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High-resolution Chemical Abundances of the Nyx Stream
Ji, Alexander P.; Lisanti, Mariangela; Necib, Lina +5 more
Nyx is a nearby, prograde, and high-eccentricity stellar stream physically contained in the thick disk, but its origin is unknown. Nyx could be the remnant of a disrupted dwarf galaxy, in which case the associated dark matter substructure could affect terrestrial dark matter direct-detection experiments. Alternatively, Nyx could be a signature of …
SPICE point spread function correction: General framework and capability demonstration
Peter, H.; Auchère, F.; Fludra, A. +4 more
We present a new method of removing point spread function (PSF) artifacts and improving the resolution of multidimensional data sources, including imagers and spectrographs. Rather than deconvolution, which is translationally invariant, the method we present is based on sparse matrix solvers. This allows it to be applied to spatially varying PSFs …
Evolution of grain size distribution with enhanced abundance of small carbonaceous grains in galactic environments
Hirashita, Hiroyuki
We propose an updated dust evolution model that focuses on the grain size distribution in a galaxy. We treat the galaxy as a one-zone object and include five main processes (stellar dust production, dust destruction in supernova shocks, grain growth by accretion and coagulation, and grain disruption by shattering). In this paper, we improve the pr…
Hiding Dust around ϵ Eridani
Gáspár, András; Wolff, Schuyler Grace; Ygouf, Marie +2 more
With a Jupiter-like exoplanet and a debris disk with both asteroid and Kuiper Belt analogs, ϵ Eridani has a fascinating resemblance to our expectations for a young solar system. We present a deep Hubble Space Telescope/Space Telescope Imaging Spectrograph coronographic data set using eight orbit visits and the point-spread function calibrator δ Er…
The Structure of Coronal Mass Ejections Recorded by the K-Coronagraph at Mauna Loa Solar Observatory
Chen, Yao; Xia, Lidong; Li, Leping +3 more
Previous survey studies reported that coronal mass ejections (CMEs) can exhibit various structures in white-light coronagraphs, and ~30% of them have the typical three-part feature in the high corona (e.g., 2-6 R ⊙), which has been taken as the prototypical structure of CMEs. It is widely accepted that CMEs result from eruption of magne…
The Ultraviolet to Mid-infrared Extinction Law of the Taurus Molecular Cloud Based on the Gaia DR3, GALEX, APASS, Pan-STARRS1, 2MASS, and WISE Surveys
Wang, Shu; Chen, Xiaodian; Li, Ling +1 more
Interstellar-dust extinction law is essential for interpreting observations. In this work, we investigate the ultraviolet (UV)-mid-infrared (IR) extinction law of the Taurus molecular cloud and its possible variations. We select 504,988 dwarf stars (4200 K ≤ T eff ≤ 8000 K) and 4757 giant stars (4200 K ≤ T eff ≤ 5200 K) based…
V618 Sgr: galactic eclipsing symbiotic nova detected in repeated outbursts
Merc, J.; Gális, R.; Garde, O. +9 more
V618 Sgr was previously classified as an R CrB-type variable and later as a possible symbiotic star. Our study aims to analyse the nature of this target, which is currently undergoing significant brightening in properties similar to those of known symbiotic novae. We analyse literature information, photometric observations, and 35 new optical spec…
Identification of late-type Class I stars using Gaia DR3 Apsis parameters
Messineo, Maria
Aims: We examined the Gaia DR3 GSP-Phot and GSP-Spec parameters of known K- and M-type stars of Class I luminosity to make a comparison with the parameters collected from the literature to assess their accuracy and their potential in setting stellar classifications of intrinsically bright late-types that have been unknown thus far. Gaia DR3 G…
A revised age greater than 50 Myr for the young cluster IC 4665
Jeffries, R. D.; Jackson, R. J.; Binks, A. S.
IC 4665 is one of only a dozen young open clusters with a 'lithium depletion boundary' (LDB) age. Using an astrometrically and spectroscopically filtered sample of cluster members, we show that both the positions of its low-mass stars in Gaia absolute colour-magnitude diagrams and the lithium depletion seen among its K- and early M-stars are disco…
Study of oxygen-rich post-AGB stars in the Milky Way as a means to explain the production of silicates among evolved stars
Dell'Agli, F.; Ventura, P.; Marchetti, T. +4 more
Context. The study of post-asymptotic giant branch (post-AGB) stars is a valuable tool in improving our understanding of poorly known aspects of the evolution of the stars throughout the asymptotic giant branch (AGB). This can be done thanks to the availability of more accurate determinations of their surface chemical composition and the peculiar …