Search Publications
The spectroscopic orbits and physical parameters of GG Carinae
Ferrer, O. E.; Quiroga, C.; Brandi, E. +3 more
Aims: GG Car is an eclipsing binary classified as a B[e] supergiant star. The aims of our study are to improve the orbital elements of the binary system in order to obtain the actual orbital period of this system. We also compare the spectral energy distribution of the observed fluxes over a wide wavelength range with a model of a circumstell…
New insights on Stephan's Quintet: exploring the shock in three dimensions
Vílchez, J. M.; Petropoulou, V.; López-Martín, L. +2 more
Aims: We study the ionized gas emission from the large scale shock region of Stephan's Quintet (SQ).
Methods: We carried out integral field unit (IFU) optical spectroscopy on three pointings in and near the SQ shock. We used Potsdam MultiAperture Spectrometer (PMAS) on the 3.5 m Calar Alto telescope to obtain measures of emission lines t…
Herschel/HIFI observation of highly excited rotational lines of HNC toward IRC +10 216
Cernicharo, J.; Daniel, F.; Müller, H. S. P. +6 more
We report the detection in emission of various highly excited rotational transitions of HNC (J = 6-5 through J = 12-11) toward the carbon-star envelope IRC +10 216 using the HIFI instrument on-board the Herschel Space Observatory. Observations of the J = 1-0 and J = 3-2 lines of HNC with the IRAM 30-m telescope are also presented. The lines observ…
Herschel/HIFI observations of red supergiants and yellow hypergiants. I. Molecular inventory
Waters, L. B. F. M.; Menten, K. M.; Olofsson, H. +17 more
Context. Red supergiant stars (RSGs) and yellow hypergiant stars (YHGs) are believed to be the high-mass counterparts of stars in the asymptotic giant branch (AGB) and early post-AGB phases. As such, they are scarcer and the properties and evolution of their envelopes are still poorly understood.
Aims: We study the mass-loss in the post main-…
Doppler shift of hot coronal lines in a moss area of an active region
Solanki, S. K.; Teriaca, L.; Wiegelmann, T. +2 more
The moss is the area at the footpoint of the hot (3 to 5 MK) loops forming the core of the active region where emission is believed to result from the heat flux conducted down to the transition region from the hot loops. Studying the variation of Doppler shift as a function of line formation temperatures over the moss area can give clues on the he…
Transiting exoplanets from the CoRoT space mission . XIX. CoRoT-23b: a dense hot Jupiter on an eccentric orbit
Mazeh, T.; Aigrain, S.; Alonso, R. +40 more
We report the detection of CoRoT-23b, a hot Jupiter transiting in front of its host star with a period of 3.6314 ± 0.0001 days. This planet was discovered thanks to photometric data secured with the CoRoT satellite, combined with spectroscopic radial velocity (RV) measurements. A photometric search for possible background eclipsing binaries conduc…
The X-ray warm absorber and nuclear obscuration in the Seyfert 1.8 galaxy ESO 113-G010
Mehdipour, M.; Page, M. J.; Branduardi-Raymont, G.
We present the first analysis of the X-ray warm absorber and nuclear obscuration in the Seyfert 1.8 galaxy
Uncovering the magnetic environment of our solar system
Ben-Jaffel, L.; Ratkiewicz, R.
Since its formation 4.6 billion years ago, our solar system has most likely crossed numerous magnetized interstellar clouds and bubbles of different sizes and contents on its path through the Milky Way. Having a reference model for how the heliosphere and interstellar winds interact is critical for understanding our current Galactic environment, a…
Solar flare hard X-ray spikes observed by RHESSI: a case study
Xu, Y.; Qiu, J.; Cheng, J. X. +2 more
Context. Fast-varying hard X-ray spikes of subsecond time scales were discovered by space telescopes in the 70s and 80s, and are also observed by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI). These events indicate that the flare energy release is fragmented.
Aims: In this paper, we analyze hard X-ray spikes observed by RHESSI to…
Thermal properties of (4) Vesta derived from Herschel measurements
Valtchanov, I.; Fornasier, S.; Leyrat, C. +3 more
Aims: We report in this paper the results provided by new infrared observations of the asteroid (4) Vesta obtained between April 2010 and June 2010 with the Herschel space observatory (ESA) in the wavelength range 70-500 µm when the asteroid was seen from the Northern hemisphere. Over this period, the thermal flux of Vesta was observed …