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Quantifying Chemical and Kinematical Properties of Galactic Disks
Hu, Guozhen; Shao, Zhengyi
We aim to quantify the chemical and kinematical properties of Galactic disks with a sample of 119,558 giant stars having abundances and 3D velocities taken or derived from the APOGEE DR17 and Gaia EDR3 catalogs. A Gaussian mixture model is employed to distinguish the high-α and low-α sequences along the metallicity by simultaneously using chemical…
Extended population associated with W40
Comerón, F.; Schneider, N.; Djupvik, A. A.
Context. W40 is a heavily obscured bipolar HII region projected in the direction of the Aquila Rift and ionized by hot stars in a central, partly embedded cluster. The study of the cluster and its surroundings has been greatly hampered thus far by the strong extinction in the region.
Aims: Our aim is to improve the characterization of the W40…
Mid-infrared time-domain study of recent dust production events in the extreme debris disc of TYC 4209-1322-1
Pál, András; Rieke, George H.; Moór, Attila +24 more
Extreme debris discs are characterized by unusually strong mid-infrared excess emission, which often proves to be variable. The warm dust in these discs is of transient nature and is likely related to a recent giant collision occurring close to the star in the terrestrial region. Here we present the results of a 877 d long, gap-free photometric mo…
How the spectral energy distribution and galaxy morphology constrain each other, with application to morphological selection using galaxy colours
Kaviraj, Sugata; Uzeirbegovic, Emir; Martin, Garreth
We introduce an empirical methodology to study how the spectral energy distribution (SED) and galaxy morphology constrain each other and implement this on ~8000 galaxies from the HST CANDELS survey in the GOODS-South field. We show that the SED does constrain morphology and present a method that quantifies the strength of the link between these tw…
An astrometric and photometric study of the young open cluster NGC 2168 and its possible member [NBN2015]77
Hendy, Y. H. M.; Shokry, A.; Saad, S. M. +2 more
We present an astrometric and photometric study of the young open star cluster NGC 2168 and its proposed member [NBN2015]77. NGC 2168 was investigated by combining data from both the Gaia-ESO DR2 and the 2MASS databases. The photometric analysis and light curve modeling of the W UMa star [NBN2015] 77 in V and R bands was performed using the Wilson…
The Effect of Age on the Grouping of Open Clusters: II—Are There Old Binary Clusters?
Casado, Juan
In the present study, we continue testing the Primordial Group hypothesis (Casado 2022), which postulates that only sufficiently young open clusters can be binary or multiple, and old clusters are essentially single. To this end, we revisit all the remaining binary cluster candidates in the Galaxy having at least one cluster older than 100 Myr thr…
Detailed Spectroscopy of Post-AGB Supergiant GSC 04050–02366 in IRAS Z02229+6208 IR Source System
Klochkova, V. G.; Panchuk, V. E.
—In the optical spectra of the cold post-AGB supergiant GSC
Discovery of an optical cocoon tail behind the runaway HD 185806
Meyer, D. M. -A.; Boumis, P.; Gvaramadze, V. V. +6 more
Studies on the circumstellar structures around evolved stars provide vital information on the evolution of the parent star and the properties of the local interstellar medium. In this work, we present the discovery and characterization of an optical cocoon tail behind the star HD 185806. The cocoon apex emission is puzzling, as it is detected in t…
Structural Architecture and Deformation History of Tempe Terra, Mars
Thomas, M.; Orlov, C. J.; Bramham, E. K. +3 more
The structurally complex region of Tempe Terra, located in the northeast of the Tharsis Rise on Mars, preserves deformation related to the growth of Tharsis and lies along the trendline formed by the Tharsis Montes volcanoes. We characterize the spatiotemporal tectonic evolution of Tempe Terra based on comprehensive structural mapping. From this m…
Measuring the Nonaxially Symmetric Surface Temperature Distribution of the Central Compact Object in Puppis A
Gotthelf, E. V.; Halpern, J. P.; Perna, R. +1 more
The surface temperature distributions of central compact objects (CCOs) are powerful probes of their crustal magnetic field strengths and geometries. Here we model the surface temperature distribution of RX J0822-4300, the CCO in the Puppis A supernova remnant, using 471 ks of XMM-Newton data. We compute the energy-dependent pulse profiles in 16 e…