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A neural network-based methodology to select young stellar object candidates from IR surveys
Montillaud, J.; Cornu, D.
Context. Observed young stellar objects (YSOs) are used to study star formation and characterize star-forming regions. For this purpose, YSO candidate catalogs are compiled from various surveys, especially in the infrared (IR), and simple selection schemes in color-magnitude diagrams (CMDs) are often used to identify and classify YSOs.
Aims: …
Multi-instrument analysis of far-ultraviolet aurora in the southern hemisphere of comet 67P/Churyumov-Gerasimenko
Feldman, P. D.; Eriksson, A.; Biver, N. +9 more
Aims: We aim to determine whether dissociative excitation of cometary neutrals by electron impact is the major source of far-ultraviolet (FUV) emissions at comet 67P/Churyumov-Gerasimenko in the southern hemisphere at large heliocentric distances, both during quiet conditions and impacts of corotating interaction regions observed in the summe…
Born in a Pair (?): Pisces II and Pegasus III
Garofalo, Alessia; Calura, Francesco; Paris, Diego +5 more
We have used B, V time-series photometry collected with the Large Binocular Telescope to undertake the first study of variable stars in the Milky Way ultra-faint dwarf (UFD) satellites Pisces II and Pegasus III. In Pisces II we have identified an RRab star, one confirmed and a candidate SX Phoenicis star, and a variable with uncertain classificati…
Globular cluster systems of relic galaxies
Chies-Santos, Ana L.; Beasley, Michael A.; Leaman, Ryan +6 more
We analyse the globular cluster (GC) systems of a sample of 15 massive, compact early-type galaxies (ETGs), 13 of which have already been identified as good relic galaxy candidates on the basis of their compact morphologies, old stellar populations and stellar kinematics. These relic galaxy candidates are likely the nearby counterparts of high-red…
Molecular gas along the old radio jets of the cluster-central type 2 quasar IRAS 09104+4109
Babul, Arif; Phadke, Kedar A.; Chapman, Scott +4 more
We present Northern Extended Millimeter Array (NOEMA) CO(2-1) maps of the z = 0.4418 cluster-central quasi-stellar object (QSO) IRAS 09104+4109, which trace ~4.5 × 1010 M⊙ of molecular gas in and around the galaxy. As in many low-redshift cool-core clusters, the molecular gas is located in a series of clumps extending along t…
Ultra-High-Resolution 1 m/pixel CaSSIS DTM Using Super-Resolution Restoration and Shape-from-Shading: Demonstration over Oxia Planum on Mars
Tao, Yu; Muller, Jan-Peter; Conway, Susan J. +3 more
EvryFlare. IV. Detection of Periodicity in Flare Occurrence from Cool Stars with TESS
Law, Nicholas M.; Howard, Ward S.
Phased flaring, or the periodic occurrence of stellar flares, may probe electromagnetic star-planet interaction (SPI), binary interaction, or magnetic conditions in spots. For the first time, we explore flare periodograms for a large sample of flare stars to identify periodicity due to magnetic interactions with orbiting companions, magnetic reser…
Binary-driven stellar rotation evolution at the main-sequence turn-off in star clusters
Albrow, Michael D.; Deng, Licai; de Grijs, Richard +1 more
The impact of stellar rotation on the morphology of star cluster colour-magnitude diagrams is widely acknowledged. However, the physics driving the distribution of the equatorial rotation velocities of main-sequence turn-off stars is as yet poorly understood. Using Gaia Data Release 2 photometry and new Southern African Large Telescope medium-reso…
White Dwarf Photospheric Abundances in Cataclysmic Variables. I. SS Aurigae and TU Mensae
Sion, Edward M.; Godon, Patrick
Chemical abundance studies of cataclysmic variables have revealed high nitrogen to carbon ratios in a number of cataclysmic variable white dwarfs (based on ultraviolet emission and absorption lines), as well as possible carbon deficiency in many secondaries (based on the absence of infrared CO absorption lines). These indicate that the accreted ma…
Reconstructing three-dimensional densities from two-dimensional observations of molecular gas
Gutermuth, Robert A.; Pokhrel, Riwaj; Federrath, Christoph +2 more
Star formation has long been known to be an inefficient process, in the sense that only a small fraction ϵff of the mass of any given gas cloud is converted to stars per cloud free-fall time. However, developing a successful theory of star formation will require measurements of both the mean value of ϵff and its scatter from …