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Sifting the debris: Patterns in the SNR population with unsupervised ML methods
Umana, G.; Sciacca, E.; Loru, S. +13 more
Context. Supernova remnants (SNRs) carry vast amounts of mechanical and radiative energy that heavily influence the structural, dynamical, and chemical evolution of galaxies. To this day, more than 300 SNRs have been discovered in the Milky Way, exhibiting a wide variety of observational features. However, existing classification schemes are mainl…
Recurrent Coronal Mass Ejections and Their Geomagnetic Storms Association on 2012 January 19: Solar Surface to Upper Earth's Atmosphere Analyses
Minta, F. N.; Hassanin, A.; Shimeis, Amira +1 more
In this study, we have conducted an analysis of space weather disruptions that occurred on 19 January 2012. Our analysis identified three coronal mass ejections (CMEs), CME1, CME2, and CME3—which were ejected at 09:48:05 universal time (UT), 14:36:05 UT, and 16:12:06 UT, respectively. Nonrecurrent disturbances in space weather, such as geomagnetic…
Variable Stars in the 50BiN Open Cluster Survey. III. NGC 884
Deng, Li-Cai; Wang, Kun; Zhang, Xiao-Bin +5 more
Open clusters are the basic building blocks that serve as a laboratory for the study of young stellar populations in the Milky Way. Variable stars in open clusters provide a unique way to accurately probe the internal structure, temporal and dynamical evolutionary stages of individual stars and the host cluster. The most powerful tool for such stu…
The Temperature and Density of a Solar Flare Kernel Measured from Extreme-ultraviolet Lines of O IV
Young, Peter R.
Previously unexplored diagnostics of O IV in the extreme-ultraviolet region 260–280 Å are used to derive a temperature and density for a solar flare kernel observed on 2012 March 9 with the Extreme-ultraviolet Imaging Spectrometer on the Hinode satellite. Seven lines from the 2s2p 2–2s2p3s transition array between 271.99 and 272.31 Å ar…
The Destiny of the Open Cluster NGC 6530: Past and Future
Li, Lu; Shao, Zhengyi; Jia, Delong +1 more
Studying the structures of open clusters is crucial for understanding stellar evolution and galactic dynamics. Based on Gaia DR3 data, we apply the hierarchical clustering algorithm to the young open cluster NGC 6530 and group its members into five substructures. By linear tracing with the kinematic information of their members, we find that sub 1…
Spectroscopic Study of Late-type Emission-line Stars Using the Data from LAMOST DR6
Mathew, Blesson; Kartha, Sreeja S.; Shridharan, B. +5 more
Low-mass emission-line stars belong to various evolutionary stages, from pre-main-sequence young stars to evolved stars. In this work, we present a catalog of late-type (F0 to M9) emission-line stars from the LAMOST Data Release 6. Using the scipy package, we created a Python code that finds the emission peak at Hα in all late-type stellar spectra…
Unveiling compact planetary nebulae: Broad-band survey analysis and LAMOST confirmation
Gutiérrez-Soto, L. A.; Weidmann, W. A.; Faifer, F. R. +1 more
Planetary nebulae (PNe) are pivotal for advancing our knowledge of stellar evolution and galactic chemical enrichment. Recent progress in surveys and data analysis has revolutionized PN research, leading to the discovery of new objects and deeper insights into their properties. We have devised a novel photometric selection method, integrating GAIA…
A novel analysis of contamination in Lyman-break galaxy samples at z 6-8: spatial correlation with intermediate-redshift galaxies at z 1.3-2
Trenti, Michele; Leethochawalit, Nicha; Metha, Benjamin +1 more
Potential contamination from low/intermediate-redshift galaxies, such as objects with a prominent Balmer break, affects the photometric selection of high-redshift galaxies through identification of a Lyman break. Traditionally, contamination is estimated from spectroscopic follow-up and/or simulations. Here, we introduce a novel approach to estima…
A Comparative Study of Two Contrasting Cosmic-Ray Events Caused by Solar Eruptions from NOAA AR 12673 in 2017 September
Zhang, Shuang Nan; Zhang, Ping; Yu, Xiao Xia +3 more
Two major solar eruptions on AR 12673 produced a Forbush decrease (FD) event (reduction of cosmic rays) on 2017 September 8 and ground-level enhancement (GLE; enhancement of cosmic rays) on 2017 September 10. The occurrence of two contrasting cosmic-ray events within 2 days that are associated with two similar X-class solar flares (X9.3 and X8.2) …
Stellar Occultations in the Era of Data Mining and Modern Regression Models: Using Gaussian Processes to Analyze Light Curves and Improve Predictions
Person, Michael J.; Levine, Stephen E.; Krabbe, Alfred +3 more
Gaussian process (GP) regression is a nonparametric Bayesian approach that has been used successfully in various astronomical domains, especially in time-domain astronomy. The most common applications are the smoothing of data for interpolation and the detection of periodicities. The ability to create unbiased data-driven models without a predefin…