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A selection function toolbox for subsets of astronomical catalogues
Everall, Andrew; Boubert, Douglas
Large catalogues are ubiquitous throughout astronomy, but most scientific analyses are carried out on smaller samples selected from these catalogues by chosen cuts on catalogued quantities. The selection function of that scientific sample - the probability that a star in the catalogue will satisfy these cuts and so make it into the sample - is thu…
Unresolved Binaries in the Intermediate Mass Range in the Pleiades Star Cluster
Carraro, Giovanni; Seleznev, Anton F.; Malofeeva, Alina A.
The identification of binary stars of different mass ratios in resolved stellar populations is a challenging task. We show how the photometric diagram constructed with the pseudocolors (H-W2)-W1 versus W2-(BP-K) can be employed to estimate the binary and multiple star ratios and the distribution of their component mass ratio q effectively. As an a…
Galactic Chemical Evolution of Exoplanet Hosting Stars: Are High-mass Planetary Systems Young?
Manoj, P.; Narang, Mayank; Swastik, C. +5 more
The imprints of stellar nucleosynthesis and chemical evolution of the galaxy can be seen in different stellar populations, with older generation stars showing higher α-element abundances and the later generations becoming enriched with iron-peak elements. The evolutionary connections and chemical characteristics of circumstellar disks, stars, and …
Rapid Bursts of Magnetically Gated Accretion in the Intermediate Polar V1025 Cen
Garnavich, Peter; Littlefield, Colin; Szkody, Paula +5 more
Magnetically gated accretion has emerged as a proposed mechanism for producing extremely short, repetitive bursts of accretion onto magnetized white dwarfs in intermediate polars (IPs), but this phenomenon has not been detected previously in a confirmed IP. We report the 27 day TESS light curve of V1025 Cen, an IP that shows a remarkable series of…
Breaking Orion's Veil with fossil outflows
Bally, J.; Goicoechea, J. R.; van der Tak, F. F. S. +3 more
Context. The role of feedback in the self-regulation of star formation is a fundamental question in astrophysics. The Orion Nebula is the nearest site of ongoing and recent massive star formation. It is a unique laboratory for the study of stellar feedback. Recent SOFIA [C II] 158 µm observations have revealed an expanding bubble, the Veil s…
The COS CGM Compendium. IV. Effects of Varying Ionization Backgrounds on Metallicity Determinations in the z < 1 Circumgalactic Medium
Fox, Andrew J.; Lehner, Nicolas; Howk, J. Christopher +3 more
Metallicity estimates of circumgalactic gas based on absorption-line measurements typically require photoionization modeling to account for unseen ionization states. We explore the impact of uncertainties in the extreme-ultraviolet background (EUVB) radiation on such metallicity determinations for the z < 1 circumgalactic medium. In particular,…
New XMM-Newton observations of faint, evolved supernova remnants in the Large Magellanic Cloud
Haberl, F.; Filipović, M. D.; Maggi, P. +5 more
The Large Magellanic Cloud (LMC) hosts a rich population of supernova remnants (SNRs), our knowledge of which is the most complete of any galaxy. However, there remain many candidate SNRs, identified through optical and radio observations where additional X-ray data can confirm their SNR nature and provide details on their physical properties. In …
Grain Alignment in the Circumstellar Shell of IRC+10° 216
Sandin, Christer; Soam, Archana; Hoang, Thiem +7 more
Dust-induced polarization in the interstellar medium (ISM) is due to asymmetric grains aligned with an external reference direction, usually the magnetic field. For both the leading alignment theories, the alignment of the grain's angular momentum with one of its principal axes and the coupling with the magnetic field requires the grain to be para…
A pilot ASKAP survey for radio transients towards the Galactic Centre
Bannister, Keith W.; Kaplan, David L.; Lenc, Emil +8 more
We present the results of a radio transient and polarization survey towards the Galactic Centre, conducted as part of the Australian Square Kilometre Array Pathfinder Variables and Slow Transients pilot survey. The survey region consisted of five fields covering $\sim 265\, {\rm deg}^2$ (350○ ≲ l ≲ 10○, |b| ≲ 10○).…
Deciphering stellar metallicities in the early Universe: case study of a young galaxy at z = 4.77 in the MUSE eXtremely Deep Field
Feltre, Anna; Bacon, Roland; Verhamme, Anne +8 more
Directly characterising the first generations of stars in distant galaxies is a key quest of observational cosmology. We present a case study of ID53 at z = 4.77, the UV-brightest (but L⋆) star-forming galaxy at z > 3 in the MUSE eXtremely Deep Field with a mass of ≈109 M⊙. In addition to very strong Lyman-α (Ly…