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Photometric Classifications of Evolved Massive Stars: Preparing for the Era of Webb and Roman with Machine Learning
Davenport, James R. A.; Dorn-Wallenstein, Trevor Z.; Levesque, Emily M. +1 more
In the coming years, next-generation space-based infrared observatories will significantly increase our samples of rare massive stars, representing a tremendous opportunity to leverage modern statistical tools and methods to test massive stellar evolution in entirely new environments. Such work is only possible if the observed objects can be relia…
Globular Cluster Systems of Massive Compact Elliptical Galaxies in the Local Universe: Evidence for Relic Red Nuggets?
Lee, Myung Gyoon; Kang, Jisu
Nearby massive compact elliptical galaxies (MCEGs) are strong candidates for relic galaxies (i.e., local analogs of red nuggets at high redshifts). It is expected that the globular cluster (GC) systems of relic galaxies are dominated by red (metal-rich) GCs. NGC 1277 is known as a unique example of such a galaxy in the previous study. In this stud…
On the origin of the Kreutz family of sungrazing comets
Lemos, Pablo; Fernández, Julio A.; Gallardo, Tabaré
We evaluate numerically three different models for the parent comet of the Kreutz family of sungrazers: (i) A Centaur on a highly inclined or retrograde orbit that diffuse to the inner planetary region where it became a sungrazer (Model 1). (ii) A parent comet injected from the Oort cloud straight into a near-parabolic, sungrazing orbit. Near peri…
Tectonic Deformation and Volatile Loss in the Formation of Noctis Labyrinthus, Mars
Kling, Corbin L.; Byrne, Paul K.; Wegmann, Karl W. +1 more
Noctis Labyrinthus is a little-studied and structurally complex area situated between the Tharsis Rise and Valles Marineris on Mars. Noctis Labyrinthus is dissected by normal faults that form horst and graben, pit craters situated inside the graben, and large troughs that cross-cut both graben and pit craters. Mass wasting, periglacial, and some e…
Kinematics of the Milky Way from the Gaia EDR3 red giants and subgiants
Akhmetov, V. S.; Fedorov, P. N.; Velichko, A. B. +2 more
We present the results of the kinematic investigations carried out with the use of spatial velocities of red giants and subgiants contained in the Gaia EDR3 catalogue. The 12 kinematic parameters of the Ogorodnikov-Milne model have been derived for stellar systems with radii of 0.5 and 1.0 kpc, located along the direction of the Galactic Centre-th…
Dust in the central parsecs of unobscured AGN: more challenges to the torus
Nadolny, Jakub; Prieto, M. Almudena; Fernández-Ontiveros, Juan A. +1 more
A parsec-scale dusty torus is thought to be the cause of active galactic nuclei (AGN) dichotomy in the 1/2 types, narrow/broad emission lines. In a previous work, on the basis of parsec-scale resolution infrared/optical dust maps, it was found that dust filaments, few parsecs wide and several hundred parsecs long, were ubiquitous features crossing…
The stellar system HIP 101227: is it a binary, a triple or a quadruple system?
Annuar, Adlyka; Al-Wardat, Mashhoor; Yousef, Zahra Talal +4 more
In this paper, we present the analysis of the stellar system HIP 101227 to determine the actual number of components in the system, and their properties. We use dynamical modeling and complex spectrophotometric (involving atmospheric modeling) techniques with recent data, to determine the physical properties and orbital solution for the system, re…
The nature of sub-millimetre galaxies I: a comparison of AGN and star-forming galaxy SED fits
Wang, L.; Heywood, I.; Metcalfe, N. +3 more
High-redshift sub-millimetre galaxies (SMGs) are usually assumed to be powered by star formation. However, it has been clear for some time that >20 per cent of such sourcesbrighter than ≈3 mJy host quasars. Here, we analyse a complete sample of 12 sub-mm LABOCA/ALMA 870-µm sources in the centre of the William Herschel Deep Field (WHDF) wi…
Observational Evidence Points at AGB Stars as Possible Progenitors of CEMP-s and CEMP-r/s Stars
Goswami, Aruna; Purandardas, Meenakshi
The origin of enhanced abundance of heavy elements observed in the surface chemical composition of carbon-enhanced metal-poor (CEMP) stars still remains poorly understood. Here, we present detailed abundance analysis of seven CEMP stars based on high-resolution (R ~ 50,000) spectra that reveal enough evidence of asymptotic giant branch (AGB) stars…
Lessons from the First Multiply Imaged Supernova: Revised Strong-lensing Models for the Galaxy Cluster MACS J1149.5+2223
Zitrin, Adi
We present two grid-based lens models for the galaxy cluster MACS J1149.5+2223, concentrating on the properties of the first multiply imaged supernova Refsdal, which first appeared in this cluster as an Einstein cross (images S1-S4) around a cluster galaxy in late 2014, and about a year later as an additional image (SX) in a different image of the…