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FEDReD. III. Unraveling the 3D structure of Vela
Arenou, F.; Babusiaux, C.; Hottier, C.
Context. The Vela complex is a region of the sky that gathers several stellar and interstellar structures in a few hundred square degrees. Aims.Gaia data now allow us to obtain a 3D view of the Vela interstellar structures through the dust extinction.
Methods: We used the FEDReD (Field Extinction-Distance Relation Deconvolver) algorithm on ne…
Populations of super-soft X-ray sources in galaxies of different morphological types
Gilfanov, M.; Galiullin, I.
Aims: We study populations of soft and super-soft X-ray sources (SSSs) in nearby galaxies of various morphological types with particular emphasis on characterizing populations of stable nuclear burning, accreting white dwarfs (WDs).
Methods: Analyzing the content of the Chandra archive, we assembled a sample of nearby galaxies suitable f…
The First Light Curve Solutions and Period Study of BQ Ari
Akyuz, A.; Aksaker, N.; Poro, A. +14 more
The first analysis of the photometric observation in BVR filters of a W UMa type binary system BQ Ari was performed. Light curve analysis was performed using Wilson-Devinney (W-D) code combined with a Monte Carlo (MC) simulation to determine its photometric and geometric elements and their uncertainties. These results show that BQ Ari is a contact…
HADES RV Programme with HARPS-N at TNG. XIII. A sub-Neptune around the M dwarf GJ 720 A
Rebolo, R.; Ribas, I.; Scandariato, G. +21 more
Context. The high number of super-Earth and Earth-like planets in the habitable zone detected around M-dwarf stars in recent years has revealed these stellar objects to be the key to planetary radial velocity (RV) searches.
Aims: Using the HARPS-N spectrograph within The HArps-n red Dwarf Exoplanet Survey (HADES) we have reached the precision…
PSR B0656+14: the unified outlook from the infrared to X-rays
Geier, S.; Mennickent, R. E.; Cabrera-Lavers, A. +4 more
We report detection of PSR B0656+14 with the Gran Telescopio Canarias in narrow optical F657, F754, F802, and F902 and near-infrared JHKs bands. The pulsar detection in the Ks band extends its spectrum to 2.2 $\mu$m and confirms its flux increase towards the infrared. We also present a thorough analysis of the optical spectru…
Probing the Astrometric Properties of Gaia EDR3 Quasars at the Faintest Magnitudes
Liao, Shilong; Qi, Zhaoxiang; Tang, Zhenghong +3 more
Gaia early data release 3 (EDR3) provides about 1.6 million QSO-like objects. Measuring the systematic residuals of the quasars convincingly in Gaia EDR3 is paramount for further fundamental astronomy use. We aim to conduct an independent assessment of the astrometric quality of Gaia EDR3 utilizing a sizable and confirmed extragalactic sources cat…
A confined dynamo: Magnetic activity of the K-dwarf component in the pre-cataclysmic binary system V471 Tauri
Kriskovics, L.; Oláh, K.; Borkovits, T. +6 more
Context. Late-type stars in close binary systems can exhibit strong magnetic activity owing to rapid rotation supported by tidal locking. On the other hand, tidal coupling may suppress the differential rotation which is a key ingredient of the magnetic dynamo.
Aims: We studied the red dwarf component in the eclipsing binary system V471 Tau in…
Maximum helium content of multiple populations in the globular cluster NGC 6752
Martins, F.; Charbonnel, C.; Chantereau, W.
Context. Multiple populations in globular clusters are usually explained by the formation of stars out of material with a chemical composition that is polluted to different degrees by the ejecta of short-lived, massive stars. But the nature of the "polluters" remains elusive. Different types of stars have been proposed to account for the observed …
Central kinematics of the Galactic globular cluster M80
Weilbacher, Peter M.; Kamann, Sebastian; Dreizler, Stefan +7 more
We use spectra observed with the integral-field spectrograph Multi Unit Spectroscopic Explorer (MUSE) to reveal the central kinematics of the Galactic globular cluster Messier 80 (M80, NGC 6093). Using observations obtained with the recently commissioned narrow-field mode of MUSE, we are able to analyse 932 stars in the central 7.5 arcsec by 7.5 a…
Investigating three Sirius-like systems with SPHERE
Rouan, D.; Ménard, F.; Avenhaus, H. +61 more
Context. Sirius-like systems are relatively wide binaries with a separation from a few to hundreds of au; they are composed of a white dwarf (WD) and a companion of a spectral type earlier than M0. Here we consider main sequence (MS) companions, where the WD progenitor evolves in isolation, but its wind during the former asymptotic giant branch (A…