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The highest mass Kepler red giants - I. Global asteroseismic parameters of 48 stars
Li, Yaguang; Huber, Daniel; Bedding, Timothy R. +6 more
When low- and intermediate-mass stars evolve off the main sequence, they expand and cool into the red giant stages of evolution, which include those associated with shell H burning (the red giant branch), core He burning (the red clump), and shell He burning (the asymptotic giant branch). The majority of red giants have masses <2 M⊙,…
AB Aur, a Rosetta stone for studies of planet formation. III. Continuum observations at 2 and 7 mm
Anglada, G.; Osorio, M.; Neri, R. +7 more
Context. Observational constraints on dust properties in protoplanetary disks are key to better understanding disk evolution, their dynamics, and the pathway to planet formation, but also surface chemistry, the main driver of chemical complexity.
Aims: We continue our exploration of the protoplanetary disk around AB Aur by characterizing its …
Autonomous disentangling for spectroscopic surveys
Xiang, Maosheng; Rix, Hans-Walter; Fouesneau, Morgan +2 more
A suite of spectroscopic surveys is producing vast sets of stellar spectra with the goal of advancing stellar physics and Galactic evolution by determining their basic physical properties. A substantial fraction of these stars are in binary systems, but almost all large-survey modelling pipelines treat them as single stars. For sets of multi-epoch…
A Blueprint for the Milky Way's Stellar Populations. V. 3D Local Dust Extinction
Beers, Timothy C.; Chiti, Anirudh; An, Deokkeun
Using a grid of empirically calibrated synthetic spectra developed in our previous study, we construct an all-sky 3D extinction map from the large collection of low-resolution XP spectra in Gaia DR3. Along each line of sight, with an area ranging from 0.2 to 13.4 deg2, we determine both the reddening and metallicity of main-sequence sta…
Origin and Properties of the Near-subsonic Solar Wind Observed by Parker Solar Probe
Liu, Ying D.; Kasper, Justin C.; Stevens, Michael L. +3 more
We identify and examine the solar wind intervals near the sonic critical point (i.e., M S ∼ 1) observed by the Parker Solar Probe. The near-subsonic wind intervals show similar properties: a low density, an extremely low velocity, a low proton temperature, and essentially no magnetic field deflections compared with the surrounding sol…
The impact of third dredge-up on the mass loss of Mira variables
Eriksson, K.; Wolter, U.; Höfner, S. +8 more
Context. The details of the mass-loss process in the late stages of low- and intermediate-mass stellar evolution are not well understood, in particular its dependence on stellar parameters. Mira variables are highly suitable targets for studying this mass-loss process. Aims. Here, we follow up on our earlier finding that a near-to-mid-infrared (NI…
Metallicities and Refined Stellar Parameters for 52 Cool Dwarfs with Transiting Planets and Planet Candidates
Mayo, Andrew W.; Schlieder, Joshua E.; Giacalone, Steven +8 more
We collected near-infrared spectra of 65 cool stars with the NASA Infrared Telescope Facility and analyzed them to calculate accurate metallicities and stellar parameters. The sample of 55 M dwarfs and 10 K dwarfs includes 25 systems with confirmed planets and 27 systems with planet candidates identified by the K2 and TESS missions. Three of the 2…
Connecting core galaxy properties to the massive black hole binary population
Gültekin, Kayhan; Harris, C. J.
We investigate how the properties of massive black hole binaries influence the observed properties of core galaxies. We compare the observed trend in stellar mass deficit as a function of total stellar mass in the core galaxy with predicted trends in IllustrisTNG. We calculate mass deficits in simulated galaxies by applying subgrid, post-processin…
High-resolution Spectroscopic Analysis of Four Unevolved Barium Stars
Pereira, C. B.; Holanda, N.; Drake, N. A. +4 more
A classical local thermodynamic equilibrium analysis, based on high-resolution spectroscopic data, is performed for a sample of three potential barium dwarf candidates and one star already recognized as such. We derived their atmospheric parameters, estimated their masses and luminosities, and determined chemical abundances for a set of 21 element…
PRODIGE - planet-forming disks in Taurus with NOEMA. I. Overview and first results for 12CO, 13CO, and C18O
Cunningham, N.; Ceccarelli, C.; Henning, Th. +21 more
Context. The physics and chemistry of planet-forming disks are far from being fully understood. To make further progress, both broad line surveys and observations of individual tracers in a statistically significant number of disks are required.
Aims: Our aim is to perform a line survey of eight planet-forming Class II disks in Taurus with th…