First ISOCAM images of the Milky Way

ISOGAL is a 15 μm ISOCAM survey of ∼ 12 deg2 in the Galactic Plane interior to |ℓ| = 45°. In combination with IJK data from the near-infrared southern sky survey DENIS, the ISO images allow the first detailed study of stellar populations throughout the inner Galaxy. We present preliminary results from a test observation at ℓ = 45° with 6" pixels and completeness limit 8 mJy. Of the ∼ 3000 sources deg2 detected, about half are KM giants, seen through extinction of up to Av, ∼, 30,while most of the remainder are probably dusty young stars. Although away from bright IRAS regions, the field displays spectacular emission features, and, unexpectedly, a number of regions which are optically thick at 15 μm. The dark regions are presumably dense filaments with Av, >, 25

Martian atmosphere as observed by VIRTIS‐M on Rosetta spacecraft

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/95134/1/jgre2651.pd

The DENIS Point Source Catalogue towards the Magellanic Clouds

Original article can be found at: http://www.aanda.org/ Copyright The European Southern ObservatoryPeer reviewe

An absolute calibration of DENIS (deep near infrared southern sky survey)

Original article can be found at: http://www.aanda.org/ Copyright The European Southern ObservatoryAn absolute calibration of the DENIS photometric system is presented. It includes the determination of the overall transmission profiles in the 3 bands, namely i, J and Ks, combining contributions from atmosphere, telescope mirrors, instrument lenses and dichroics, filters, and detectors. From these normalized pro les, isophotal and effective wavelengths are computed, using the same synthetic Vega spectrum as that used to support the absolute calibration of many other ground-based and spaceborne photometric systems. Flux densities at zero magnitude are derived and integrated to give in-band fluxes, which are used to compute theoretical zero-points and compare them to observed ones, yielding estimates of the overall throughput of the whole system.Peer reviewe

First ISOCAM Images of the Milky Way

ISOGAL is a 15μm ISOCAM survey of ~12deg^2^ in the Galactic Plane interior to |l|=45°. In combination with IJK data from the near-infrared southern sky survey DENIS, the ISO images allow the first detailed study of stellar populations throughout the inner Galaxy. We present preliminary results from a test observation at l= -45° with 6" pixels and completeness limit 8mJy. Of the ~3000 sources deg^-2^ detected, about half are KM giants, seen through extinction of up to A_v_~30, while most of the remainder are probably dusty young stars. Although away from bright IRAS regions, the field displays spectacular emission features, and, unexpectedly, a number of regions which are optically thick at 15μm. The dark regions are presumably dense filaments with A_v_>25

CoRoT Measures Solar-Like Oscillations and Granulation in Stars Hotter Than the Sun

Oscillations of the Sun have been used to understand its interior structure. The extension of similar studies to more distant stars has raised many difficulties despite the strong efforts of the international community over the past decades. The CoRoT (Convection Rotation and Planetary Transits) satellite, launched in December 2006, has now measured oscillations and the stellar granulation signature in three main sequence stars that are noticeably hotter than the sun. The oscillation amplitudes are about 1.5 times as large as those in the Sun; the stellar granulation is up to three times as high. The stellar amplitudes are about 25% below the theoretic values, providing a measurement of the nonadiabaticity of the process ruling the oscillations in the outer layers of the stars