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The Black Hole Candidate Swift J1728.9-3613 and the Supernova Remnant G351.9-0.9
Raymond, John; Ray, Paul S.; Zoghbi, Abderahmen +12 more
A number of neutron stars have been observed within the remnants of the core-collapse supernova explosions that created them. In contrast, black holes are not yet clearly associated with supernova remnants (SNRs). Indeed, some observations suggest that black holes are "born in the dark," i.e., without a supernova explosion. Herein, we present a mu…
AutoSourceID-FeatureExtractor. Optical image analysis using a two-step mean variance estimation network for feature estimation and uncertainty characterisation
Groot, P. J.; Vreeswijk, P.; Nelemans, G. +9 more
Aims: In astronomy, machine learning has been successful in various tasks such as source localisation, classification, anomaly detection, and segmentation. However, feature regression remains an area with room for improvement. We aim to design a network that can accurately estimate sources' features and their uncertainties from single-band im…
A Catalog of New Slowly Pulsating B-type Stars
Shi, Xiang-dong; Qian, Sheng-bang; Zhu, Li-ying +1 more
This paper reports the discovery of new slowly pulsating B-type stars. Based on the photometric, spectral, and astrometric data of the TESS, LAMOST, and Gaia surveys, we have found 286 new slowly pulsating B-type (SPB) stars and 21 candidates. Among these, 20 are Be stars or candidates with emission-line profiles. It is shown that these SPB stars …
X-ray emission from Ae/Be Herbig stars due to disc-stellar magnetosphere interaction
Lyutikov, Maxim; Ryspaeva, Elizaveta; Kholtygin, Alexander
We reanalyse archival X-ray data of 16 Ae/Be Herbig stars obtained by the XMM-Newton and Chandra satellites. Stellar X-ray spectra in the energy range 0.2-8 keV were fitted with the use of APEC and MEKAL hot plasma emission models, and with models with an additional power-law component. We find that for Herbig stars, the dependence of the unabsorb…
Multiple Rings and Asymmetric Structures in the Disk of SR 21
Dong, Ruobing; Tamura, Motohide; Liu, Hauyu Baobab +9 more
Crescent-like asymmetric dust structures discovered in protoplanetary disks indicate dust aggregations. Thus, researching these structures helps us understand the planet formation process. Here we analyze ALMA data of the protoplanetary disk around the T-Tauri star SR 21, which has asymmetric structures that were detected in previous submillimeter…
NAROO program. Precovery observations of potentially hazardous asteroids
Hestroffer, D.; Desmars, J.; Robert, V. +1 more
Context. The New Astrometric Reduction of Old Observations (NAROO) program is dedicated to the measurement of astrophotographic plates and the analysis of old observations for scientific purposes. One of the objectives of the NAROO program is to provide accurate positional measurements of small Solar System bodies in order to improve our knowledge…
Field blue straggler stars: discovery of white dwarf companions to blue metal-poor stars using UVIT/AstroSat
Subramaniam, Annapurni; Panthi, Anju; Vaidya, Kaushar +4 more
Blue metal-poor (BMP) stars are the main-sequence stars that appear bluer and more luminous than normal turn-off stars of metal-poor globular clusters. They are believed to be either field blue straggler stars (FBSS) formed via post-mass transfer mechanism or accreted from dwarf satellite galaxies of the Milky Way. A significant fraction of BMP st…
Everything that glitters is not gold: V1315 Cas is not a dormant black hole
Guenther, E. W.; Shenar, T.; Boffin, H. M. J. +11 more
The quest for quiet or dormant black holes has been ongoing since several decades. Ellipsoidal variables possibly indicate the existence of a very high-mass invisible companion and are thought to be one of the best ways to find such dormant black holes. This, however, is not a panacea as we show here with one example. We indeed report the discover…
The Initial Mass Function and Other Stellar Properties Across the Core of the Hydra I Cluster
Feldmeier-Krause, A.; Freedman, W. L.; Lonoce, Ilaria
The Hydra I cluster offers an excellent opportunity to study and compare the relic old stellar populations in the core of its two brightest galaxies. In addition, the differing kinematics of the two galaxies allows a test of the local validity of general scaling relations. In this work, we present a direct comparison employing full spectral fittin…
Planar Magnetic Structures Downstream of Coronal Mass Ejection-driven Shocks in the Inner Heliosphere
Xu, Qi; Feng, Xueshang; Shen, Zhenning +7 more
Planar magnetic structures (PMSs), characterized by interplanetary magnetic field vectors remaining parallel to a specific plane, are commonly observed in the solar wind, especially in the sheath region of interplanetary coronal mass ejections (ICMEs). In this study, PMS events in the 2 hr regions downstream of ICME-driven shocks were investigated…