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Goodness-of-fit test for isochrone fitting in the Gaia era. Statistical assessment of the error distribution
Valle, G.; Dell'Omodarme, M.; Tognelli, E.
Context. The increasing precision in observational data made available by recent surveys means that the reliability of stellar models can be tested. For this purpose, a firm theoretical basis is crucial for evaluating the agreement of the data and theoretical predictions. Aims This paper presents a rigorous derivation of a goodness-of-fit statisti…
Ionospheric Ion Acceleration and Transport
André, Mats; Yau, Andrew W.; Abe, Takumi +2 more
Photometric analysis of three totally eclipsing W UMa stars with increasing periods: TYC 3700-1384-1, V1511 Her, and V1179 Her
Broens, Eric
The first multicolour light-curve models and period studies for the totally eclipsing W UMa stars TYC 3700-1384-1, V1511 Her, and V1179 Her are presented. All three stars are A-subtype W UMa stars of spectral type F. The light-curve solutions show that TYC 3700-1384-1 has a moderately low mass ratio of q = 0.182 ± 0.001 and a degree of overcontact…
Double trouble: Gaia reveals (proto)planetary systems that may experience more than one dense star-forming environment
Parker, Richard J.; Schoettler, Christina
Planetary systems appear to form contemporaneously around young stars within young star-forming regions. Within these environments, the chances of survival, as well as the long-term evolution of these systems, are influenced by factors such as dynamical interactions with other stars and photoevaporation from massive stars. These interactions can a…
RR Lyrae Stars in Stellar Streams with Gaia: The Escapers
Grebel, Eva K.; Simunovic, Mirko; Abbas, Mohamad
We attempt to identify RR Lyrae (RRL) stars in stellar streams that might have escaped from seven globular clusters (GCs) based on proper motions, distances, color-magnitude diagrams, and other properties extracted from the Gaia Early Data Release 3 (EDR3) database. Specifically, we cross-match two large RRL stars catalogs (from Gaia DR2 and Catal…
Properties of Plasmoids Observed in Saturn's Dayside and Nightside Magnetodisc
Coates, A. J.; Wei, Y.; Ye, S. -Y. +7 more
Plasmoid is a key structure for transferring magnetic flux and plasma in planetary magnetospheres. At Earth, plasmoids are key media which transfer energy and mass in the "Dungey Cycle." For giant planets, plasmoids are primarily generated by the dynamic processes associated with "Vasyliunas cycle." It is generally believed that planetary magnetot…
Variations of Peak He/H Ratios in Solar Energetic (E > 4 MeV) Particle Events and Comparisons with Solar Wind He/H Ratios
Brown, D.; Kahler, S. W.
We determine solar energetic particle (SEP) event He/H peak intensity ratios AHe observed in the four energy channels of the SOHO EPHIN detector covering 4-53 MeV nuc-1. Those SEP AHe values range over two orders of magnitude for 43 large western hemisphere SEP events through the period 1997-2017. AHe of…
Fe XII and Fe XIII Line Widths in the Polar Off-limb Solar Corona up to 1.5 R⊙
Landi, Enrico; Zhu, Yingjie; Szente, Judit
The nonthermal broadening of spectral lines formed in the solar corona is often used to seek evidence of Alfvén waves propagating in the corona. To have a better understanding of the variation of line widths at different altitudes, we measured the line widths of the strong Fe XII 192.4, 193.5, and 195.1 Å and Fe XIII 202.0 Å in an off-limb souther…
Bright single-mode RR Lyrae stars: Matching Gaia EDR3 with pulsation and evolutionary models
Kovacs, Geza; Karamiqucham, Behrooz
We combine observed metallicity, optical, and infrared magnitudes with evolutionary and pulsation models to derive average luminosities for 156 single-mode RR Lyrae stars. These luminosities are compared with those obtained from the Gaia EDR3 parallaxes and are found to be in excellent agreement with the high accuracy subsample (62 stars, with rel…
On the derivation of thermospheric temperatures from dayglow emissions on Mars
González-Galindo, Francisco; López-Valverde, Miguel Ángel; Forget, François +2 more
The Cameron bands and the UV doublet are two of the most prominent emission systems in the UV in Mars dayside. Their altitude variation has been exploited in the past to derive thermospheric temperatures from measurements obtained by the Mariner 6, 7, and 9 missions, the SPICAM instrument on board Mars Express, and the IUVS instrument on board MAV…