Search Publications
CCD UBV(RI)KC photometry and dynamics of the open cluster NGC 1513
Akkaya Oralhan, İnci; Çakmak, Hikmet; Michel, Raúl +2 more
We derive astrophysical parameters of the open cluster NGC 1513 by means of colour indices built with new CCD UBV(RI)KC photometry. Based on early-type members, the mean foreground reddening and total to selective extinction ratio are E(B - V) = 0.79 ± 0.09 mag and RV = 2.85 ± 0.05. Through the differential grid method, we de…
Multi-epoch X-ray spectral analysis of Centaurus A: Revealing new constraints on iron emission line origins
Tanimoto, Atsushi; Bamba, Aya; Hagino, Kouichi +3 more
We conduct X-ray reverberation mapping and spectral analysis of the radio galaxy Centaurus A to uncover its central structure. We compare the light curve of the hard X-ray continuum from Swift Burst Alert Telescope observations with that of the Fe K
Lithium, rotation and metallicity in the open cluster M35
Bouy, H.; Barrado, D.; Agüeros, M. A. +2 more
Context. Lithium (Li) abundance is an age indicator for G, K, and M stellar types, as its abundance decreases over time for these spectral types. However, despite all of the observational efforts made over the past few decades, the role of rotation, stellar activity, and metallicity in the depletion of Li is still unclear.
Aims: Our purpose i…
JWST/NIRSpec Observations of Brown Dwarfs in the Orion Nebula Cluster
Luhman, K. L.; Tremblin, P.; Parker, R. J. +4 more
We have used the multiobject mode of the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST) to obtain low-resolution 1–5 µm spectra of 22 brown dwarf candidates in the Orion Nebula Cluster, which were selected with archival images from the Hubble Space Telescope. One of the targets was previously classified a…
Constraining the Excitation of Molecular Gas in Two Quasar-starburst Systems at z ∼ 6
Fan, Xiaohui; Neri, Roberto; Menten, Karl M. +15 more
We present NOrthern Extended Millimeter Array observations of CO(8–7), (9–8), and (10–9) lines, as well as the underlying continuum for two far-infrared luminous quasars: SDSS J2054-0005 at z = 6.0389 and SDSS J0129-0035 at z = 5.7788. Both quasars were previously detected in CO (2–1) and (6–5) transitions, making them candidates for studying the …
Latitudinal Mapping of Chorus Waves Growth Rates Based on Multi-Spacecraft Wave and Plasma Measurements
Agapitov, O. V.; Artemyev, A.; Mourenas, D. +3 more
Whistler mode chorus waves are one of the most intense and important electromagnetic emissions in the Earth's radiation belt, where these waves are responsible for electron acceleration to relativistic energies and for energetic electron precipitation into the Earth's atmosphere. This study reports a unique multi-spacecraft observation event that …
A comprehensive study of an oscillating eclipsing Algol: Y Camelopardalis
Kahraman Aliçavuş, Filiz; Çelik, Eda
Y Camelopardalis (Y Cam) is classified as one of the oscillating eclipsing Algol (oEA) systems, which feature a $\delta$ Scuti-type pulsating component alongside mass transfer phenomena. oEA systems are invaluable for probing the evolutionary processes and internal structures of binary components, offering insights through their binary variations …
Coevolution of Giant Molecular Clouds, Filaments, and Clumps as a Function of the Dense Gas Mass Fraction
Li, Dalei; Tang, Xindi; Zhou, Jianjun +12 more
We investigate the evolutionary dynamics with archival continuum and line data of 27 giant molecular clouds (GMCs) in the Milky Way, focusing on their influence on star formation. Examining the dense gas mass fraction (DGMF) among the GMCs, we categorize them into low-DGMF (DGMF < 20%), medium-DGMF (20% < DGMF < 60%), and high-DGMF (60% &…
IS⊙IS Solar γ-Ray Measurements: Initial Observations and Calibrations
Mitchell, D. G.; McComas, D. J.; Mitchell, J. G. +13 more
High-energy neutral solar radiation in the form of γ-rays and neutrons is produced as secondary products in solar flares. The characteristics of this emission can provide key information regarding the energization of charged particles, particularly when primary particles remain trapped in the corona. The Integrated Science Investigation of the Sun…
A Multibranch Deep Neural Network for the Superresolution of Solar Magnetograms
Xu, Long; Zhao, Dong; Dou, Fengping +1 more
The existing superresolution (SR) models for solar magnetograms are mostly borrowed from the SR models for natural images. They are less effective for processing solar magnetograms with a very large dynamic range and very rich image features. In this paper, a multibranch superresolution (MBSR) model is specially designed for solar magnetograms. Fi…