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Calibrating the Color–Magnitude Relation of M Giants by Using Open Clusters
Hao, C. J.; Xu, Y.; Lin, Z. H. +8 more
M giants, with their distinctive properties such as high luminosity, serve as excellent indicators for mapping the structure of the Milky Way. The distance to distant M giants can be determined by using the color–magnitude relation (CMR), which is derived from color–magnitude diagrams of specific systems in previous studies. In this work, we aimed…
Chemodynamic evolution of Sun-like stars in nearby moving groups
Murphy, Michael T.; Liu, Fan; Flynn, Chris +1 more
Sun-like stars are well represented in the solar neighbourhood but are currently underutilized, with many studies of chemical and kinematic evolution focusing on red giants (which can be observed further away) or turn-off stars (which have well-measured ages). Recent surveys (e.g. GALAH) provide spectra for large numbers of nearby Sun-like stars, …
Geomorphological study of the gullies in Penticton Crater, Mars: Classification and origin
Natarajan, Varsha; K N, Kusuma; Nandana, D. Lekshmi
Penticton crater, a southern hemisphere mid-latitude crater on Mars, is covered with features that are typical examples of Martian gullies that resemble the terrestrial gullies on Earth. We studied the gullies present in the Penticton crater, classified them and interpreted their formation mechanism using a remote sensing approach. A wide variety …
A study on the evolutionary period changes of short-period type II cepheids
Pastukhova, Elena N.; Yacob, Alemiye Mamo; Berdinkov, Leonid N.
We investigate the period changes of 13 short-period Type II Cepheids using the O-C method over a century-long data baseline. The O-C diagrams for these stars exhibit a parabolic trend, indicating both increasing and decreasing period changes over time. These observed period changes are consistent with recent theoretical models based on horizontal…
Short-wave fadeout on mars: Radio absorption in the dayside martian ionosphere enhanced by solar flares
Lester, M.; Sánchez-Cano, B.; Harada, Y. +1 more
Solar flares can cause radio absorption in the D region of the Earth's ionosphere and consequently interrupt high-frequency radio communication systems, also known as short-wave fadeout or the Dellinger effect. We present an analogous radio absorption event observed at Mars during a solar flare. In this event, the Mars Express Mars Advanced Radar …
How inclusion of binaries affects the fitting of giant branches and determination of fundamental parameters of star clusters
Li, Zhongmu; Zhou, Yun
Open clusters (OCs) play an important role in the study of star formation and the structural evolution of the Milky Way. This paper fits the color-magnitude diagrams (CMDs) of 17 OCs using a tool called Powerful CMD, with the aim of studying the effect of inclusion of binary stars on the fitting of cluster CMDs with clear giant branches. The fitti…
Tidal tails of nearby open clusters: I. Mapping with Gaia DR3
Risbud, Dhanraj; Jadhav, Vikrant V.; Kroupa, Pavel
Context. Tidal tails of open clusters are the result of stellar evaporation from the cluster through the Galactic potential and internal dynamics. With the recent availability of high-precision data, tidal tails are being detected for most of the nearby open clusters. Aims. We identify the tidal tail members for all open clusters within a distance…
The Orbits of Uranus, Its Satellites and Rings, the Gravity Field of the Uranian System, and the Orientation of the Poles of Uranus and Its Satellites
Jacobson, Robert A.; Park, Ryan S.
R. A. Jacobson determined the orbits of the Uranian satellites, the masses of Uranus and its satellites, and the orientation of the pole of Uranus from Earth-based astrometry, Earth-based ring occultations, and observations acquired with the Voyager 2 spacecraft. Subsequent to that publication, several observers obtained new astrometry, and some o…
Characterizing Stellar and Gas Properties in NGC 628: Spatial Distributions, Radial Gradients, and Resolved Scaling Relations
Kong, Xu; Esamdin, Ali; Zou, Hu +8 more
Building on our previous research involving multiwavelength data from UV to IR, we employ spectroscopic observations of ionized gas, as well as neutral hydrogen gas obtained from the Five-hundred Meter Aperture Spherical Telescope (FAST), to explore the intrinsic processes of star formation and chemical enrichment within NGC 628. Our analysis focu…
COSMIC-S: A Photometric Catalog of Observed Stars in the Small Magellanic Cloud
Franco, Antonio; Nucita, Achille A.; De Paolis, Francesco +1 more
The Dark Energy Camera (DECam) is a wide-field instrument mounted on the 4 m V. Blanco Telescope (Cerro Tololo Inter-American Observatory). Its impressive technical characteristics make it one of the most suitable ground-based telescopes for the production of accurate stellar photometry, even toward crowded regions such as the Magellanic Clouds. W…