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Role of the Coronal Environment in the Formation of Four Shocks Observed without Coronal Mass Ejections at Earth's Lagrangian Point L1
Pick, M.; Magdalenić, J.; Bocchialini, K. +3 more
The main goal of this study is to determine the solar origin of four single shocks observed at the Lagrange point L1 and followed by storm sudden commencements (SSCs) during 2002. We look for associated coronal mass ejections (CMEs), starting from estimates of the transit time from Sun to Earth. For each CME, we investigate its association with a …
Long-term Activity in Photospheres of Low-mass Stars with Strong Magnetic Fields
Bondar', N. I.; Katsova, M. M.
The behavior of the average annual luminosity of K–M dwarfs OU Gem, EQ Vir, V1005 Ori and AU Mic was studied at time intervals of several decades. The main sources of photometric data for 1989–2019 were the Hipparcos, ASAS, KWS databases. An analysis of long-term series showed that the average annual brightness of all stars varies cyclical. The du…
Exoplanets in the Antarctic Sky. IV. Dual-band Photometry of Variables Found by the CSTAR-II Commissioning Survey at the North Sky
Wittenmyer, Robert A.; Wang, Lifan; Yang, Ming +30 more
From the experiences learned in three decades of exoplanet search, wide-field transit surveys have proven to be one of the most effective ways to detect exoplanets. Wide field of view, however, suffers from high false-positive rates caused by blended eclipsing binaries. The chromaticity in eclipse depth is an effective feature to distinguish low-d…
Discovery of deep eclipses in the cataclysmic variable IPHAS J013031.89+622132.3
Kozhevnikov, V. P.
I performed photometric observations of the poorly studied cataclysmic variable IPHAS J013031.89+622132.3 and discovered very deep eclipses. I obtained observations over 14 nights for a total time of 50 hours during a time span of 6 months. Thanks to the long observation interval, I determined the orbital period with high precision, Porb
Broadband X-Ray Observation of Broad-line Radio Galaxy 3C 109
Fabian, Andrew C.; Kara, Erin; Lohfink, Anne M. +1 more
We present a study of the central engine in the broad-line radio galaxy 3C 109. To investigate the immediate surrounding of this accreting, supermassive black hole, we perform a multiepoch broadband spectral analysis of a joint NuSTAR/XMM observation (2017), an archival XMM observation (2005) and the 105 month averaged Swift-BAT data. We are able …
The K supergiant runaway star HD 137071
Comerón, F.; Figueras, F.
Context. Extensive work exists on runaway massive stars with peculiar motions that are much higher than those typical of the extreme Population I to which they belong. Work on runaways has focused almost exclusively on O and B stars, most of which undergo a red supergiant phase before ending their lives as supernovae. Very few examples are known o…
Detection and characterization of stellar magnetic activity with Gaia
Lanzafame, Alessandro; Distefano, Elisa
The Gaia Data Release 2 (DR2) supplied a catalog of 147,644 late-type stars for which the analysis of the G-band photometric time series allowed the detection of the rotation period and an estimate of the magnetic activity level. The Gaia DR3 will be based on photometric time series spanning a longer time interval and will allow the detection and …
The near-infrared polarization of the pre-planetary nebula Frosty Leo
Luna, A.; Sabin, L.; Mayya, Y. D. +3 more
We present a near-infrared imaging polarimetric study of the pre-planetary nebula: Frosty Leo. The observations were carried out in J, H, and K' bands using the new polarimeter POLICAN mounted on the 2.1-m telescope of the Guillermo Haro Astrophysical Observatory, Sonora, Mexico. The most prominent result observed in the polarization maps is a lar…
EUV Wave Detection and Characterization Using Deep Learning
Liu, Sixuan; Xu, Long; Yan, Yihua +1 more
Coronal Mass Ejections (CMEs) are the most violent solar bursts. They cause severe disturbances in the solar-terrestrial space and affect human activities in many aspects, especially causing damage to high-tech infrastructure. It usually takes few hours for a CME to arrive at the Earth after eruption. Therefore, many efforts have been devoted to C…
Measuring the mass of the supermassive black hole of the lenticular galaxy NGC 4546
Ricci, T. V.; Steiner, J. E.
Most galaxies with a well-structured bulge host a supermassive black hole (SMBH) in their centre. Stellar kinematics models applied to adaptive optics (AO) assisted integral field unit observations are well-suited to measure the SMBH mass (MBH) and also the total mass-to-light ratio [(M/L)TOT] and possible anisotropies in the…