Search Publications
Circumstellar envelopes of semi-regular long-period variables: mass-loss rate estimates and general model fitting of the molecular gas
Alcolea, J.; Santander-García, M.; Bujarrabal, V. +4 more
Aims: We aim to study the main properties of a volume-limited unbiased sample of well-characterized semi-regular variables (SRs) in order to clarify important issues that need to be further explained, such as the formation of axially symmetric planetary nebulae (PNe) from spherical circumstellar envelopes (CSEs), which takes place during the …
Search for water outgassing of (1) Ceres near perihelion
Russell, C. T.; Mousis, O.; Vernazza, P. +13 more
Context. (1) Ceres is the largest body in the main asteroid belt and one of the most intriguing objects in the solar system, in part because of the discovery of water outgassing by the Herschel Space Observatory (HSO) and its still-debated origin. Ceres was the target of NASA's Dawn spacecraft for 3.5 yr, which achieved a detailed characterization…
ATLASGAL-selected massive clumps in the inner Galaxy. VII. Characterisation of mid-J CO emission
König, C.; Menten, K. M.; Csengeri, T. +7 more
Context. High-mass stars are formed within massive molecular clumps, where a large number of stars form close together. The evolution of the clumps with different masses and luminosities is mainly regulated by their high-mass stellar content and the formation of such objects is still not well understood.
Aims: In this work, we characterise th…
Nature of blackbody stars
Serenelli, Aldo; Rohrmann, René D.; Fukugita, Masataka
A selection of 17 stars in the Sloan Digital Sky Survey, previously identified as DC-class white dwarfs (WDs), has been reported to show spectra very close to blackbody radiation in the wavelength range from ultraviolet to infrared. Because of the absence of lines and other details in their spectra, the surface gravity of these objects has previou…
ISPY - NaCo Imaging Survey for Planets around Young stars. A young companion candidate embedded in the R CrA cloud
Quanz, S. P.; Quirrenbach, A.; Henning, T. +13 more
Context. Within the NaCo-ISPY exoplanet imaging program, we aim at detecting and characterizing the population of low-mass companions at wide separations (≳10 AU), focusing in particular on young stars either hosting a known protoplanetary disk or a debris disk.
Aims: R CrA is one of the youngest (1-3 Myr) and most promising objects in our sa…
Accretion disc by Roche lobe overflow in the supergiant fast X-ray transient IGR J08408-4503
Santangelo, A.; Ducci, L.; Romano, P. +1 more
Supergiant fast X-ray transients (SFXTs) are X-ray binary systems with a supergiant companion and likely a neutron star, which show a fast (∼103 s) and high variability with a dynamic range up to 105-6. Given their extreme properties, they are considered among the most valuable laboratories to test accretion models. Recently,…
Probing the initial conditions of high-mass star formation. III. Fragmentation and triggered star formation
Zhang, Chuan-Peng; Li, Guang-Xing; Wyrowski, Friedrich +6 more
Context. Fragmentation and feedback are two important processes during the early phases of star formation.
Aims: Massive clumps tend to fragment into clusters of cores and condensations, some of which form high-mass stars. In this work, we study the structure of massive clumps at different scales, analyze the fragmentation process, and invest…
Herschel-HOBYS study of the earliest phases of high-mass star formation in NGC 6357
White, G. J.; Könyves, V.; Rygl, K. L. J. +19 more
Aims: To constrain models of high-mass star formation it is important to identify the massive dense cores (MDCs) that are able to form high-mass star(s). This is one of the purposes of the Herschel/HOBYS key programme. Here, we carry out the census and characterise of the properties of the MDCs population of the NGC 6357 H II region.
Met…
The optical and NIR spectrum of the Crab pulsar with X-shooter
Sollerman, J.; Lundqvist, P.; Vreeswijk, P. M. +2 more
Context. Pulsars are well studied all over the electromagnetic spectrum, and the Crab pulsar may be the most studied object in the sky. Nevertheless, a high-quality optical to near-infrared (NIR) spectrum of the Crab or any other pulsar has not been published to date.
Aims: Obtaining a properly flux-calibrated spectrum enables us to measure t…
Constraints on HD 113337 fundamental parameters and planetary system. Combining long-base visible interferometry, disc imaging, and high-contrast imaging
Henning, T.; Meunier, N.; Lagrange, A. -M. +14 more
Context. HD 113337 is a main-sequence F6V field star more massive than the Sun. This star hosts one confirmed giant planet and possibly a second candidate, detected by radial velocities (RVs). The star also hosts a cold debris disc detected through the presence of an infrared excess, making it an interesting system to explore.
Aims: We aim to…