Search Publications
Carina High-contrast Imaging Project for massive Stars (CHIPS). II. O stars in Trumpler 14
Absil, O.; Sana, H.; Bodensteiner, J. +2 more
Context. Most massive stars belong to multiple systems, yet the formation process leading to such high multiplicity remains insufficiently understood. To help constrain the different formation scenarios that exist, insights into the low-mass end of the companion mass function of such stars is crucial. However, this is a challenging endeavour as (s…
Investigating dust properties in AGB wind-ISM interaction regions
De Beck, E.; Mecina, M.; Maercker, M. +1 more
Aims: In this paper, we aim to constrain the dust mass and grain sizes in the interaction regions between the stellar winds and the interstellar medium (ISM) around asymptotic giant branch (AGB) stars. By describing the dust in these regions, we aim to shed light on the role of evolved low-mass stars in the origin of dust in galaxies.
Me…
Discovery of four super-soft X-ray sources in XMM-Newton observations of the Large Magellanic Cloud
Haberl, F.; Maitra, C.
Context. Super-soft X-ray sources were established as a heterogeneous class of objects from observations of the Large Magellanic Cloud (LMC).
Aims: We have searched for new sources of this class in the X-ray images obtained from the XMM-Newton survey of the LMC and additional archival observations.
Methods: We first selected candidates b…
Discovery of new TESS pulsating hot subdwarfs
Balona, L. A.; Krzesinski, J.
Aims: This work is dedicated to a search for new pulsating hot subdwarfs in TESS photometric data which could have been missed in previous searches.
Methods: By matching catalogues of hot subdwarfs with TESS targets and using luminosities from Gaìa parallaxes, a list of 1389 candidate hot subdwarfs observed by TESS was created. The perio…
Analytical determination of orbital elements using Fourier analysis. II. Gaia astrometry and its combination with radial velocities
Ségransan, D.; Delisle, J. -B.
The ESA global astrometry space mission Gaia has been monitoring the position of a billion stars since 2014. The analysis of such a massive dataset is challenging in terms of the data processing involved. In particular, the blind detection and characterization of single or multiple companions to stars (planets, brown dwarfs, or stars) using Gaia a…
An analysis of the most distant cataloged open clusters. Re-assessing fundamental parameters with Gaia EDR3 and ASteCA
Perren, G. I.; Pera, M. S.; Navone, H. D. +1 more
Context. Several studies have been presented in the last few years applying some kind of automatic processing of data to estimate the fundamental parameters of open clusters. These parameters are then employed in larger scale analyses, for example the structure of the Galaxy's spiral arms. The distance is one of the most straightforward parameters…
disnht: Modeling X-ray absorption from distributed column densities
Bianchi, Stefano; Ponti, Gabriele; Locatelli, Nicola
Collecting and analyzing X-ray photons over either spatial or temporal scales encompassing varying optical depth values requires knowledge about the optical depth distribution. For a sufficiently broad optical depth distribution, assuming a single column density value leads to a misleading interpretation of the source emission properties, nominall…
Important stellar perturbers found during the StePPeD database update based on Gaia EDR3 data
Dybczyński, Piotr A.; Berski, Filip; Tokarek, Jakub +3 more
Context. In 2020, the initial version of the Stellar Potential Perturbers Database (StePPeD) was presented with the aim to deliver up-to-date information on the stars and stellar systems that may perturb a long-period comet motion. We used the minimal distance between a star and the Sun as a selecting tool when compiling a list of interesting obje…
Extra-tidal star candidates in globular clusters of the Sagittarius dwarf spheroidal galaxy
Carballo-Bello, Julio A.; Minniti, Dante; Fernández-Trincado, José G. +4 more
Context. Globular clusters (GCs) associated with the Sagittarius dwarf spheroidal galaxy (Sgr dSph) have evolved under the gravitational potential of both Sgr dSph and the Milky Way. The effects of these potentials are most pronounced in the extra-tidal regions as compared to the central regions of the GCs.
Aims: We aim to study the extra-tid…
Radio emission in a nearby, ultra-cool dwarf binary: A multifrequency study
Rebolo, R.; Béjar, V. J. S.; Zapatero Osorio, M. R. +8 more
Context. The substellar triple system VHS J125601.92−125723.9 (hereafter VHS 1256−1257) is composed of an equal-mass M7.5 brown dwarf binary and an L7 low-mass substellar object. In Guirado et al. (2018, A&A, 610, A23) we published the detection of radio emission at 8.4 GHz coming from the central binary and making it an excellent target for f…