Search Publications
Quantitative Characterization of Magnetic Flux Rope Properties for Two Solar Eruption Events
Qiu, Jiong; Jiang, Chaowei; Hu, Qiang +2 more
In order to bridge the gap between heliospheric and solar observations of coronal mass ejections (CMEs), one of the key steps is to improve the understanding of their corresponding magnetic structures like the magnetic flux ropes (MFRs). But it remains a challenge to confirm the existence of a coherent MFR before or upon the CME eruption on the Su…
Modelling of multimode radially pulsating high-amplitude δ Scuti stars from the OGLE Galactic bulge sample
Smolec, R.; Netzel, H.
Thanks to relatively firm mode identification, possible based only on period ratios, high-amplitude δ Scuti stars pulsating in at least three radial modes are promising targets for asteroseismic inference. In this study, we used the most numerous sample of HADS from the OGLE inner bulge fields that likely pulsate in either three or four radial mod…
Identification of New Classical Be Stars from the LAMOST Medium Resolution Survey
Gies, Douglas R.; Wang, Luqian; Han, Zhanwen +6 more
Be stars are B-type main-sequence stars that display broad Balmer emission lines in their spectra. Identification of the Be population is essential to further examine the formation and evolutionary models. We report the detection of classical Be (CBe) stars from observations with the Large sky Area Multi-Object fiber Spectroscopic Telescope Medium…
The Yaglom Scaling of the Third-order Structure Functions in the Inner Heliosphere Observed by Helios 1 and 2
He, Jiansen; Wang, Xin; Tu, Chuanyi +2 more
The third-order scaling law, Yaglom law, of Elsässer fluctuations in the solar wind is believed to reflect the inertial range energy cascade of the MHD turbulence and provides an approach to evaluate the cascade rate. However, the occurrence ratio with the Yaglom scaling law, the fraction of the intervals where the Yaglom linear scaling is observe…
Random Forest classification of Gaia DR3 white dwarf-main sequence spectra: A feasibility study
Rebassa-Mansergas, Alberto; Torres, Santiago; Echeverry, David +1 more
Aims: The third Gaia data release provides low-resolution spectra for around 200 million sources. It is expected that a sizeable fraction of them contain a white dwarf (WD), neither isolated, or in a binary system with a main-sequence (MS) companion, that is a white dwarf-main sequence (WDMS) binary. Taking advantage of a consolidated Random …
Apsidal motion in massive eccentric binaries in NGC 6231. The case of HD 152219
Farnir, M.; Dupret, M. -A.; Rauw, G. +2 more
Context. The measurement of the apsidal motion in close eccentric massive binary systems provides essential information to probe the internal structure of the stars that compose the system.
Aims: Following the determination of the fundamental stellar and binary parameters, we make use of the tidally induced apsidal motion to infer constraints…
Activity and Rotation of Nearby Field M Dwarfs in the TESS Southern Continuous Viewing Zone
Rampalli, Rayna; Mann, Andrew W.; Agüeros, Marcel A. +8 more
The evolution of magnetism in late-type dwarfs remains murky, as we can only weakly predict levels of activity for M dwarfs of a given mass and age. We report results from our spectroscopic survey of M dwarfs in the Southern Continuous Viewing Zone (CVZ) of the Transiting Exoplanet Survey Satellite (TESS). As the TESS CVZs overlap with those of th…
Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst
Altamirano, D.; Bailyn, C. D.; Özbey Arabacı, M. +3 more
We present results from quasi-simultaneous multiwavelength observations of the Galactic black hole X-ray transient MAXI J1820+070 during the decay of the 2018 outburst and its entire subsequent mini-outburst in March 2019. We fit the X-ray spectra with phenomenological and Comptonizaton models and discuss the X-ray spectral evolution in comparison…
The Early History of Heliospheric Science and the Spacecraft That Made It Possible
Krimigis, S. M.; Möbius, E.; Richardson, J. D. +8 more
Our understanding of the interaction of the large-scale heliosphere with the local interstellar medium (LISM) has undergone a profound change since the very earliest analyses of the problem. In part, the revisions have been a consequence of ever-improving and widening observational results, especially those that identified the entrance of interste…
Nine Bright γ Doradus Variables Discovered with Ground-based Photometry
Henry, Gregory W.; Williamson, Michael H.; Fekel, Francis C.
We have used precise photometric and high-dispersion spectroscopic observations to study nine candidate γ Doradus (γ Dor) stars, identified as optically variable comparison stars in our photometric studies of Sun-like stars. In this paper, we confirm these nine candidates as new γ Dor variables. All exhibit sinusoidal variability with amplitudes b…