stellar interior. Therefore, asteroseismology is the most robust available method for probing the internal structure of red giant stars.
Aims: Solar-like oscillation…