Search Publications
Burst-induced coronal cooling in GS 1826-24. The clock wagging its tail
Sánchez-Fernández, C.; Kuulkers, E.; Poutanen, J. +2 more
Type I X-ray bursts in GS 1826-24, and in several other systems, may induce cooling of the hot inner accretion flow that surrounds the bursting neutron star. Given that GS 1826-24 remained persistently in the hard state over the period 2003-2008 and presented regular bursting properties, we stacked the spectra of the X-ray bursts detected by INTEG…
Discovery of technetium- and niobium-rich S stars: The case for bitrinsic stars
Jorissen, A.; Escorza, A.; Van Winckel, H. +4 more
Context. S stars are late-type giants with overabundances of s-process elements. They come in two flavors depending on the presence or lack of presence of technetium (Tc), an element without stable isotopes. Intrinsic S stars are Tc-rich and genuine asymptotic giant branch (AGB) stars, while extrinsic S stars owe their s-process over abundances to…
High-resolution observations of the solar photosphere, chromosphere, and transition region. A database of coordinated IRIS and SST observations
Gošić, M.; De Pontieu, B.; Sainz Dalda, A. +30 more
NASA's Interface Region Imaging Spectrograph (IRIS) provides high-resolution observations of the solar atmosphere through ultraviolet spectroscopy and imaging. Since the launch of IRIS in June 2013, we have conducted systematic observation campaigns in coordination with the Swedish 1 m Solar Telescope (SST) on La Palma. The SST provides complement…
The great Kite in the sky: A LOFAR observation of the radio source in Abell 2626
Di Gennaro, G.; Brunetti, G.; Hardcastle, M. J. +15 more
Context. The radio source at the center of the galaxy cluster Abell 2626, also known as the Kite, stands out for its unique morphology composed of four symmetric arcs. Previous studies have probed the properties of this source at different frequencies and its interplay with the surrounding thermal plasma, but the puzzle of its origin is still unso…
Deciphering the radio star formation correlation on kpc scales. I. Adaptive kernel smoothing experiments
Soida, M.; Beck, R.; Vollmer, B. +1 more
One of the tightest correlations in astronomy is the relation between the integrated radio continuum and the far-infrared (FIR) emission. Within nearby galaxies, variations in the radio-FIR correlation have been observed, mainly because the cosmic ray electrons migrate before they lose their energy via synchrotron emission or escape. The major cos…
The VMC Survey. XXXVII. Pulsation periods of dust-enshrouded AGB stars in the Magellanic Clouds
van Loon, J. Th.; Ripepi, V.; Marconi, M. +9 more
Context. Variability is a key property of stars on the asymptotic giant branch (AGB). Their pulsation period is related to the luminosity and mass-loss rate of the star. Long-period variables (LPVs) and Mira variables are the most prominent of all types of variability of evolved stars. The reddest, most obscured AGB stars are too faint in the opti…
Scaling relations and baryonic cycling in local star-forming galaxies. I. The sample
Hunt, L. K.; Ginolfi, M.; Schneider, R. +2 more
Metallicity and gas content are intimately related in the baryonic exchange cycle of galaxies, and galaxy evolution scenarios can be constrained by quantifying this relation. To this end, we have compiled a sample of ∼400 galaxies in the local Universe, dubbed "MAGMA" (Metallicity And Gas for Mass Assembly), which covers an unprecedented range in …
Spectroscopy and polarimetry of the gravitationally lensed quasar SDSS J1004+4112 with the 6m SAO RAS telescope
Popović, L. Č.; Afanasiev, V. L.; Fian, C. +5 more
Context. We present new spectroscopic and polarimetric observations of the gravitational lens SDSS J1004+4112 taken with the 6 m telescope of the Special Astrophysical Observatory (Russia).
Aims: In order to explain the variability that is observed only in the blue wing of the C IV emission line, corresponding to image A, we analyze the spect…
The GAPS Programme at TNG. XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
Baratella, M.; Mallonn, M.; Scandariato, G. +20 more
Context. The detailed chemical composition of stars is important in many astrophysical fields, among which is the characterisation of exoplanetary systems. Previous studies seem to indicate an anomalous chemical pattern of the youngest stellar population in the solar vicinity that has sub-solar metal content. This can influence various observation…
Gaia-DR2 extended kinematical maps. III. Rotation curves analysis, dark matter, and MOND tests
Wang, H. -F.; López-Corredoira, M.; Chrobáková, Ž. +2 more
Context. Recent statistical deconvolution methods have produced extended kinematical maps in a range of heliocentric distances that are a factor of two to three larger than those analysed in Gaia Collaboration (2018, A&A, 616, A11) based on the same data.
Aims: In this paper, we use such maps to derive the rotation curve both in the Galac…