Search Publications
ArTéMiS imaging of the filamentary infrared dark clouds G1.75-0.08 and G11.36+0.80: Dust-based physical properties of the clouds and their clumps
André, Ph.; Miettinen, O.; Mattern, M.
Context. Filamentary infrared dark clouds (IRDCs) are a useful class of interstellar clouds for studying the cloud fragmentation mechanisms on different spatial scales. Determination of the physical properties of the substructures in IRDCs can also provide useful constraints on the initial conditions and early stages of star formation, including t…
Near-IR narrow-band imaging with CIRCE at the Gran Telescopio Canarias: Searching for Lyα-emitters at z ∼ 9.3
Mas-Hesse, J. M.; Herrero, A.; Marín-Franch, A. +8 more
Context. Identifying very high-redshift galaxies is crucial for understanding the formation and evolution of galaxies. However, many questions still remain, and the uncertainty on the epoch of reionization is large. In this approach, some models allow a double-reionization scenario, although the number of confirmed detections at very high z is sti…
The symbiotic binary St 2-22: Orbital and stellar parameters and jet evolution following its 2019 outburst
Mikołajewska, J.; Iłkiewicz, K.; Monard, B. +3 more
Context. St 2-22 is a relatively poorly studied S-type symbiotic system that belongs to a small group of jet-producing systems as a result of disc accretion onto a white dwarf fed by its red giant companion.
Aims: The goal of this paper is to analyse the nature and derive the basic parameters of St 2-22, and to follow the jet evolution.
…
K2 discovery of a circumsecondary disk transiting EPIC 220208795
Mamajek, E. E.; Kenworthy, M. A.; Pojmański, G. +2 more
Context. Observations of the star EPIC 220208795 (2MASS J01105556+0018507) reveal a single, deep and asymmetric eclipse, which we hypothesise is due to an eclipsing companion surrounded by a tilted and inclined opaque disk, similar to those seen around V928 Tau and EPIC 204376071.
Aims: We aim to derive physical parameters of the disk and orb…
Extended population associated with W40
Comerón, F.; Schneider, N.; Djupvik, A. A.
Context. W40 is a heavily obscured bipolar HII region projected in the direction of the Aquila Rift and ionized by hot stars in a central, partly embedded cluster. The study of the cluster and its surroundings has been greatly hampered thus far by the strong extinction in the region.
Aims: Our aim is to improve the characterization of the W40…
Abundances of disk and bulge giants from high-resolution optical spectra. V. Molybdenum: The p-process element
Ryde, N.; Rich, R. M.; Jönsson, H. +2 more
Aims: In this work, we aim to make a differential comparison of the neutron-capture and p-process element molybdenum (Mo) in the stellar populations in the local disk(s) and the bulge, focusing on minimising possible systematic effects in the analysis.
Methods: The stellar sample consists of 45 bulge and 291 local disk K-giants observed …
A census of young stellar objects in two line-of-sight star-forming regions toward IRAS 22147+5948 in the outer Galaxy
Szczerba, Ryszard; Elia, Davide; Fischer, William J. +9 more
Context. Star formation in the outer Galaxy, namely, outside of the Solar circle, has not been extensively studied in part due to the low CO brightness of the molecular clouds linked with the negative metallicity gradient. Recent infrared surveys provide an overview of dust emission in large sections of the Galaxy, but they suffer from cloud confu…
Prominence instability and CMEs triggered by massive coronal rain in the solar atmosphere
Hanslmeier, A.; Gömöry, P.; Zaqarashvili, T. V. +3 more
Context. The triggering process for prominence instability and consequent coronal mass ejections (CMEs) is not fully understood. Prominences are maintained by the Lorentz force against the gravity; therefore, reduction of the prominence mass due to the coronal rain may cause the change of the force balance and hence destabilisation of the structur…
Magnetic fields and hot gas in M 101
Ehle, M.; Weżgowiec, M.; Soida, M. +4 more
Context. Studies of nearby spiral galaxies in radio and X-ray wavelengths reveal the structure and energy balance of the magnetic fields and the hot interstellar medium (ISM). In some spiral galaxies, large-scale ordered magnetic fields have been found between the spiral stellar arms (the so-called magnetic arms). One of the considered explanation…
Contribution of flows around active regions to the north-south helioseismic travel-time measurements
Gizon, L.; Poulier, P. -L.; Liang, Z. -C. +1 more
Context. In local helioseismology, the travel times of acoustic waves propagating in opposite directions along the same meridian inform us about horizontal flows in the north-south direction. The longitudinal averages of the north-south helioseismic travel-time shifts vary with the sunspot cycle.
Aims: We aim to study the contribution of infl…