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An XMM-Newton Early-type Galaxy Atlas
Trinchieri, Ginevra; Lauer, Jennifer; Fabbiano, Giuseppina +9 more
The distribution of hot interstellar medium in early-type galaxies (ETGs) bears the imprint of the various astrophysical processes it underwent during its evolution. The X-ray observations of these galaxies have identified various structural features related to active galactic nucleus (AGN) and stellar feedback and environmental effects such as me…
[CII] emission properties of the massive star-forming region RCW 36 in a filamentary molecular cloud
Oyabu, S.; Nakagawa, T.; Ojha, D. K. +10 more
Aims: We investigate the properties of [C II] 158 µm emission of RCW 36 in a dense filamentary cloud.
Methods: [C II] observations of RCW 36, covering an area of ~30' × 30', were carried out with a Fabry-Pérot spectrometer on board a 100-cm balloon-borne far-infrared (IR) telescope with an angular resolution of 90''. Using AKARI an…
A meeting at z ∼ 3: Young massive galaxies and an AGN within 30 kpc of the luminous QSO LBQS 0302-0019
Sander, A. A. C.; Shanks, T.; Husemann, B. +2 more
Context. Contrary to expectations from scenarios of black hole growth driven by galaxy interactions and mergers, dual active galactic nuclei (AGN) with kiloparsec separations are rarely observed and are very difficult to identify, in particular at high redshifts (i.e. z > 2).
Aims: Focussing on the recently discovered dual AGN system LBQS …
Physical modelling of the circumstellar material in the early-type active binary HH Carinae
Bakış, V.; Eker, Z.; Nitschelm, C. +2 more
High-resolution spectra ( $R\sim 48\, 000$ ) of the massive binary system HH Carinae have been analysed. Precise absolute parameters were derived from a simultaneous solution of the radial velocities and the light curves. The primary component is found to be an O9-type main-sequence star with a temperature of 33 500 K, while the secondary componen…
Combining Astrometry and Elemental Abundances: The Case of the Candidate Pre-Gaia Halo Moving Groups G03-37, G18-39, and G21-22
Agüeros, Marcel A.; Schuler, Simon C.; Andrews, Jeff J. +3 more
While most moving groups are young and nearby, a small number have been identified in the Galactic halo. Understanding the origin and evolution of these groups is an important piece of reconstructing the formation history of the halo. Here we report on our analysis of three putative halo moving groups: G03-37, G18-39, and G21-22. Based on Gaia EDR…
LIStEN: L' band Imaging Survey for Exoplanets in the North
Henning, Thomas; Ertel, Steve; Musso Barcucci, Arianna +9 more
Context. Planetary systems and debris discs are natural by-products of the star formation process, and they affect each other. The direct imaging technique allows simultaneous imaging of both a companion and the circumstellar disc it resides in, and is thus a valuable tool to study companion-disc interactions. However, the number of systems in whi…
Stellar and Accretion Disk Parameters of the Close Binary HD 50526
Mennickent, R. E.; Zharikov, S.; Djurašević, G. +5 more
We present a photometric and spectroscopic study of HD 50526, an ellipsoidal binary member of the group Double Periodic Variable stars. Performing data mining in photometric surveys and conducting new spectroscopic observations with several spectrographs during 2008-2015, we obtained orbital and stellar parameters of the system. The radial velocit…
Heavy-element Rydberg transition line emission from the post-giant-evolution star HD 101584
Lindqvist, M.; Olofsson, H.; Black, J. H. +7 more
Context. We report the detection of two lines at millimetre wavelengths towards the immediate surroundings of the post-giant and most likely post-common-envelope star HD 101584 using high-angular-resolution ALMA observations. The circumstellar environment of this object is rich in different molecular species, but we find no viable identifications …
The First Radio Spectrum of a Rapidly Rotating A-type Star
De la Luz, V.; Moór, A.; Fehér, O. +9 more
The radio spectra of main-sequence stars remain largely unconstrained due to the lack of observational data to inform stellar atmosphere models. As such, the dominant emission mechanisms at long wavelengths, how they vary with spectral type, and how much they contribute to the expected brightness at a given radio wavelength are still relatively un…
Investigation of the shortest period Am type eclipsing binary TYC 6408-989-1
Tian, Xiao-Man
The first BV bands photometric observations and the low-resolution spectrum of the shortest period Am type eclipsing binary TYC 6408-989-1 have been obtained. The stellar atmospheric parameters of the primary star were obtained through the spectral fitting as follows: Teff = 6990 ± 117 K, log g = 4.25 ± 0.26 cm s-2, [Fe/H] = …