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Multiple Stellar Populations in Asymptotic Giant Branch Stars of Galactic Globular Clusters
Milone, A. P.; Cordoni, G.; Marino, A. F. +8 more
Multiple stellar populations (MPs) are a distinct characteristic of globular clusters (GCs). Their general properties have been widely studied among main-sequence, red giant branch (RGB), and horizontal branch (HB) stars, but a common framework is still missing at later evolutionary stages. We studied the MP phenomenon along the asymptotic giant b…
The Late-time Radio Behavior of Gamma-ray Burst Afterglows: Testing the Standard Model
Fruchter, Andrew S.; Kangas, Tuomas
We examine a sample of 21 gamma-ray burst (GRB) afterglow light curves at radio frequencies and compare them to the X-ray and/or optical properties of the afterglows and to the predictions of the standard jet/fireball model. Our sample includes every Swift GRB with an X-ray light curve indicating a jet break and with a published radio light curve,…
A Near-infrared Survey of UV-excited Molecular Hydrogen in Photodissociation Regions
Kim, Hwihyun; Dinerstein, Harriet L.; Jaffe, Daniel T. +1 more
We present a comparative study of the near-infrared (NIR) H2 line emission from five regions near hot young stars: Sharpless 140, NGC 2023, IC 63, the Horsehead Nebula, and the Orion Bar. This emission originates in photodissociation or photon-dominated regions (PDRs), interfaces between photoionized and molecular gas near hot (O) stars…
The Be Star 66 Ophiuchi: 60 Years of Disk Evolution
Carciofi, A. C.; Mota, B. C.; Jones, C. E. +5 more
We use a time-dependent hydrodynamic code and a non-LTE Monte Carlo code to model disk dissipation for the Be star 66 Ophiuchi. We compiled 63 years of observations from 1957 to 2020 to encompass the complete history of the growth and subsequent dissipation of the star's disk. Our models are constrained by new and archival photometry, spectroscopy…
Most of the cool CGM of star-forming galaxies is not produced by supernova feedback
Afruni, Andrea; Fraternali, Filippo; Pezzulli, Gabriele
The characterization of the large amount of gas residing in the galaxy haloes, the so-called circumgalactic medium (CGM), is crucial to understand galaxy evolution across cosmic time. We focus here on the cool (T ~ 104 K) phase of this medium around star-forming galaxies in the local Universe, whose properties and dynamics are poorly un…
New open clusters found by manual mining of data based on Gaia DR2
Casado, Juan
The physical nature of a series of 20 new open clusters is confirmed employing existing data on putative star members, mainly from the second Gaia Data Release (DR2). The clusters were discovered as overdensities of stars by visual inspection of either photographic DSS plates or proper motion plots of random source fields. The reported objects are…
Caltech-NRAO Stripe 82 Survey (CNSS). V. AGNs That Transitioned to Radio-loud State
Gromadzki, Mariusz; Hallinan, Gregg; Ishwara-Chandra, C. H. +6 more
A recent multiyear Caltech-NRAO Stripe 82 Survey revealed a group of objects that appeared as new radio sources after >5-20 yr of absence. They are transient phenomena with respect to the Faint Images of the Radio Sky at Twenty Centimeters survey and constitute the first unbiased sample of renewed radio activity. Here we present a follow-up, ra…
Identifying Planetary Transit Candidates in TESS Full-frame Image Light Curves via Convolutional Neural Networks
Powell, Brian P.; Barclay, Thomas; Kruse, Ethan +8 more
The Transiting Exoplanet Survey Satellite (TESS) mission measured light from stars in ∼75% of the sky throughout its 2 yr primary mission, resulting in millions of TESS 30-minute-cadence light curves to analyze in the search for transiting exoplanets. To search this vast data trove for transit signals, we aim to provide an approach that both is co…
Flaring and Spot Activities on the Semi-detached Binary System KIC 06852488
Shi, Xiang-dong; Qian, Sheng-bang; Li, Lin-jia +1 more
The continuous and unbroken time-series photometry data of Kepler and the Transiting Exoplanet Survey Satellite (TESS) provide a good opportunity to study the continuous variations in the light curve of binary stars. This paper reports the discoveries of the correlation between the two maxima on the light curve of KIC 06852488 and the correlation …
Hybrid Comptonization and Electron-Positron Pair Production in the Black-hole X-Ray Binary MAXI J1820+070
Poutanen, Juri; Zdziarski, Andrzej A.; Szanecki, Michał +6 more
We study X-ray and soft gamma-ray spectra from the hard state of the accreting black-hole binary MAXI J1820+070. We perform an analysis of two joint spectra from NuSTAR and INTEGRAL, covering the range of 3-650 keV, and of an average joint spectrum over the rise of the hard state, covering the 3-2200 keV range. The spectra are well modeled by Comp…