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Chandra and HST studies of the X-ray sources in the globular cluster NGC 362
Heinke, Craig O.; Cohn, Haldan N.; Lugger, Phyllis M. +1 more
We analyse a Chandra observation of the rich globular cluster NGC 362, finding 33 X-ray sources within 1 arcmin (1.2 half-mass radii) of the cluster centre. Spectral analysis of the brightest source (X1) shows blackbody-like emission, indicating it is likely a quiescent low-mass X-ray binary; we find a possible counterpart that falls in the sub-su…
Hubble Space Telescope proper motions of Large Magellanic Cloud star clusters: I. Catalogues and results for NGC 1850
Martocchia, S.; Cabrera-Ziri, I.; Bastian, N. +11 more
We present proper motion (PM) measurements for a sample of 23 massive star clusters within the Large Magellanic Cloud using multi-epoch data from the Hubble Space Telescope (HST). We combined archival data from the ACS/WFC and WFC3/UVIS instruments with observations from a dedicated HST programme, resulting in time baselines between 4.7 and 18.2 y…
The Lockman-SpReSO project. Main properties of infrared-selected star-forming galaxies
Krongold, Yair; Sánchez-Portal, Miguel; Bongiovanni, Ángel +18 more
Aims: In this work, we carry out a comprehensive study using galaxy data from the Lockman Spectroscopic Redshift Survey using Osiris (Lockman-SpReSO) project, a far-infrared (FIR) selected sample of galaxies observed using optical spectroscopy. We analyse a sub-sample of star-forming galaxies (SFGs) with secure spectroscopic redshifts, mostly…
Searching the SN 1987A SETI Ellipsoid with TESS
Davenport, James R. A.; Siemion, Andrew P. V.; Cody, Ann Marie +4 more
The SETI Ellipsoid is a strategy for technosignature candidate selection that assumes that extraterrestrial civilizations who have observed a galactic-scale event—such as supernova 1987A—may use it as a Schelling point to broadcast synchronized signals indicating their presence. Continuous wide-field surveys of the sky offer a powerful new opportu…
Ultra-long-period Cepheids as Standard Candles from Gaia to Rubin-LSST
Di Criscienzo, M.; Ripepi, V.; Molinaro, R. +10 more
An analysis of the properties of ultra-long-period Cepheids (ULPs) could significantly contribute to understanding the Hubble constant tension, e.g., the current discrepancy between determinations based on local distance indicators and those relying on cosmic microwave background measurements. These highly luminous variables are observable beyond …
Large Glacier-Like Forms on Mars: Insights From Crater Morphologies and Crater Retention Ages
El-Maarry, M. R.; Driver, G.; Hubbard, B. +1 more
Glacier-Like Forms (GLFs) are a subset of ice-rich landforms known as Viscous Flow Features that populate Mars' mid-latitudes. GLFs are morphologically similar to terrestrial valley glaciers and are thought to result from the redistribution of water ice from the Martian poles during periods of high obliquity throughout the Amazonian period. Their …
A comprehensive study of five candidate δ Scuti-type pulsators in detached eclipsing binaries
Hełminiak, K. G.; Konacki, M.; Moharana, A. +4 more
Context. Pulsating stars in eclipsing binaries (EBs) provide an excellent opportunity to obtain precise, model-independent stellar parameters for studying these oscillations in detail. One of the most common classes of pulsators found in such EBs exhibits δ Scuti-type oscillations. Characterising these pulsators using the precise stellar parameter…
Observations of Titan's Stratosphere during Northern Summer: Temperatures, CH3CN and CH3D Abundances
Butler, Bryan; Vinatier, Sandrine; Lellouch, Emmanuel +11 more
Titan's atmospheric composition and dynamical state have previously been studied over numerous epochs by both ground- and space-based facilities. However, stratospheric measurements remain sparse during Titan's northern summer and fall. The lack of seasonal symmetry in observations of Titan's temperature field and chemical abundances raises questi…
Scientific Highlights of the AGILE Gamma-ray Mission
Tavani, Marco; Pittori, Carlotta; Vercellone, Stefano
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Updated absolute parameters and kinematics of IS CMa
Alan, Neslihan; Canbay, Remziye; Evcil, Serkan +2 more
Eclipsing binary systems are significant objects for astrophysics in that direct observations can determine the fundamental parameters of stars. In this study, we precisely determined the fundamental parameters of the binary component stars obtained by simultaneous analysis of radial velocities and the TESS light curve using the Wilson and Devinne…