Search Publications
X-ray spectra and light curves of cooling novae and a nova like
Sun, Bangzheng; Orio, Marina; Shugarov, Sergey +3 more
We present X-ray observations of novae V2491 Cyg and KT Eri about 9 yr post-outburst of the dwarf nova and post-nova candidate EY Cyg, and of a VY Scl variable. The first three objects were observed with XMM-Newton, KT Eri also with the Chandra ACIS-S camera, V794 Aql with the Chandra ACIS-S camera and High Energy Transmission Gratings. The two re…
Statistics of solar wind electron breakpoint energies using machine learning techniques
Walsh, A. P.; Rae, I. J.; Smith, A. W. +4 more
Solar wind electron velocity distributions at 1 au consist of a thermal "core" population and two suprathermal populations: "halo" and "strahl". The core and halo are quasi-isotropic, whereas the strahl typically travels radially outwards along the parallel or anti-parallel direction with respect to the interplanetary magnetic field. Using Cluster…
Spectroscopic detection of coronal plasma flows in loops undergoing thermal non-equilibrium cycles
Auchère, Frédéric; Parenti, Susanna; Pelouze, Gabriel +3 more
Context. Long-period intensity pulsations were recently detected in the EUV emission of coronal loops and attributed to cycles of plasma evaporation and condensation driven by thermal non-equilibrium (TNE). Numerical simulations that reproduce this phenomenon also predict the formation of periodic flows of plasma at coronal temperatures along some…
Investigating the Rosetta/RTOF observations of comet 67P/Churyumov-Gerasimenko using a comet nucleus model: influence of dust mantle and trapped CO
Lasue, J.; Altwegg, K.; Garnier, P. +6 more
Context. Cometary outgassing is induced by the sublimation of ices and the ejection of dust originating from the nucleus. Therefore measuring the composition and dynamics of the cometary gas provides information concerning the interior composition of the body. Nevertheless, the bulk composition differs from the coma composition, and numerical mode…
η Carinae: high angular resolution continuum, H30α and He30α ALMA images
Cox, Pierre; Nyman, Lars-Åke; Abraham, Zulema +2 more
We present images of η Carinae in the recombination lines H30α and He30α and the underlying continuum with 50 mas resolution (110 au), obtained with ALMA. For the first time, the 230 GHz continuum image is resolved into a compact core, coincident with the binary system position, and a weaker extended structure to the NW of the compact source. Iso-…
Gas and dust cooling along the major axis of M 33 (HerM33es). Herschel/PACS [C II] and [O I] observations
Boquien, Médéric; van der Werf, Paul; Combes, Françoise +17 more
Context. M 33 is a gas rich spiral galaxy of the Local Group. Its vicinity allows us to study its interstellar medium (ISM) on linear scales corresponding to the sizes of individual giant molecular clouds.
Aims: We investigate the relationship between the two major gas cooling lines and the total infrared (TIR) dust continuum.
Methods: W…
Disc light variability in the FUor star V646 Puppis as observed by TESS and from the ground
Ogłoza, Waldemar; Siwak, Michał; Krzesiński, Jerzy
Context. We investigate small-scale light variations in V646 Pup occurring on timescales of days, weeks, and years.
Aims: We aim to investigate whether this variability is similar to that observed in FU Ori.
Methods: We observed V646 Pup on six occasions at the SAAO and CTIO between 2013 and 2018 with Johnson and Sloan filters, typically…
Asymmetric distributions of H2O and SiO masers towards V627 Cas
Kim, Dong-Jin; Rioja, María J.; Dodson, Richard +7 more
We performed simultaneous observations of the $\rm H_2O$ 61,6 - 52,3 (22.235080 GHz) and SiO V = 1, 2, J = 1 → 0, SiO V = 1, J = 2 → 1, 3 → 2 (43.122080, 42.820587, 86.243442, and 129.363359 GHz) masers towards the suspected D-type symbiotic star, V627 Cas, using the Korean VLBI Network. Here, we present astrometrically regis…
Spectroscopic Monitoring of Rapidly Rotating Early-type Stars in the Pleiades Cluster
Torres, Guillermo
Radial velocities for the early-type stars in the Pleiades cluster have always been challenging to measure because of the significant rotational broadening of the spectral lines. The large scatter in published velocities has led to claims that many are spectroscopic binaries, and in several cases, preliminary orbital solutions have been proposed. …
Distortion of Magnetic Fields in the Dense Core CB81 (L1774, Pipe 42) in the Pipe Nebula
Kwon, Jungmi; Nagata, Tetsuya; Tamura, Motohide +9 more
The detailed magnetic field structure of the starless dense core CB81 (L1774, Pipe 42) in the Pipe Nebula was determined based on near-infrared polarimetric observations of background stars to measure dichroically polarized light produced by magnetically aligned dust grains in the core. The magnetic fields pervading CB81 were mapped using 147 star…