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AGB and Post-AGB Stars versus Planetary Nebulae and Young Stellar Objects: Properties in Visual and IR Bands
Suh, Kyung-Won
We investigate the properties of AGB and post-AGB (PAGB) stars, planetary nebulae, and young stellar objects (YSOs) in our Galaxy through an analysis of observational data covering visual and infrared (IR) wavelengths. Utilizing datasets from IRAS, 2MASS, AllWISE, Gaia DR3, and the SIMBAD object database, we perform an in-depth comparison between …
LCGCT: A light curve generator in customisable-time-bin based on time-series database
Xu, Y.; Cui, C.; Fan, D. +1 more
In the era of time-domain astronomy, scientists often need to generate light curves with varying time-bin. However, an increase in time resolution typically leads to a substantial increase in data transmission. To enhance the data processing efficiency in time-domain astronomy, we propose a novel time-series data model for storing time-series obse…
Thermophysical arguments against basal melting in the south polar region of Mars
Ojha, Lujendra; Buffo, Jacob; Journaux, Baptiste
The south polar layered deposits (SPLD) on Mars is primarily composed of H2O ice, with smaller quantities of impurities such as CO2 ice and dust. The presence of these impurities can affect the thermal structure of the SPLD, increasing the basal temperature and potentially leading to basal melting. Recently, bright basal refl…
Multiple-scale gas infall through gravity torques on Milky Way twins
Combes, Françoise; da Silva, Patrícia
One of the main problems raised by the feeding of super-massive black holes (SMBHs) at the centres of galaxies is the huge angular momentum of the circumnuclear gas and of the gas reservoir in the galaxy disk. Because viscous torques are not efficient at kiloparsec or 100 pc scales, the angular momentum must be exchanged through gravity torques th…
The stellar 'Snake' - II. The mass function
Qiu, Dan; Bird, Sarah A.; Yang, Xiang-Ming +8 more
We present a comprehensive investigation on the mass function (MF) of a snake-like stellar structure in the solar neighbourhood, building on our previous discovery. To ensure the reliability of the data, we reselect the member stars of the Stellar 'Snake' in the latest Gaia Data Release 3 using the same approach as the initial series of articles. …
A3COSMOS: Dissecting the gas content of star-forming galaxies across the main sequence at 1.2 ≤ z < 1.6
Schinnerer, Eva; Liu, Daizhong; Bertoldi, Frank +5 more
Aims: We aim to understand the physical mechanisms that drive star formation in a sample of mass-complete (>109.5 M⊙) star-forming galaxies (SFGs) at 1.2 ≤ ɀ < 1.6.
Methods: We selected SFGs from the COSMOS2020 catalog and applied a uυ-domain stacking analysis to their archival Atacama Large Millimeter/submill…
An X-ray flaring event and a variable soft X-ray excess in the Seyfert LCRS B040659.9–385922 as detected with eROSITA
Reichart, D. E.; Gromadzki, M.; Liu, Z. +13 more
Context. Extreme continuum variability in extragalactic nuclear sources can indicate extreme changes in accretion flows onto supermassive black holes. Aims. We explore the multiwavelength nature of a continuum flare in the Seyfert LCRS B040659.9‑385922. The all-sky X-ray surveys conducted by the Spectrum Roentgen Gamma (SRG)/extended ROentgen Surv…
Runaway BN supergiant star HD 93840: Progenitor of an imminent core-collapse supernova above the Galactic plane
Butler, K.; Weßmayer, D.; Przybilla, N. +1 more
We present a quantitative spectral analysis of the extreme nitrogen-enhanced supergiant HD 93840 (BN1 Ib) at an intermediate galactic latitude. Based on an optical high-resolution spectrum and complementary ultraviolet and infrared (spectro-)photometry, in addition to Gaia data, we carried out a full characterisation of the star's properties. We u…
Toroidal modified Miller-Turner CME model in EUHFORIA: Validation and comparison with flux rope and spheromak
Magdalenić, J.; Poedts, S.; Maharana, A. +1 more
Context. Rising concerns about the impact of space-weather-related disruptions demand modelling and reliable forecasting of coronal mass ejection (CME) impacts. Aims. In this study, we demonstrate the application of the modified Miller-Turner (mMT) model implemented within EUropean Heliospheric FORecasting Information Asset (EUHFORIA) in forecasti…
First deep search of tidal tails in the Milky Way globular cluster NGC 6362
Piatti, Andrés E.
I present results of the analysis of a set of images obtained in the field of the Milky Way globular cluster NGC 6362 using the Dark Energy Camera, which is mounted in the 4.0 m Victor Blanco telescope of the Cerro-Tololo Interamerican Observatory. The cluster was selected as a science case for deep high-quality photometry because of the controver…