Search Publications
Radio/X-ray correlations and variability in the X-ray binary LS I +61°303
Kraus, A.; Chernyakova, M.; Malyshev, D. +6 more
The high-mass X-ray binary LS I +61°303 exhibits variability in its radio and X-ray emissions, ranging from minute to hour time-scales. At such short time-scales, not much is known about the possible correlations between these two emissions from this source, which might offer hints to their origin. Here, we study the relationship between these emi…
Study of the Influence of an Evolving Galactic Potential on the Orbital Properties of 152 Globular Clusters with Data from the Gaia EDR3 Catalogue
Bobylev, V. V.; Bajkova, A. T.; Smirnov, A. A.
We have studied the influence of an evolving gravitational potential of the Milky Way Galaxy on the orbital motion of 152 globular clusters with proper motions from the Gaia EDR3 catalogue and mean distances from Baumgardt and Vasiliev (2021). To construct a semicosmological evolving model potential with changing masses and sizes of the Galactic c…
Swift/XRT Deep Galactic Plane Survey Discovery of a New Intermediate Polar Cataclysmic Variable, Swift J183920.1-045350
Göğüş, Ersin; Buckley, David; Kouveliotou, Chryssa +20 more
We report on the Swift/XRT Deep Galactic Plane Survey discovery and multiwavelength follow-up observations of a new intermediate polar (IP) cataclysmic variable, Swift J183920.1-045350. A 449.7 s spin period is found in XMM-Newton and NuSTAR data, accompanied by a 459.9 s optical period that is most likely the synodic, or beat period, produced fro…
Nearly 30,000 Late-type Main-sequence Stars with Stellar Age from LAMOST DR5
Zhao, Gang; Zhao, Jingkun; Ye, Xianhao +3 more
We construct a sample of nearly 30,000 main-sequence stars with 4500 K < Teff < 5000 K and stellar ages estimated by the chromospheric activity-age relation. This sample is used to determine the age distribution in the R-Z plane of the Galaxy, where R is the projected Galactocentric distance in the disk midplane and Z is the heigh…
A new approximate coupling function: The case of Forbush decreases
Xaplanteris, L.; Livada, M.; Mavromichalaki, H. +1 more
We attempt the derivation of a new coupling function between ground level and primary cosmic rays for the case of Forbush decreases. The calculations for the new function are based on basic Quantum Field Theory theoretical tools, something that has not been attempted till now in other widely used cosmic ray coupling functions. The use of Quantum F…
Titan occultations of Orion's belt observed with Cassini/UVIS
Yelle, Roger V.; Koskinen, T. T.; Palmer, M. Y.
On 1 February 2016 Titan occulted the three stars in Orion's belt, as seen from the Casssini spacecraft. The ultraviolet spectrometer on Cassini observed this event with the stars arranged along the instrument's entrance slit. These three stellar occultations probed different latitudes in Titan's northern hemisphere but similar longitudes. The occ…
Goodness-of-fit test for isochrone fitting in the Gaia era. Statistical assessment of the error distribution
Valle, G.; Dell'Omodarme, M.; Tognelli, E.
Context. The increasing precision in observational data made available by recent surveys means that the reliability of stellar models can be tested. For this purpose, a firm theoretical basis is crucial for evaluating the agreement of the data and theoretical predictions. Aims This paper presents a rigorous derivation of a goodness-of-fit statisti…
Ionospheric Ion Acceleration and Transport
André, Mats; Yau, Andrew W.; Abe, Takumi +2 more
Photometric analysis of three totally eclipsing W UMa stars with increasing periods: TYC 3700-1384-1, V1511 Her, and V1179 Her
Broens, Eric
The first multicolour light-curve models and period studies for the totally eclipsing W UMa stars TYC 3700-1384-1, V1511 Her, and V1179 Her are presented. All three stars are A-subtype W UMa stars of spectral type F. The light-curve solutions show that TYC 3700-1384-1 has a moderately low mass ratio of q = 0.182 ± 0.001 and a degree of overcontact…
Double trouble: Gaia reveals (proto)planetary systems that may experience more than one dense star-forming environment
Parker, Richard J.; Schoettler, Christina
Planetary systems appear to form contemporaneously around young stars within young star-forming regions. Within these environments, the chances of survival, as well as the long-term evolution of these systems, are influenced by factors such as dynamical interactions with other stars and photoevaporation from massive stars. These interactions can a…