Search Publications
Missions
Journals
Publication Years
A Study of the NGC 1193 and NGC 1798 Open Clusters Using CCD UBV Photometric and Gaia EDR3 Data
Bilir, S.; Yontan, T.; Çakmak, T. +8 more
We present photometric, astrometric, and kinematic studies of the old open star clusters NGC 1193 and NGC 1798. Both of the clusters are investigated by combining data sets from Gaia Early Data Release 3 (EDR3) and CCD UBV observational data. E(B − V) color excesses are derived for NGC 1193 as 0.150 ± 0.037 and for NGC 1798 as 0.505 ± 0.100 mag th…
Thermal emission from bow shocks. II. 3D magnetohydrodynamic models of ζ Ophiuchi
Kavanagh, Patrick; Green, Samuel; Mackey, Jonathan +3 more
The nearby, massive, runaway star ζ Ophiuchi has a large bow shock detected in optical and infrared light and, uniquely among runaway O stars, diffuse X-ray emission detected from the shocked stellar wind. Here we make the first detailed computational investigation of the bow shock of ζ Ophiuchi, to test whether a simple model of the bow shock can…
Water vapor saturation and ice cloud occurrence in the atmosphere of Mars
Vandaele, Ann Carine; Aoki, Shohei; Kleinböhl, Armin +3 more
We investigate water vapor saturation in the martian atmosphere in the presence or proximity of water ice clouds. We evaluate mixing ratio profiles of ambient water vapor derived from measurements by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) and the Nadir and Occultation for MArs Discovery (NOMAD) instrument in comparison wi…
Non-local thermodynamic equilibrium spectral analysis of five hot, hydrogen-deficient pre-white dwarfs
Raddi, Roberto; Munari, Ulisse; Werner, Klaus +3 more
Hot, compact, hydrogen-deficient pre-white dwarfs (pre-WDs) with effective temperatures of Teff > 70 000 K and a surface gravity of 5.0 < logg < 7.0 are rather rare objects despite recent and ongoing surveys. It is believed that they are the outcome of either single star evolution (late helium-shell flash or late helium-core fl…
Mapping out the Stellar Populations of IC 2602 and IC 2391
Henry, Todd J.; James, Hodari-Sadiki; Jao, Wei-Chun +4 more
IC 2391 and IC 2602 are important benchmarks for testing early star and planet evolution theories, both structural and dynamical, because they are the nearest open clusters with ages of ~50 Myr. We refine membership lists for these clusters by identifying candidate members using Gaia DR2 kinematic and distance information. We identify 451 candidat…
The high-velocity clouds above the disc of the outer Milky Way: misty precipitating gas in a region roiled by stellar streams
Tripp, Todd M.
The high-velocity clouds (HVCs) in the outer Milky Way at 20° < l < 190° have similar spatial locations, metallicities, and kinematics. Moreover, their locations and kinematics are coincident with several extraplanar stellar streams. The HVC origins may be connected to the stellar streams, either stripped directly from them or precipitated b…
XMM-Newton and Swift observations of supergiant high mass X-ray binaries
Romano, P.; Ferrigno, C.; Bozzo, E.
Wind-fed supergiant X-ray binaries are precious laboratories not only to study accretion under extreme gravity and magnetic field conditions, but also to probe the still highly debated properties of massive star winds. These include clumps, originating from the inherent instability of line driven winds, and larger structures. In this paper we repo…
Study of X-Ray Intraday Variability of HBL Blazars Based on Observations Obtained with XMM-Newton
Gupta, Alok C.; Wiita, Paul J.; Jithesh, V. +1 more
We present an extensive study on the X-ray intraday variability of 10 teraelectronvolt-emitting high synchrotron peaked blazars (HBLs): 1ES 0229+200, 1ES 0414+009, PKS 0548-322, 1ES 1101-232, 1H 1219+301, H 1426+428, Mrk 501, 1ES 1959+650, PKS 2005-489, and 1ES 2344+514 made with 25 XMM-Newton pointed observations during its operational period. In…
Thermal Phase Curves of XO-3b: An Eccentric Hot Jupiter at the Deuterium Burning Limit
Deming, Drake; Burrows, Adam; Fortney, Jonathan J. +15 more
We report Spitzer full-orbit phase observations of the eccentric hot Jupiter XO-3b at 3.6 and 4.5 µm. Our new eclipse depth measurements of 1770 ± 180 ppm at 3.6 µm and 1610 ± 70 ppm at 4.5 µm show no evidence of the previously reported dayside temperature inversion. We also empirically derive the mass and radius of XO-3b and its…
Ca II triplet spectroscopy of Small Magellanic Cloud red giants. VI. Analysis of chemical properties of the main body
Geisler, D.; Mauro, F.; Angelo, M. S. +5 more
Aims: In this paper we analyze the chemical evolution of the main body of the SMC, adding six additional clusters to previously published samples, based on homogeneously determined and accurate metallicities.
Methods: We derived radial velocities and Ca II Triplet (CaT) metallicity of more than 150 red giants stars in six SMC star cluste…