Search Publications
Chemical abundance analysis of symbiotic giants. Metallicity and CNO abundance patterns in 14 northern S-type systems
Mikołajewska, Joanna; Hinkle, Kenneth H.; Joyce, Richard R. +1 more
In previous works, we computed abundances for the red giant in nearly four dozen S-type symbiotic systems (SySt). The abundances provide information about metallicity, evolutionary status, and possible memberships in Galactic stellar populations. Here, we extend our studies with a northern hemisphere sample of SySt. This northern sample is dominat…
Chemical enrichment of ICM within the Centaurus cluster - I. Radial profiles
Fabian, A. C.; Pinto, C.; Eckert, D. +6 more
We examine deep XMM-Newton European Photon Imaging Camera pn observations of the Centaurus cluster to study the hot intracluster medium (ICM) and radial metal distributions within such an environment. We found that the best-fitting spectral model corresponds to a lognormal temperature distribution, with discontinuities around ~10, ~50, and ~100 kp…
A naive Bayes classifier for identifying Class II YSOs
Wilson, Tom J.; Naylor, Tim; Wilson, Andrew J. +1 more
A naive Bayes classifier for identifying Class II YSOs has been constructed and applied to a region of the Northern Galactic Plane containing 8 million sources with good quality Gaia EDR3 parallaxes. The classifier uses the five features: Gaia G-band variability, WISE mid-infrared excess, UKIDSS and 2MASS near-infrared excess, IGAPS Hα excess, and…
A search for transients in the Reionization Lensing Cluster Survey (RELICS): three new supernovae
Mahler, Guillaume; Frye, Brenda L.; Kelly, Patrick L. +16 more
The Reionization Cluster Survey imaged 41 galaxy clusters with the Hubble Space Telescope (HST), in order to detect lensed and high-redshift galaxies. Each cluster was imaged to about 26.5 AB mag in three optical and four near-infrared bands, taken in two distinct visits separated by varying time intervals. We make use of the multiple near-infrare…
A transient ultraviolet outflow in the short-period X-ray binary UW CrB
Maccarone, T. J.; Degenaar, N.; Knigge, C. +4 more
Accreting low-mass X-ray binaries (LMXBs) are capable of launching powerful outflows such as accretion disc winds. In disc winds, vast amounts of material can be carried away, potentially greatly impacting the binary and its environment. Previous studies have uncovered signatures of disc winds in the X-ray, optical, near-infrared, and recently eve…
1D non-LTE corrections for chemical abundance analyses of very metal-poor stars
Jablonka, P.; Hill, V.; Sitnova, T. +3 more
Detailed chemical abundances of very metal-poor (VMP; [Fe/H] < -2) stars are important for better understanding the first stars, early star formation, and chemical enrichment of galaxies. Big on-going and coming high-resolution spectroscopic surveys provide a wealth of material that needs to be carefully analysed. For VMP stars, their elemental…
A Herschel study of G214.5-1.8: a young, cold, and quiescent giant molecular filament on the shell of a H I superbubble
Schneider, N.; Sánchez-Monge, Á.; Clarke, S. D. +3 more
We present an analysis of the outer Galaxy giant molecular filament (GMF) G214.5-1.8 (G214.5) using Herschel data. We find that G214.5 has a mass of ~16 000 M⊙, yet hosts only 15 potentially protostellar 70-$\mu$m sources, making it highly quiescent compared to equally massive clouds such as Serpens and Mon R2. We show that G214.5 has a…
Measuring the variability of directly imaged exoplanets using vector Apodizing Phase Plates combined with ground-based differential spectrophotometry
Ertel, Steve; Woodward, Charles E.; Kenworthy, Matthew A. +11 more
Clouds and other features in exoplanet and brown dwarf atmospheres cause variations in brightness as they rotate in and out of view. Ground-based instruments reach the high contrasts and small inner working angles needed to monitor these faint companions, but their small fields of view lack simultaneous photometric references to correct for non-as…
Bridging the gap in the mass-size relation of compact galaxies with MaNGA
Domínguez-Sánchez, H.; Ferré-Mateu, A.; Grèbol-Tomàs, P.
We present the analysis of the full Mapping Nearby Galaxies at APO (MaNGA) DR17 sample to characterize its population of compact galaxies. We focus on galaxies that fill the stellar mass (M⋆) gap between compact elliptical galaxies (cEs; 8 ≲ log (M⋆/M⊙) ≲ 10) and compact massive galaxies (CMGs; 10 ≲ log (M⋆
Radio jet-ISM interaction and positive radio-mechanical feedback in Abell 1795
McNamara, Brian R.; Carniani, Stefano; Maiolino, Roberto +8 more
We present XSHOOTER observations with previous ALMA, MUSE, and HST observations to study the nature of radio jet triggered star formation and the interaction of radio jets with the interstellar medium in the brightest cluster galaxy (BCG) in the Abell 1795 cluster. Using HST UV data, we determined an ongoing star formation rate of 9.3 M⊙