Search Publications
Properties of shocked dust grains in supernova remnants
De Looze, I.; Gomez, H. L.; Barlow, M. J. +3 more
Shockwaves driven by supernovae both destroy dust and reprocess the surviving grains, greatly affecting the resulting dust properties of the interstellar medium (ISM). While these processes have been extensively studied theoretically, observational constraints are limited. We use physically motivated models of dust emission to fit the infrared (IR…
Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters
Bica, E.; Barbuy, B.; Cassisi, S. +6 more
Context. RR Lyrae stars are useful standard candles allowing one to derive accurate distances for old star clusters. Based on the recent catalogues from OGLE-IV and Gaia Early Data Release 3 (EDR3), the distances can be improved for a few bulge globular clusters.
Aims: The aim of this work is to derive an accurate distance for the following s…
Measurement of the Relativistic Sunyaev-Zeldovich Correction in RX J1347.5-1145
Zitrin, Adi; Daylan, Tansu; Zemcov, Michael +8 more
We present a measurement of the relativistic corrections to the thermal Sunyaev-Zel'dovich (SZ) effect spectrum, the rSZ effect, toward the massive galaxy cluster RX J1347.5-1145 by combining submillimeter images from Herschel-SPIRE with millimeter wavelength Bolocam maps. Our analysis simultaneously models the SZ effect signal, the population of …
Physical Properties of 29 sdB+dM Eclipsing Binaries in Zwicky Transient Facility
Wang, Shu; Deng, Li-Cai; Wang, Kun +3 more
The development of large-scale time-domain surveys provides an opportunity to study the physical properties as well as the evolutionary scenario of B-type subdwarfs (sdBs) and M-type dwarfs (dMs). Here, we obtained 33 sdB+dM eclipsing binaries based on the Zwicky Transient Facility (ZTF) light curves and Gaia Early Data Release 3 (EDR3) parallaxes…
The Gaia-ESO Survey: Chemical tagging in the thin disk. Open clusters blindly recovered in the elemental abundance space
Gilmore, G.; Vallenari, A.; Randich, S. +14 more
Context. The chemical makeup of a star provides the fossil information of the environment where it formed. Under this premise, it should be possible to use chemical abundances to tag stars that formed within the same stellar association. This idea - known as chemical tagging - has not produced the expected results, especially within the thin disk …
Gaia astrometric and photometric study of open clusters Dolidze 18 & Ruprecht 70
Tadross, A. L.; Hendy, Y. H.
Here, we conducted a photometric and astrometric study of two open stellar clusters Dolidze 18 and Ruprecht 70, which have not been photometrically studied before. The most important thing for using Gaia (DR2) database lies in the positions, parallax, and proper motions, which make us split cluster members from the field ones and get precise astro…
The Family of V1311 Ori: a Young Sextuple System or a Minicluster?
Tokovinin, Andrei
A compact bound group of four active M-type dwarfs containing V1311 Ori is identified in the Gaia catalog of nearby stars. Located at a distance of 39 pc, it is likely related to the β Pictoris and 32 Ori moving groups by kinematics, isochronal age, and other indicators of youth (Hα emission, presence of lithium, and fast rotation). The brightest …
A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS
Alonso, R.; Deleuil, M.; Erikson, A. +82 more
Context. Stellar occultation is a powerful technique that allows the determination of some physical parameters of the occulting object. The result depends on the photometric accuracy, the temporal resolution, and the number of chords obtained. Space telescopes can achieve high photometric accuracy as they are not affected by atmospheric scintillat…
Quasi-periodic whispers from a transient ULX in M 101: signatures of a fast-spinning neutron star?
Soria, Roberto; Pintore, Fabio; Esposito, Paolo +7 more
We have studied the unusual time variability of an ultraluminous X-ray source in M 101, 4XMM J140314.2 + 541806 (henceforth, J1403), using Chandra and XMM-Newton data. Over the last two decades, J1403 has shown short-duration outbursts with an X-ray luminosity ~1-3 × 1039 erg s-1, and longer intervals at luminosities ~0.5-1 ×…
Searching for Anomalies in the ZTF Catalog of Periodic Variable Stars
Ho, Shirley; Drout, Maria R.; O'Grady, Anna J. G. +4 more
Periodic variables illuminate the physical processes of stars throughout their lifetime. Wide-field surveys continue to increase our discovery rates of periodic variable stars. Automated approaches are essential to identify interesting periodic variable stars for multiwavelength and spectroscopic follow-up. Here we present a novel unsupervised mac…