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Water production rates from SOHO/SWAN observations of six comets: 2017-2020
Bertaux, J. -L.; Combi, M. R.; Shou, Y. +4 more
The Solar Wind ANisotropies (SWAN) all-sky hydrogen Lyman-alpha camera on the SOlar and Heliosphere Observer (SOHO) satellite makes daily images of the entire sky to monitor the three-dimensional distribution of solar wind and solar radiation via its imprint on the stream of interstellar hydrogen that flows through the solar system. In the process…
Fundamental parameters of the massive eclipsing binary HM1 8
Gamen, R.; Barbá, R. H.; Morrell, N. I. +5 more
We present a comprehensive study of the massive binary system HM1 8, based on multi-epoch high-resolution spectroscopy, V-band photometry, and archival X-ray data. Spectra from the OWN Survey, a high-resolution optical monitoring of Southern O and WN stars, are used to analyse the spectral morphology and perform quantitative spectroscopic analysis…
INTEGRAL serendipitous observations of solar and terrestrial X-rays and gamma rays
Churazov, Eugene; Tatischeff, Vincent; Beckmann, Volker +1 more
ESA's INTEGRAL space mission has achieved unique results for solar and terrestrial physics, although spacecraft operations nominally excluded the possibility to point at the Sun or the Earth. The Earth avoidance was, however, exceptionally relaxed for special occultation observations of the Cosmic X-ray Background (CXB), which on some occasions al…
A New Method to Estimate Halo CME Mass Using Synthetic CMEs Based on a Full Ice Cream Cone Model
Moon, Yong-Jae; Lee, Jin-Yi; Cho, Il-Hyun +1 more
In this study, we suggest a new method to estimate the mass of a halo coronal mass ejection (CME) using synthetic CMEs. For this, we generate synthetic CMEs based on two assumptions: (1) the CME structure is a full ice cream cone, and (2) the CME electron number density follows a power-law distribution (ρcme = ρ0r-n
Spectroscopic and Photometric Monitoring of a Poorly Known Highly Luminous OH/IR Star: IRAS 18278+0931
Dutta, Somnath; Mondal, Soumen; Das, Ramkrishna +1 more
We present the time-dependent properties of a poorly known OH/IR star, IRAS 18278+0931 (hereafter IRAS 18+09), toward the Ophiuchus constellation. We have carried out long-term optical/near-infrared photometric and spectroscopic observations to study the object. From optical R- and I-band light curves, the period of IRAS 18+09 is estimated to be 5…
Desaturated EUV Flare Ribbons in an X-class Flare
Krucker, Säm; Schwartz, Richard A.; Torre, Gabriele
This paper studies the energy dissipation of nonthermal electrons in the chromospheric flare ribbons during the peak time of a Geostationary Operational Environmental Satellite X-class flare (SOL2011-09-06) using desaturated Solar Dynamics Observatory/Atmospheric Imaging Assembly extreme-ultraviolet (EUV) narrow-band images. The temperature distri…
ALMA Host Galaxy Observation of the Off-axis Gamma-Ray Burst XRF 020903
Urata, Yuji; Huang, Kuiyun; Chen, Jheng-Cyun
We investigated the radio properties of the host galaxy of X-ray flash, XRF 020903, which is the best example for investigating the off-axis origin of gamma-ray bursts (GRBs). Dust continuum at 233 GHz and CO are observed using the Atacama Large millimeter/submillimeter array. The molecular gas mass derived by applying the metallicity-dependent CO…
A Study of Variations in Correlation Between Rotation Residual and Meridional Velocity of Sunspot Groups
Javaraiah, J.
We analyzed the combined 142 years sunspot-group data from Greenwich Photoheliograpic Results (GPR) and Debrecen Photoheliographic Data (DPD) and determined the yearly mean residual rotation rate and the meridional velocity of sunspot groups in different 5∘ latitude intervals. We find that there exists a considerable latitude-time depen…
Atmospheric Parameters and Evolutionary CP Stars. I.21 COM from the Old Comae Berenices Cluster
Aliev, S. G.; Alishova, Z. M.
On the basis of Hipparcos observations and complex observations carried out at the Shamakhy Astrophysical Observatory named after N. Tusi of the National Academy of Sciences of Azerbaijan, the main parameters of the atmosphere and the evolutionary status of the magnetic CP star 21 Com from the old Comae Berenices cluster have been determined.Almos…
A search for distant, pulsating red giants in the southern halo
Kendall, T. R.; Mauron, N.; Gigoyan, K. S. +1 more
To investigate the asymptotic giant branch (AGB) population in the Galactic halo, we search for pulsating AGB stars at a heliocentric distance D > 50 kpc. Our research is based on the Catalina Southern Survey (CSS) catalogue of variables, comprising 1286 long-period variables (LPVs) with δ < −20°. We first focus on the 77 stars in the cap |b…