Search Publications
Missions
Journals
Publication Years
A high-resolution extinction mapping technique for face-on disc galaxies
Peretto, Nicolas; Smith, Matthew W. L.; Davis, Timothy A. +5 more
We present a new dust extinction technique with which we are able to retrieve parsec-scale gas surface density maps for entire nearby galaxies. The method measures the dust attenuation in optical bands on a pixel-by-pixel basis against a smoothed, reconstructed stellar distribution. The contribution of foreground light along the line-of-sight is c…
Photometric metallicities of fundamental-mode RR Lyr stars from Gaia G band photometry of globular-cluster variables
Hajdu, Gergely; Jurcsik, Johanna
Photometric metallicity formulae of fundamental-mode RR Lyr (RRab) stars are presented using globular-cluster data exclusively. The aim is to check whether this selection may help increasing the overall accuracy of the fits and eliminating the systematic bias of the photometric results, namely that they tend to overestimate [Fe/H] of the most meta…
X-ray Luminosity Versus Orbital Period of AM CVn Systems
Maccarone, T. J.; Begari, T.
AM CVn systems are a rare type of cataclysmic variable star consisting of a white dwarf accreting material from a low-mass, hydrogen-poor donor star. These helium-rich systems usually have orbital periods that are less than 65 minutes and are predicted to be sources of gravitational waves. We have analyzed the catalogued x-ray data from the Chandr…
Pre-main-sequence Brackett Emitters in the APOGEE DR17 Catalog: Line Strengths and Physical Properties of Accretion Columns
Stassun, Keivan G.; Kounkel, Marina; Stringfellow, Guy S. +21 more
Very young (t ≲ 10 Myr) stars possess strong magnetic fields that channel ionized gas from the interiors of their circumstellar disks to the surface of the star. Upon impacting the stellar surface, the shocked gas recombines and emits hydrogen spectral lines. To characterize the density and temperature of the gas within these accretion streams, we…
Solar Control of the Pickup Ion Plume in the Dayside Magnetosheath of Venus
Xu, Qi; Zuo, Pingbing; Xu, Xiaojun +3 more
Using the 8.5-year Venus Express measurements, we demonstrate the asymmetric plasma distributions in the Venusian magnetosheath. An escaping plume is formed by pickup oxygen ions in the hemisphere where the motional electric field points outward from Venus, while the velocity of solar wind protons is faster in the opposite hemisphere. The pickup O…
Comprehensive spectroscopic and photometric study of pulsating eclipsing binary star AI Hya
Handler, G.; Kambe, E.; Giarrusso, M. +9 more
The pulsating eclipsing binaries are remarkable systems that provide an opportunity to probe the stellar interior and to determine the fundamental stellar parameters precisely. Especially the detached eclipsing binary systems with (a) pulsating component(s) are significant objects to understand the nature of the oscillations since the binary effec…
A search for the missing baryons with X-ray absorption lines towards the blazar 1ES 1553+113
de Plaa, Jelle; Bonamente, Massimiliano; Nevalainen, Jukka +5 more
This paper presents an analysis of XMM-Newton and Chandra X-ray spectra of the quasar 1ES 1553+113, in search for absorption lines from the intervening warm-hot intergalactic medium (WHIM). A search for O VII, O VIII, and Ne IX resonance absorption lines was performed at eight fixed redshifts that feature O VI or H I broad Lyman α absorption lines…
Quantifying the influence of bars on action-based dynamical modelling of disc galaxies
Green, Gregory M.; Trick, Wilma H.; Ghosh, Soumavo
Action-based dynamical modelling, using stars as dynamical tracers, is an excellent diagnostic to estimate the underlying axisymmetric matter distribution of the Milky Way. However, the Milky Way's bar causes non-axisymmetric resonance features in the stellar disc. Using RoadMapping (an action-based dynamical modelling framework to estimate the gr…
Uncovering new white dwarf–open cluster associations using Gaia DR3
Prišegen, M.; Faltová, N.
Context. Open clusters (OCs) provide homogeneous samples of white dwarfs (WDs) with known distances, extinctions, and total ages. The unprecedented astrometric precision of Gaia allows us to identify many novel OC–WD pairs. Studying WDs in the context of their parent OCs makes it possible to determine the properties of WD progenitors and study the…
Recent progress on magnetic reconnection by in situ measurements
Lu, Quanming; Wang, Rongsheng; Lu, San +2 more
In the last decades, a few spacecraft missions have been launched to investigate the process of magnetic reconnection in space, during which magnetic free energy is explosively released into plasma kinetic energy and heating. Due to the sophisticated in situ measurements of the spacecraft missions, a big progress has been achieved over the last de…