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A Refined Astrometric Approach Based on the Precision Premium and its Application to the Jupiter's Satellite Himalia
Li, D.; Lin, F. R.; Peng, Q. Y. +1 more
Since the advent of Gaia catalog, positional precision of a ground-based telescope can be greatly improved by correction of more subtle errors, including positional biases induced by atmospheric turbulence, and some instrumental factors such as geometric distortion and the charge transfer efficiency. In our previous work, the correlation of positi…
The Blue Horizontal-branch Stars from the LAMOST Survey: Atmospheric Parameters
Shi, Jianrong; Huang, Yang; Liu, Chao +4 more
Blue horizontal-branch (BHB) stars are crucial for studying the structure of the Galactic halo. Accurate atmospheric parameters of BHB stars are essential for investigating the formation and evolution of the Galaxy. In this work, a data-driven technique named Stellar Label Machine (SLAM) is used to estimate the atmospheric parameters of Large Sky …
On the Existence of Long-period Decayless Oscillations in Short Active Region Loops
Van Doorsselaere, Tom; Lim, Daye; Berghmans, David +5 more
Decayless kink oscillations, characterized by their lack of decay in amplitude, have been detected in coronal loops of varying scales in active regions, the quiet Sun, and coronal holes. Short-period (<50 s) decayless oscillations have been detected in short loops (< 50 Mm) within active regions. Nevertheless, long-period decayless oscillati…
TESS Giants Transiting Giants. VII. A Hot Saturn Orbiting an Oscillating Red Giant Star
Trifonov, Trifon; Henning, Thomas; Sing, David K. +30 more
We present the discovery of TOI-7041 b (TIC 201175570b), a hot Saturn transiting a red giant star with measurable stellar oscillations. We observe solar-like oscillations in TOI-7041 with a frequency of maximum power of
Milky Way Classical Cepheid Distances from Calibrated Infrared Period–Luminosity–Metallicity Relations
Wang, Huajian; Chen, Xiaodian
Classical Cepheids (DCEPs) serve as fundamental standard candles for measuring cosmic distances and investigating the structure and evolution of the Milky Way disk. However, accurate distance estimation faces challenges due to severe extinction, particularly toward the Galactic center. Although the Gaia Wesenheit magnitude reduces extinction effec…
ALMA detections of circumstellar disks in the giant H II region M17: Probing the intermediate- to high-mass pre-main-sequence population
Rab, C.; Kaper, L.; Hogerheijde, M. +8 more
Context. Our current understanding is that intermediate- to high-mass stars form in a way similar to low-mass stars, through disk accretion. The expected shorter formation timescales, higher accretion rates, and increasingly strong radiation fields compared to their lower-mass counterparts may lead to significantly different physical conditions th…
X-ray timing and spectral characteristics of compact symmetric objects
Stalin, C. S.; Saikia, D. J.; Paliya, Vaidehi S. +1 more
Compact Symmetric Objects (CSOs) are a distinct category of jetted active galactic nuclei whose high-energy emission is not well understood. We examined the X-ray characteristics of 17 bona fide CSOs using observations from Chandra, XMM-Newton, and NuSTAR. Among the sources with XMM-Newton observations, we found two sources, J0713+4349 and J1326+3…
Photometric Comparison of Metis and LASCO-C2 Polarized Brightness Images
Susino, Roberto; Romoli, Marco; Burtovoi, Aleksandr +15 more
The Metis coronagraph onboard Solar Orbiter and the LASCO-C2 coronagraph onboard SoHO both acquire white light polarized brightness (pB) images of the solar corona. When the Sun–Solar Orbiter distance is less than 0.85 AU, i.e., outside orbital segments around aphelia, the range of elongations covered by the fields-of-view of the two instruments o…
The S-PLUS 12-band Photometry as a Powerful Tool for Discovery and Classification: Ten Cataclysmic Variables in a Proof-of-concept Study
Mukai, Koji; Lopes de Oliveira, Raimundo; Schoenell, William +9 more
Multiband photometric surveys provide a straightforward way to discover and classify astrophysical objects systematically, enabling the study of a large number of targets at relatively low cost. Here we introduce an alternative approach to select accreting white dwarf (AWD) candidates following their spectral energy distribution, entirely supporte…
New astrometric positions for six Jovian irregular satellites using Gaia DR3 in 2016 — 2021
Vienne, A.; Lin, F. R.; Peng, Q. Y. +2 more
The Jovian system is like a miniature solar system, with the system being more than twice as massive as all the other planets combined and having many natural satellites. Its formation and early evolution had a profound influence on our knowledge of the sculpting of the architecture of the solar system. Astrometric observations are of importance, …