Search Publications
Identifying Ae/Be stars in Gaia low-resolution BP/RP spectra
Paunzen, E.; Prišegen, M.; Bernhard, K. +2 more
Classical Be, and Herbig Ae/Be stars are mainly characterized by emission in the Hα and Hβ lines. These lines are essential to understanding the formation of massive stars and describing mass loss and stellar winds during stellar evolution. This study aims to characterize and detect classical Be and Herbig Ae/Be stars in Gaia BP/RP spectra, which …
Spectral evolution of hot hybrid white dwarfs: I. Spectral analysis
Rauch, Thomas; Werner, Klaus; Reindl, Nicole +1 more
Context. Hydrogen-rich white dwarfs (WDs) comprise the majority of the WD population, but are only rarely found at the very hot end of the WD cooling sequence. A small subgroup that exhibits both hydrogen and helium lines in their spectra, the so-called hybrid (or DAO) WDs, represents the majority of hydrogen-rich WDs at effective temperatures T
A Luminous X-Ray Active Galactic Nucleus in the Dwarf–Dwarf Galaxy Merger RGG 66
Reines, Amy E.; Kimbrell, Seth J.
We present the discovery of a luminous X-ray active galactic nucleus (AGN) in the dwarf galaxy merger RGG 66. The black hole is predicted to have a mass of M BH ∼ 105.4 M ⊙ and to be radiating close to its Eddington limit (L bol/L Edd ∼ 0.75). The AGN in RGG 66 is notable both for its presence…
Wide-binary eccentricity distribution in young star clusters: dependence on the binary separation and mass
Federrath, Christoph; Hu, Yue; Xu, Siyao +2 more
We study the wide-binary eccentricity (e) distribution in young star clusters and the role of turbulence in setting the form of the e distribution using magnetohydrodynamical simulations of star cluster formation. The simulations incorporate gravity, turbulence, magnetic fields, protostellar heating, and jets/outflows. We find that (1) simulations…
Discovery of diffuse radio source in Abell 1060
Nakazawa, Kazuhiro; Akahori, Takuya; Kurahara, Kohei +2 more
Non-thermal components in the intra-cluster medium (ICM), such as turbulence, magnetic field, and cosmic rays, imprint the past and current energetic activities of jets from active galactic nuclei (AGN) of member galaxies as well as disturbance caused by galaxy cluster mergers. Meter- and centimeter-radio observations of synchrotron radiation allo…
Fundamental Parameters of a Binary System Consisting of a Red Dwarf and a Compact Star
Ding, Xu; Ji, KaiFan; Song, ZhiMing +7 more
TIC 157365951 has been classified as a δ Scuti type by the International Variable Star Index. Through the spectra from Large Sky Area Multi-Object Fiber Spectroscopic Telescope and its light curve, we further discovered that it is a binary system. This binary system comprises a red-dwarf star and a compact star. Through the spectral energy distrib…
Determinación de parámetros astrofísicos de cúmulos abiertos a partir de fotometría de GAIA
Simondi-Romero, F. O.; Ahumada, A. V.; Callen, A. R. +5 more
As a continuation of a project within the framework of the General Astrophysics subject (FaMAF, UNC), astrophysical parameters of 4 open clusters of the Milky Way are presented. Based on Gaia DR3 photometric data and fitting theoretical isochrones in the color-magnitude diagrams $(G_{BP}-G_{RP}, G)$, ages, metallicities, distances and color excess…
Improved source classification and performance analysis using Gaia DR3
Bailer-Jones, Coryn A. L.; Jamal, Sara
The Discrete Source Classifier (DSC) provides probabilistic classification of sources in Gaia Data Release 3 (GDR3) using a Bayesian framework and a global prior. The DSC Combmod classifier in GDR3 achieved for the extragalactic classes (quasars and galaxies) a high completeness of 92%, but a low purity of 22% (all sky, all magnitudes) due to cont…
A Wave-corrected Assessment of the Local Midplane
Hinkel, Austin; Yin, Ziyuan
As the number of known Galactic structures mounts thanks to the Gaia Space Telescope, it is now pertinent to study methods for disentangling structures occupying the same regions of the Milky Way. Indeed, understanding the precise form of each individual structure and the interactions between structures may aid in understanding their origins and c…
Search and study of young infrared stellar clusters
Azatyan, Naira
The main aim of this paper is to study both the Interstellar Medium (ISM) and the young stellar population in the three star-forming regions, namely IRAS 05137+3919, 05168+3634, and 19110+1045. The study of the ISM includes determination of the hydrogen column density (N(H2)) and dust temperature (Td) in the regions using mod…