Search Publications
The influence of Hinode/SOT NFI instrumental effects on the visibility of simulated prominence fine structures in Hα
Gunár, S.; Ichimoto, K.; Jurčák, J.
Context. Models of entire prominences with their numerous fine structures distributed within the prominence magnetic field use approximate radiative transfer techniques to visualize the simulated prominences. However, to accurately compare synthetic images of prominences obtained in this way with observations and to precisely analyze the visibilit…
Star clusters in the dwarf irregular galaxy Leo A
Vansevičius, V.; Stonkutė, R.; Čeponis, M. +2 more
Context. Leo A is an isolated gas-rich dwarf irregular galaxy of low stellar mass and metallicity residing at the outskirts of the Local Group. Ages of the stellar populations in Leo A range from ∼10 Myr to ∼10 Gyr. So far, only one star cluster has been discovered in this galaxy.
Aims: Our aim is to search for star cluster candidates in the …
Follow-up observations of X-ray emitting hot subdwarf stars: the compact He-poor sdO star Feige 34
Tiengo, A.; Mereghetti, S.; Esposito, P. +1 more
We report on results obtained with the XMM-Newton observation of Feige 34 carried out in April 2018. This is the first spectroscopic X-ray observation of a compact and helium-poor hot subdwarf star. The source was detected at a flux level fX = 3.4 × 10-14 erg cm-2 s-1 in the energy range 0.2-3 keV, which…
Phase-curve analysis of comet 67P/Churyumov-Gerasimenko at small phase angles
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +31 more
Aims: The Rosetta-OSIRIS images acquired at small phase angles in three wavelengths during the fly-by of the spacecraft on 9-10 April 2016 provided a unique opportunity to study the opposition effect on the surface of comet 67P/Churyumov-Gerasimenko (67P). Our goal is to study phase curves of the nucleus at small phase angles for a variety of…
3C 294 revisited: Deep Large Binocular Telescope AO NIR images and optical spectroscopy
Quirrenbach, A.; Gredel, R.; Thompson, D. +11 more
Context. High redshift radio galaxies are among the most massive galaxies at their redshift, are often found at the center of protoclusters of galaxies, and are expected to evolve into the present day massive central cluster galaxies. Thus they are a useful tool to explore structure formation in the young Universe.
Aims:
A multi-molecular line study of the star-forming globule CB88-230
Codella, C.; Giannetti, A.; Massi, F. +2 more
Context. This paper relates to low-mass star formation in globules, and the interaction of newly-formed stars with their environment. We follow up on the results of our earlier observations of this globule.
Aims: Our aim is to study the gas- and dust environment of the young stellar object (YSO) in globule CB88 230, the large-scale molecular …
Astrometric planet search around southern ultracool dwarfs. IV. Relative motion of the FORS2/VLT CCD chips
Sahlmann, J.; Lazorenko, P. F.
We present an investigation of the stability of the two chips in the FORS2 camera CCD mosaic on the basis of astrometric observations of stars in 20 sky fields, some of which were monitored for four to seven years. We detected a smooth relative shear motion of the chips along their dividing line that is well approximated by a cubic function of tim…
Cloud G074.11+00.11: a stellar cluster in formation
Kim, Kee-Tae; Liu, Sheng-Yuan; Zhang, Qizhou +9 more
Context. We present molecular line and dust continuum observations of a Planck-detected cold cloud, G074.11+00.11. The cloud consists of a system of curved filaments and a central star-forming clump. The clump is associated with several infrared sources and H2O maser emission.
Aims: We aim to determine the mass distribution and gas…
XMM-Newton and Fermi/LAT view on the supernova remnant 3C434.1
Santangelo, A.; Pühlhofer, G.; Sasaki, M. +3 more
We report on XMM-Newton observations of the supernova remnant (SNR) 3C434.1 (G94.0+1.0), the first in X-rays since the ROSAT era. Our analysis confirms the thermal origin of the observed extended X-ray emission, whose morphology appears more complex than previously reported. In particular, part of the shell shows a significantly harder spectrum wh…
Silicate features in the circumstellar envelopes of the Class I binary driving source of HH 250
Comerón, F.; Merín, B.; Reipurth, B. +1 more
Context. The silicate feature near 10 µm is one of the main tools available to study the mineralogy of circumstellar disks and envelopes, providing information on the thermal processing, growth, location, and circulation of dust grains.
Aims: We investigate the silicate feature of the two Class I components of HH 250-IRS, a resolved bin…