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Moving Groups in the Solar Neighborhood with Gaia, APOGEE, GALAH, and LAMOST: Dynamical Effects Gather Gas and the Ensuing Star Formation Plays an Important Role in Shaping the Stellar Velocity Distributions
Zhao, Jingkun; Yoon, Suk-Jin; Liang, Xilong
With Gaia, APOGEE, GALAH, and LAMOST data, we investigate the positional, kinematic, chemical, and age properties of nine moving groups in the solar neighborhood. We find that each moving group has a distinct distribution in the velocity space in terms of its metallicity, α abundance, and age. Comparison of the moving groups with their underlying …
Once in a blue stream. Detection of recent star formation in the NGC 7241 stellar stream with MEGARA
Leaman, Ryan; Erkal, Denis; Voggel, Karina T. +23 more
Aims: In this work we study the striking case of a narrow blue stream with a possible globular cluster-like progenitor around the NGC 7241 galaxy and its foreground dwarf companion. We want to figure out if the stream was generated by tidal interaction with NGC 7241 or if it first interacted with the foreground dwarf companion and later both …
Concerning SH0ES data: discrepant W0, VI absolute magnitudes for Cepheids in the keystone galaxy NGC4258
Majaess, Daniel
SH0ES VI-band photometry for classical Cepheids in the keystone galaxy NGC4258 yield discrepant absolute magnitudes. Specifically, the 2016 and 2022 published SH0ES Cepheid data for NGC4258 exhibit a substantial offset of ΔW0, VI ≃ 0m.3. That adds to a suite of existing concerns associated with the SH
Asteroid spin and shape properties from Gaia DR3 photometry
Mignard, F.; Tanga, P.; Cellino, A. +1 more
Context. The third data release of Gaia, in June 2022, included the first large sample of sparse photometric data for more than 150 000 Solar System objects (SSOs), mainly asteroids.
Aims: The SSO photometric data can be processed to derive information on the physical properties for a large number of objects, including spin properties, surfac…
Modelling JWST mid-infrared counts: excellent consistency with models derived for IRAS, ISO, and Spitzer
Rowan-Robinson, Michael
Models derived in 2009 to fit mid-infrared (8-24 micron) source counts from the IRAS, ISO, and Spitzer missions, provide an excellent fit to deep counts with JWST, demonstrating that the evolution of dusty star-forming galaxies is well understood. The evolution of dust in galaxies at high redshifts is discussed and a simple prescription is propose…
Yellow hypergiant V509 Cas: Stable in the `yellow void'
Kolka, I.; Kasikov, A.; Aret, A. +2 more
Context. The yellow hypergiant star
Likelihood-based Jump Detection and Cosmic Ray Rejection for Detectors Read Out Up-the-ramp
Brandt, Timothy D.
This paper implements likelihood-based jump detection for detectors read out up-the-ramp, using the entire set of reads to compute likelihoods. The approach compares the χ 2 value of a fit with and without a jump for every possible jump location. I show that this approach can be substantially more sensitive than one that only uses the d…
Infrared Properties of Carbon Stars in Our Galaxy
Suh, Kyung-Won
We explore the characteristics of carbon stars within our Galaxy through a comprehensive analysis of observational data spanning visual and infrared (IR) bands. Leveraging data sets from IRAS, the Infrared Space Observatory, Akari, the Midcourse Space Experiment, the Two Micron All Sky Survey, the Wide-field Infrared Survey Explorer (WISE), Gaia D…
Sublimation of volatiles from H2O:CO2 bulk ices in the context of comet 67P/Churyumov-Gerasimenko. II. Noble gases
Wurz, P.; Altwegg, K.; Rubin, M. +6 more
Context. The ROSINA instrument on board the Rosetta spacecraft measured, among others, the outgassing of noble gases from comet 67P/Churyumov-Gerasimenko. The interpretation of this dataset and unravelling underlying desorption mechanisms requires detailed laboratory studies.
Aims: We aim to improve our understanding of the desorption pattern…
Correlating Intrinsic Stellar Parameters with Mg II Self-reversal Depths
Peacock, Sarah; Redfield, Seth; Youngblood, Allison +2 more
The Mg II h&k emission lines (2803, 2796 Å) are a useful tool for understanding stellar chromospheres and transition regions due to their intrinsic brightness, relatively low interstellar medium (ISM) absorption interference, and abundance of archival spectra available. Similar to other optically thick chromospheric emission lines such as H I Lyα,…