Search Publications
The TOPGöt high-mass star-forming sample. I. Methyl cyanide emission as tracer of early phases of star formation
Immer, K.; Testi, L.; Elia, D. +9 more
Aims: The TOPGöt project studies a sample of 86 high-mass star-forming regions in different evolutionary stages from starless cores to ultra compact HII regions. The aim of the survey is to analyze different molecular species in a statistically significant sample to study the chemical evolution in high-mass star-forming regions, and identify …
Outflows from GRB hosts are ubiquitous: Kinematics of z < 0.3 GRB-SN hosts resolved with FLAMES
Covino, S.; Della Valle, M.; Melandri, A. +12 more
The hosts of long duration gamma-ray bursts (GRBs) are predominantly starburst galaxies at subsolar metallicity. At redshifts z < 1, this implies that most of them are low-mass galaxies similar to the populations of blue compact dwarfs and dwarf irregulars. What triggers the massive star-formation needed for producing a GRB progenitor is still …
Properties of the Hyades, the eclipsing binary HD 27130, and the oscillating red giant ɛ Tauri
Snellen, I. A. G.; Grundahl, F.; Fredslund Andersen, M. +21 more
Context. The derivation of accurate and precise masses and radii is possible for eclipsing binary stars, allowing for insights into their evolution. When residing in star clusters, they provide measurements of even greater precision, along with additional information on their properties. Asteroseismic investigations of solar-like oscillations offe…
Pebbles in an embedded protostellar disk: the case of CB 26
Henning, Thomas; Zhang, Chuan-Peng; Launhardt, Ralf +2 more
Context. Planetary cores are thought to form in proto-planetary disks via the growth of dusty solid material. However, it is unclear how early this process begins.
Aims: We study the physical structure and grain growth in the edge-on disk that surrounds the ≈1 Myr old low-mass (≈0.55 M⊙) protostar embedded in the Bok globule CB26 t…
Probing galactic double-mode RR Lyrae stars against Gaia EDR3
Kovacs, Geza; Karamiqucham, Behrooz
Context. Classical double-mode pulsators (RR Lyrae stars and δ Cepheids) are important because of their simultaneous pulsation in low-order radial modes. This enables us to place stringent constraints on their physical parameters.
Aims: We use 30 bright galactic double-mode RR Lyrae (RRd) stars to estimate their luminosities and compare these…
Solar Orbiter's first Venus flyby. MAG observations of structures and waves associated with the induced Venusian magnetosphere
Maksimovic, M.; Bale, S. D.; Horbury, T. S. +18 more
Context. The induced magnetosphere of Venus is caused by the interaction of the solar wind and embedded interplanetary magnetic field with the exosphere and ionosphere of Venus. Solar Orbiter entered Venus's magnetotail far downstream, > 70 Venus radii, of the planet and exited the magnetosphere over the north pole. This offered a unique view o…
Quiet-time low energy ion spectra observed on Solar Orbiter during solar minimum
Kulkarni, S. R.; Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F. +32 more
Context. The Solar Orbiter spacecraft cruised in the inner heliosphere during Feb. 2020 - Jan. 2021, moving between ∼0.5-1.0 au radial distance. The Energetic Particle Detector suite operated continuously during this period.
Aims: The Suprathermal Ion Spectrograph and High Energy Telescope observations made during intervals in between transie…
A discontinuity in the luminosity-mass relation and fluctuations in the evolutionary tracks of low-mass and low-metallicity stars at the Gaia M-dwarf gap
Kroupa, Pavel; Mansfield, Santana
Context. The Gaia M-dwarf gap is a recently discovered feature in the colour-magnitude diagram that shows a deficiency of low-mass and low-metallicity stars at the lower end of the main sequence.
Aims: We aim at performing theoretical stellar modelling at low metallicities using a fine mass step and a fine time step, looking specifically for …
DEATHSTAR: nearby AGB stars with the Atacama Compact Array. II. CO envelope sizes and asymmetries: the S-type stars
Lindqvist, M.; Olofsson, H.; Sahai, R. +13 more
Aims: We aim to constrain the sizes of, and investigate deviations from spherical symmetry in, the CO circumstellar envelopes (CSEs) of 16 S-type stars, along with an additional 7 and 4 CSEs of C-type and M-type AGB stars, respectively.
Methods: We map the emission from the CO J = 2-1 and 3-2 lines observed with the Atacama Compact Array…
Detection of new O-type stars in the obscured stellar cluster Tr 16-SE in the Carina Nebula with KMOS
Preibisch, T.; Roccatagliata, V.; Ercolano, B. +2 more
Context. The Carina Nebula harbors a large population of high-mass stars, including at least 75 O-type and Wolf-Rayet (WR) stars, but the current census is not complete since further high-mass stars may be hidden in or behind the dense dark clouds that pervade the association.
Aims: With the aim of identifying optically obscured O- and early …