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Our Galaxy's youngest disc
Li, Chengdong; Binney, James
We investigate the structure of our Galaxy's young stellar disc by fitting the distribution functions (DFs) of a new family to 5D Gaia data for a sample of $47\, 000$ OB stars. Tests of the fitting procedure show that the young disc's DF would be strongly constrained by Gaia data if the distribution of Galactic dust were accurately known. The DF t…
Magnetic field topology, chemical spot distributions, and photometric variability of the Ap star φ Draconis
Neiner, C.; Kochukhov, O.; Papakonstantinou, N.
The primary component of the multiple star φ Dra is one of the brightest magnetic chemically peculiar stars in the northern sky. Here, we report results of a comprehensive study of the rotational photometric variability, binarity, magnetic field geometry, and surface chemical spot structure for this star. We derived a precise photometric rotationa…
The pre-He white dwarfs in eclipsing binaries - IV. WASP 1814+48 with multiperiodic pulsations
Hong, Kyeongsoo; Lee, Jae Woo; Park, Jang-Ho +1 more
For the EL CVn candidate 1SWASPJ181417.43+481117.0 (WASP 1814+48), we secured the first spectroscopic observations between 2015 April and 2021 March. Using the echelle spectra, the radial velocities (RVs) of the primary star were measured with its atmospheric parameters of Teff, 1 = 7770 ± 130 K and $v$1sin i = 47 ± 6 km s
The X-ray spectral-timing contribution of the stellar wind in the hard state of Cyg X-1
Wilms, J.; Uttley, P.; De Marco, B. +6 more
The clumpy stellar wind from the companion star in high-mass X-ray binaries causes variable, partial absorption of the emission from the X-ray source. We studied XMM-Newton observations from a 7.22 d long monitoring campaign, in order to constrain the effects of the stellar wind on the short-time-scale X-ray spectral-timing properties of Cygnus X-…
Central Black Hole Mass in the Distant Tidal Disruption Event Candidate of Swift J2058.4+0516
Zhang, XueGuang
In this article, the central black hole (BH) mass in the distant tidal disruption event (TDE) of Swift J2058.4+0516, the second candidate of relativistic jet birth related to a TDE, is estimated. Swift J2058.4+0516 has quite different BH masses estimated through different indirect methods in the literature. Therefore, it is necessary and interesti…
Large Impact of the Mg II h and k Incident Radiation Change on Results of Radiative Transfer Models and the Importance of Dynamics
Heinzel, Petr; Gunár, Stanislav; Koza, Július +1 more
We demonstrate that changes in the incident radiation in Mg II h and k lines have a significant impact on the results of radiative transfer modeling of prominence-like plasmas. To uncover the extent of this impact and allow easy comparison, here we study two cases, one representing the minimum of the solar activity and the other corresponding to t…
Rotating Solar Models in Agreement with Helioseismic Results and Updated Neutrino Fluxes
Yang, Wuming
Standard solar models (SSMs) constructed in accordance with old solar abundances are in reasonable agreement with seismically inferred results, but SSMs with new low-metal abundances disagree with the seismically inferred results. The constraints of neutrino fluxes on solar models exist in parallel with those of helioseismic results. The solar neu…
Demographics of the M-star Multiple Population in the Orion Nebula Cluster
Reiter, Megan; Meyer, Michael R.; De Furio, Matthew +4 more
We present updated results constraining multiplicity demographics for the stellar population of the Orion Nebula Cluster (ONC, a high-mass, high-density star-forming region), across primary masses 0.08-0.7 M ⊙. Our study utilizes archival Hubble Space Telescope data obtained with the Advanced Camera for Surveys using multiple filters (G…
Star-forming and gas-rich brightest cluster galaxies at z ∼ 0.4 in the Kilo-Degree Survey
Castignani, G.; Moscardini, L.; Radovich, M. +9 more
Brightest cluster galaxies (BCGs) are typically massive ellipticals at the centers of clusters. They are believed to experience strong environmental processing, and their mass assembly and star formation history are still debated. We have selected three star-forming BCGs in the equatorial field of the Kilo-Degree Survey (KiDS). They are KiDS 0920 …
The transport of galactic cosmic rays in heliosphere: The HELMOD model compared with other commonly employed solar modulation models
Gervasi, M.; Rancoita, P. G.; Boschini, M. J. +2 more
HELMOD model allows one to describe how solar modulation affects the propagation of galactic cosmic rays (GCRs) through the heliosphere by solving the Parker transport equation. HELMOD provides modulated spectra for protons and nuclei during high and low solar activity periods, in the inner and outer heliosphere, at Earth location and outside the …