Search Publications
Intriguing X-ray and optical variations of the γ Cassiopeiae analog HD 45314
Schmitt, J. H. M. M.; Miroshnichenko, A. S.; Zharikov, S. V. +11 more
Context. A growing number of Be and Oe stars, named the γ Cas stars, are known for their unusually hard and intense X-ray emission. This emission could either trace accretion by a compact companion or magnetic interaction between the star and its decretion disk.
Aims: To test these scenarios, we carried out a detailed optical monitoring of HD…
Optical/X-ray correlations during the V404 Cygni June 2015 outburst
Mas-Hesse, J. M.; Charles, P. A.; Gandhi, P. +6 more
Context. We present a multiwavelength analysis of the simultaneous optical and X-ray light curves of the microquasar V404 Cyg during the June 2015 outburst.
Aims: We have performed a comprehensive analysis of all the INTEGRAL/IBIS, JEM-X, and OMC observations during the brightest epoch of the outburst, along with complementary NuSTAR, AAVSO, …
Statistics of the polarized submillimetre emission maps from thermal dust in the turbulent, magnetized, diffuse ISM
Boulanger, F.; Falgarone, E.; Ghosh, T. +4 more
Context. The interstellar medium (ISM) is now widely acknowledged to display features ascribable to magnetized turbulence. With the public release of Planck data and the current balloon-borne and ground-based experiments, the growing amount of data tracing the polarized thermal emission from Galactic dust in the submillimetre provides choice diagn…
New member candidates of Upper Scorpius from Gaia DR1
Merín, B.; Riviere-Marichalar, P.; Wilkinson, S.
Context. Selecting a cluster in proper motion space is an established method for identifying members of a star-forming region. The first data release from Gaia (DR1) provides an extremely large and precise stellar catalogue, which when combined with the Tycho-2 catalogue gives the 2.5 million parallaxes and proper motions contained within the Tych…
Properties of dust in the detached shells around U Antilae, DR Serpentis, and V644 Scorpii
De Beck, E.; Mecina, M.; Maercker, M. +3 more
Context. Asymptotic giant branch (AGB) stars experience strong mass loss driven by dust particles formed in the upper atmospheres. The dust is released into the interstellar medium, and replenishes galaxies with synthesised material from the star. The dust grains further act as seeds for continued dust growth in the diffuse medium of galaxies. As …
Ongoing astrometric microlensing events of two nearby stars
Demleitner, M.; Bastian, U.; Wambsganss, J. +1 more
Context. Astrometric microlensing is an excellent tool to determine the mass of stellar objects. By measuring the astrometric shift of a background source star in combination with precise predictions of its unlensed position and of the lens position, gravitational lensing allows to one determine the mass of the lensing star with a precision of 1%,…
Identifying quasars with astrometric and mid-infrared methods from APOP and ALLWISE
Yan, Qing-Zeng; Liao, Shilong; Qi, Zhaoxiang +5 more
Context. Quasars are spatially stationary, and they are essential objects in astrometry when defining reference frames. However, the census of quasars is far from complete. Mid-infared colors can be used to find quasar candidates because active galactic nuclei (AGNs) show a peculiar appearance in mid-infrared color, but these methods are incapable…
C+ distribution around S 1 in ρ Ophiuchi
Güsten, R.; Mookerjea, B.; Sandell, G. +2 more
We analyze a [C II] 158 µm map obtained with the L2 GREAT receiver on SOFIA of the reflection nebula illuminated by the early B star S 1 in the ρ Oph A cloud core. This data set has been complemented with maps of CO(3-2), 13CO(3-2), and C18O(3-2), observed as a part of the James Clerk Maxwell Telescope (JCMT) Gould Belt…
Searching for g modes. I. A new calibration of the GOLF instrument
Corbard, T.; Appourchaux, T.; Boumier, P. +1 more
Context. The recent claims of g-mode detection have restarted the search for these potentially extremely important modes. These claims can be reassessed in view of the different data sets available from the SoHO instruments and ground-based instruments.
Aims: We produce a new calibration of the GOLF data with a more consistent p-mode amplitud…
More about solar g modes
Fossat, E.; Schmider, F. X.
Context. The detection of asymptotic solar g-mode parameters was the main goal of the GOLF instrument onboard the SOHO space observatory. This detection has recently been reported and has identified a rapid mean rotation of the solar core, with a one-week period, nearly four times faster than all the rest of the solar body, from the surface to the…