The spatial extent of polycyclic aromatic hydrocarbons emission in the Herbig star HD 179218
Aim. We investigate, in the mid-infrared, the spatial properties of the polycyclic aromatic hydrocarbons (PAHs) emission in the disk of HD 179218, an...
The spatially resolved broad line region of IRAS 09149-6206
We present new near-infrared VLTI/GRAVITY interferometric spectra that spatially resolve the broad Brγ emission line in the nucleus of the active galaxy IRAS...
The spectral index-flux density relation for extragalactic radio sources selected at metre and decametre wavelengths
We use the recent releases of sensitive VLA/LOFAR large-area surveys at 340 MHz and 54 MHz, in conjunction with the 1.4 GHz NVSS, to accurately determine the...
The spectral type of CHS 7797 - an intriguing very low mass periodic variable in the Orion Nebula Cluster
Aims: We present the spectroscopic characterization of the unusual high-amplitude very low mass pre-main-sequence periodic variable CHS 7797. Methods: This...
The spectral variability of the cool hypergiant rho Cassiopeiae
We checked the change of the effective temperature with the atmospherical pulsation of rho Cas from combined analyses of optical spectra of 1993-95 and IUE...
The spectroscopic evolution of the recurrent nova T Pyxidis during its 2011 outburst (Corrigendum). I. The optically thick phase and the origin of moving lines in novae
We correct the velocities quoted for interstellar absorption features from Shore et al. (2011), A&A, 533, L8.
The spectroscopic evolution of the recurrent nova T Pyxidis during its 2011 outburst. I. The optically thick phase and the origin of moving lines in novae
Aims: We aim to derive the physical properties of the recurrent nova T Pyx and the structure of the ejecta during the early stages of expansion of the 2011...
The spectroscopic Hertzsprung-Russell diagram of Galactic massive stars
The distribution of stars in the Hertzsprung-Russell diagram narrates their evolutionary history and directly assesses their properties. Placing stars in this...