Search Publications
Clustering Properties of Intermediate and High-mass Young Stellar Objects
Ribas, Álvaro; Kuhn, Michael A.; Oudmaijer, René D. +6 more
We have selected 337 intermediate- and high-mass young stellar objects (YSOs; 1.5-20 M ⊙) well-characterized with spectroscopy. By means of the clustering algorithm HDBSCAN, we study their clustering and association properties in the Gaia DR3 catalog as a function of stellar mass. We find that the lower-mass YSOs (1.5-4 M ⊙) …
Coronal line forest AGN - II. Analysis of the spectral energy distribution
Riffel, R.; Rodríguez-Ardila, A.; Panda, S. +3 more
Coronal-Line Forest Active Galactic Nuclei (CLiF AGN) are characterized by strong, high-ionization lines, which are in contrast to what is found in typical AGNs. Here, we carry out an infrared analysis aimed at understanding the spectral energy distribution (SED) of six sources from this group. In this work, the properties of the dusty torus for t…
Probing the global dust properties and cluster formation potential of the giant molecular cloud G148.24+00.41
Chen, W. P.; Marton, G.; Zavagno, A. +8 more
Clouds more massive than about 105 M⊙ are potential sites of massive cluster formation. Studying the properties of such clouds in the early stages of their evolution offers an opportunity to test various cluster formation processes. We make use of CO, Herschel, and UKIDSS observations to study one such cloud, G148.24+00.41. O…
The study on transiting systems HAT-P-13, HAT-P-16, and WASP-32 through combining ground-based and TESS photometry
Schmitt, J. H. M. M.; Wang, X.; Perdelwitz, V. +4 more
High-precision transit photometry supplies ideal opportunities for detecting new exoplanets and characterizing their physical properties, which usually encode valuable information for unveiling the planetary structure, atmosphere, and dynamical history. We present revised properties of three transiting systems (i.e. HAT-P-13, HAT-P-16, and WASP-32…
Young nearby open clusters and their luminosity functions
Béjar, V. J. S.; Martín, E. L.; Lodieu, N. +3 more
Context. Open clusters are groups of coeval stars sharing properties such as distance and metallicity, and they are key to understanding stellar evolution.
Aims: Our main goal is to study the evolution of open clusters with a special focus on the universality of the luminosity function.
Methods: We applied an upgraded version of the conv…
The Cassiopeia Filament: A Blown Spur of the Local Arm
Fang, Min; Chen, Zhiwei; Zhang, Shiyu +12 more
We present wide-field and high-sensitivity CO(1-0) molecular line observations toward the Cassiopeia region, using the 13.7 m millimeter telescope of the Purple Mountain Observatory. The CO observations reveal a large-scale highly filamentary molecular cloud within the Galactic region of 132.°0 ≥ l ≥ 122.°0 and -1.°0 ≤ b ≤ 3.°0 and the velocity ra…
Properties of Star Formation of the Large Magellanic Cloud As Probed by Young Stellar Objects
Tachihara, Kengo; Kaneda, Hidehiro; Fukui, Yasuo +2 more
We perform a systematic study of the evolutionary stages and stellar masses of young stellar objects (YSOs) in the Large Magellanic Cloud (LMC) to investigate the properties of star formation in the galaxy. There are 4825 sources in our YSO sample, which are constructed by combining the previous studies identifying YSOs in the LMC. Spectral energy…
Kinematics of High-Velocity Stars within 300 pc from the Sun according to Gaia DR3
Vereshchagin, S. V.; Chupina, N. V.; Tutukov, A. V.
The kinematics of stars from the solar neighborhood with a radius of 300 pc has been studied using the Gaia DR3 data. Our sample includes n = 970 171 stars—AG300 (A—ensemble, G—Gaia, 300—radius of the studied zone in pc). The kinematics of these stars reflects the morphology of the main stellar populations of the Galaxy: the stellar disk, bulge, h…
Solar Activities Associated with 3He-rich Solar Energetic Particle Events Observed by Solar Orbiter
Nitta, Nariaki V.; Ho, George C.; Mason, Glenn M. +5 more
A series of 3He-rich solar energetic particle (SEP) events was observed by Solar Orbiter in May 2021 at a radial distance of 0.95 AU. An isolated active region AR 12824 was likely the ultimate source of these SEP events. The period of the enhanced flux of 3He was also a period of frequent type III bursts in the decametric-hectometric range, confir…
Optical and Near-infrared Observations of the Distant but Bright "New Year's Burst" GRB 220101A
Fynbo, Johan P. U.; Gao, Xing; Xu, Dong +26 more
High-redshift gamma-ray bursts (GRBs) are useful to probe the early Universe, but only a few candidates have been detected so far. Here, we report the optical and near-infrared observations of the afterglow of a relatively high-redshift event GRB 220101A, which was triggered on New Year's Day of 2022, and therefore referred to as the "New Year's b…