Search Publications
Diameter and photospheric structures of Canopus from ;AMBER/VLTI interferometry
Millour, F.; Domiciano de Souza, A.; Bendjoya, P. +2 more
Context: Direct measurements of fundamental parameters and photospheric structures of post-main-sequence intermediate-mass stars are required for a deeper understanding of their evolution.
Aims: Based on near-IR long-baseline interferometry we aim to resolve the stellar surface of the F0 supergiant star Canopus, and to precisely measure its an…
INTEGRAL, XMM-Newton and ESO/NTT identification of AX J1749.1-2733: an obscured and probably distant Be/X-ray binary
Chaty, S.; Zurita Heras, J. A.
Context: AX J1749.1-2733 is an unclassified transient X-ray source discovered during surveys by ASCA in 1993-1999. The transient behaviour and the short and bright flares of the source have led to the idea that it is part of the recently revealed subclass of supergiant fast X-ray transients.
Aims: A multi-wavelength study in NIR, optical, X-ra…
Near-IR bispectrum speckle interferometry, AO imaging polarimetry, and radiative transfer modeling of the proto-planetary nebula Frosty Leonis
Weigelt, G.; Hofmann, K. -H.; Schertl, D. +4 more
Aims: We combined bispectrum speckle interferometry, adaptive optics (AO) imaging polarimetry, and radiative transfer modeling of polarized light to derive various physical properties of the proto-planetary nebula Frosty Leo.
Methods: We performed bispectrum K'-band speckle interferometry and H- and K-band imaging polarimetry of Frosty Leo usi…
XMM-Newton observations of the Small Magellanic Cloud: XMMU J004814.1-731003, a 25.55 s Be/X-ray binary pulsar
Pietsch, W.; Haberl, F.; Sasaki, M. +2 more
Aims: To investigate candidates for Be/X-ray binaries in the Small Magellanic Cloud (SMC), we observed a region around the emission nebula N19 with XMM-Newton in October 2006.
Methods: We analysed the EPIC data of the detected point sources to derive their spectral and temporal characteristics.
Results: We detected X-ray pulsations with a …
Gomez's Hamburger (IRAS 18059-3211): a pre main-sequence A-type star
Bujarrabal, V.; Young, K.; Fong, D.
Aims: We study the nature of Gomez's Hamburger (IRAS 18059-3211; GoHam), a nebula that has been proposed to be a post-AGB object. Such a classification has not been confirmed; instead, we argue that it will be a key object in the study of disks rotating around young stars.
Methods: We present high-resolution SMA maps of CO J = 2-1 in Gomez's H…
Modeling magnetohydrodynamics and non-equilibrium SoHO/UVCS line emission of CME shocks
Raymond, J. C.; Orlando, S.; Reale, F. +1 more
Aims: We provide a guideline to interpret the UltraViolet Coronograph Spectrometer (UVCS) emission lines (in particular O VI and Si XII) during shock wave propagation in the outer solar corona.
Methods: We use a numerical magnetohydrodynamic (MHD) model performing a set of simulations of shock waves generated in the corona and from the result …
Detecting transits from Earth-sized planets around Sun-like stars
Fridlund, M.; Carpano, S.
Context: Detecting regular dips in the light curve of a star is an easy way to detect the presence of an orbiting planet. CoRoT is a Franco-European mission launched at the end of 2006, and one of its main objectives is to detect planetary systems using the transit method.
Aims: In this paper, we present a new method for transit detection and …
Asteroid 2867 Steins. I. Photometric properties from OSIRIS/Rosetta and ground-based visible observations
Jorda, L.; Lamy, P. L.; Barucci, M. A. +6 more
Context: Asteroid 2867 Steins is the first target of the Rosetta space mission with a flyby scheduled in September 2008.
Aims: An early characterization is needed to optimize the flyby parameters and the science operations and to maximize the scientific return. The aim of this article is to characterize the photometric properties of this aster…
Statistics of young starforming complexes in spiral galaxies using NIR photometry
Dottori, H.; Grosbøl, P.
Aims: Very young stellar clusters and cluster complexes may be embedded in dust lanes along spiral arms in disk galaxies and escape detection in visual bands. Observations in the near-infrared K-band offer an almost unbiased view of such clusters or complexes due to the small attenuation by dust at this wavelength. The objective is to determine th…
The Hubble Legacy Archive NICMOS grism data
Kümmel, M.; Haase, J.; Kuntschner, H. +6 more
The Hubble Legacy Archive (HLA) aims to create calibrated science data from the Hubble Space Telescope archive and make them accessible via user-friendly and Virtual Observatory (VO) compatible interfaces. It is a collaboration between the Space Telescope Science Institute (STScI), the Canadian Astronomy Data Centre (CADC) and the Space Telescope …