Search Publications
Detection Capability of Flux Ropes during the Solar Orbiter Mission
Telloni, Daniele; Zank, Gary P.; Adhikari, Laxman +6 more
Flux ropes are interplanetary magnetic helical structures that are receiving increasing attention because of their likely role in magnetohydrodynamic (MHD) processes as well as their impact on space weather science. A very promising and powerful approach to address their investigation and characterization is based on wavelet spectrograms of the in…
Massive Stars in Molecular Clouds Rich in High-energy Sources: The Bridge of G332.809-0.132 and CS 78 in NGC 6334
Menten, Karl M.; Figer, Donald F.; Messineo, Maria +1 more
Detections of massive stars in the direction of the H II region CS 78 in NGC 6334 and of G332.809-0.132 are here presented. The region covered by the G332.809-0.132 complex coincides with the RCW 103 stellar association. In its core (40' in radius), approximately 110 OB candidate stars (Ks < 10 mag and 0.4 < ${A}_{{K}_{s}}$ < 1…
A Radio Molecular Line Search for Evidence of an O-rich Environment Around Binary in Silicate Carbon Stars
Chen, Xi; Ellingsen, Simon P.; Sobolev, Andrej M. +2 more
We report observations of oxygen-rich (O-rich) radio molecular line tracers, including H2CO, H2O, and HCO+ toward 28 silicate carbon stars (SCSs). SCSs are special evolved star systems that consist of a carbon star associated with peculiar O-rich circumstellar material. Absorption in the 6 cm ${{\rm{H}}}_{2}\mathrm…
On the binary orbit of Henry Draper one ( HD 1)
Strassmeier, Klaus G.; Weber, Michael
We present our final orbit for the late type spectroscopic binary Henry Draper one (HD 1). area total of 553 spectra from 13 years of observations are used with our robotic STELLA facility and its high resolution echelle spectrograph SES. Its long term radial velocity stability is ≈50 m s-1. A single radial velocity of HD 1 reached an r…
Changes in detection characteristics of CdTe X-ray sensors by proton irradiation
Commichau, V.; Grimm, O.; Bednarzik, M. +1 more
This paper reports on the performance changes in CdTe:Cl semiconductor X-ray detectors seen after irradiation with 50 MeV protons up to a fluence of 1.6 ṡ1011cm-2. The rationale for the irradiation parameters is described. Performance was quantified before and after irradiations by obtaining X-ray spectra with a barium-133 ra…
Automatic Evaluation of the Initial Geopositioning Accuracy for Large Area Planetary Remote Sensing Images
Wang, J.; Geng, X.; Xu, Q. +1 more
The photogrammetric processing of large area planetary remote sensing images is still a very challenging work. In addition to the lack of ground control data and poor tie points extraction, the insufficient knowledge of the initial geopositioning accuracy of the planetary images also increases the difficulty of processing. This paper presents an a…
Chirality and magnetic configuration associated with two-ribbon solar flares: AR 10930 versus AR 11158
Chen, P. F.; Li, Bo; Yan, Yihua +2 more
The structural property of the magnetic field in flare-bearing solar active regions (ARs) is one of the key aspects for understanding and forecasting solar flares. In this paper, we make a comparative analysis on the chirality and magnetic configurations associated with two X-class two-ribbon flares happening in AR 10930 and AR 11158. The photosph…
CHESS: An innovative concept for high-resolution, far-UV spectroscopy
France, Kevin; Youngblood, Allison; Fleming, Brian +4 more
The space ultraviolet (UV) is a critical astronomical observing window, where a multitude of atomic, ionic, and molecular signatures provide crucial insight into planetary, interstellar, stellar, intergalactic, and extragalactic objects. The next generation of large space telescopes require highly sensitive, moderate-to-high resolution UV spectrog…
Local dark energy in the Sculptor Filament of galaxies
Pruzhinskaya, M. V.; Karachentsev, I. D.; Chernin, A. D.
Two dozens of different mass galaxies observed at distances less than 10 Mpc from the Local Group are organized in the elongated structure known as the Sculptor Filament. We use recent Hubble Space Telescope data on local galaxies to study the dynamical structure and evolutionary trends of the filament. An N-body computer model, which reproduces i…
Fast-rotating giant stars behind the Coma Berenices star cluster
Fernández, Matilde; Alfaro, Emilio J.; Casanova, Víctor +2 more
In the frame of a study of the empirical isochrones of young stellar clusters, we have carried out BVIc Johnson-Cousins photometry of a sample of K and M stars of the Coma Berenices star cluster. All these stars have known rotational periods. Our main goal is to get a valuable reference on the colour-magnitude diagram, Mv ver…