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12C/13C ratio and CNO abundances in the classical very old metal-poor dwarf HD 140283
Spite, M.; Barbuy, B.; Spite, F.
Context. The isotope abundances provide powerful diagnostics of the chemical enrichment in our Galaxy. The star HD 140283 is one of the best-studied very metal-poor dwarf stars. It is very old, and the chemical abundance in this star is a good witness of the chemical composition of the matter in the early Galaxy.
Aims: The aim of this work is…
Multifrequency high spectral resolution observations of HCN toward the circumstellar envelope of Y Canum Venaticorum
Santander-García, M.; Cernicharo, J.; Greathouse, T. K. +7 more
High spectral resolution observations toward the low mass-loss rate C-rich, J-type asymptotic giant branch (AGB) star Y CVn were carried out at 7.5, 13.1, and 14.0 µm with the Echelon-cross-echelle Spectrograph mounted on the Stratospheric Observatory for Infrared Astronomy and the Texas Echelon-cross-echelle Spectrograph on the Infrared Tel…
ALMA observations of the early stages of substellar formation in the Lupus 1 and 3 molecular clouds
Hales, A.; de Gregorio-Monsalvo, I.; Bayo, A. +10 more
Context. The dominant mechanism leading to the formation of brown dwarfs (BDs) remains uncertain. While the census of Class II analogs in the substellar domain continues to grow, the most direct keys to formation, which are obtained from younger objects (pre-BD cores and proto-BDs), are limited by the very low number statistics available.
Aim…
Multi-wavelength VLTI study of the puffed-up inner rim of a circumbinary disc
Min, M.; Van Winckel, H.; Kamath, D. +3 more
Context. The presence of stable, compact circumbinary discs of gas and dust around post-asymptotic giant branch (post-AGB) binary systems has been well established. We focus on one such system, IRAS 08544−4431.
Aims: We present an interferometric multi-wavelength analysis of the circumstellar environment of IRAS 08544−4431. The aim is to cons…
A Multi-instrument Study of the 2018 Hard-state-only Outburst of H1743-322
Stiele, H.; Kong, A. K. H.
Distinct changes of the spectral and variability properties observed in black hole transients during a bright outburst deliver insight into the evolution of the accretion flow and accretion geometry. We investigated NICER and Swift monitoring observations of H 1743-322 during its 2018 outburst as well as NuSTAR and XMM-Newton data. The observed ha…
The Encounter of the Parker Solar Probe and a Comet-like Object Near the Sun: Model Predictions and Measurements
Zong, Qiugang; He, Jiansen; Ip, Wing-Huen +15 more
The Parker Solar Probe (PSP) aims to explore the nascent solar wind close to the Sun. Meanwhile, PSP is also expected to encounter small objects like comets and asteroids. In this work, we survey the ephemerides to find the chance of a recent encounter and then model the interaction between released dusty plasmas and solar wind plasmas. On 2019 Se…
Winds in the Lower Cloud Level on the Nightside of Venus from VIRTIS-M (Venus Express) 1.74 µm Images
Khatuntsev, Igor V.; Patsaeva, Marina V.; Zasova, Ludmila V. +2 more
ALMA Observation of the Protoplanetary Disk around WW Cha: Faint Double-peaked Ring and Asymmetric Structure
Dong, Ruobing; Kataoka, Akimasa; Takami, Michihiro +13 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations of dust continuum emission of the disk around WW Cha. The dust continuum image shows a smooth disk structure with a faint (low-contrast) dust ring, extending from ∼40 au to ∼70 au, not accompanied by any gap. We constructed the simple model to fit the visibility of …
Spatially-resolved stellar population properties of the M51-NGC 5195 system from multi-wavelength photometric data
Kong, Xu; Zou, Hu; Lin, Lin +5 more
Using multi-band photometric images of M51 and its companion NGC 5195 from ultraviolet to optical and infrared, we investigate spatially resolved stellar population properties of this interacting system with stellar population synthesis models. The observed infrared excess (IRX) is used to constrain dust extinction. Stellar mass is also inferred f…
A Search for Cloud Cores Affected by Shocked Carbon Chain Chemistry in L1251
Kim, Kee-Tae; Xu, Y.; Li, D. +26 more
We searched for shocked carbon chain chemistry (SCCC) sources with C3S abundances surpassing those of HC5N toward the dark cloud L1251, using the Effelsberg telescope at the K band (18-26 GHz). L1251-1 and L1251-3 are identified as the most promising SCCC sources. The two sources harbor young stellar objects. We conducted map…