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Rapidly oscillating TESS A-F main-sequence stars: are the roAp stars a distinct class?
Balona, L. A.
From sector 1-44 TESS observations, 19 new rapidly oscillating Ap (roAp) stars, 103 ostensibly non-peculiar stars with roAp-like frequencies, and 617 δ Scuti stars with independent frequencies typical of roAp stars were found. Examination of all chemically peculiar stars observed by TESS resulted in the discovery of 199 Ap stars that pulsate as δ …
The SOFIA FEEDBACK Legacy Survey Dynamics and Mass Ejection in the Bipolar H II Region RCW 36
Schneider, N.; Zavagno, A.; Stutzki, J. +20 more
We present [C II] 158 µm and [O I] 63 µm observations of the bipolar H II region RCW 36 in the Vela C molecular cloud, obtained within the SOFIA legacy project FEEDBACK, which is complemented with APEX 12/13CO (3-2) and Chandra X-ray (0.5-7 keV) data. This shows that the molecular ring, forming the waist of the bipolar nebul…
Substructures, resonances, and debris streams. A new constraint on the inner shape of the Galactic dark halo
Helmi, Amina; Koppelman, Helmer H.; Dodd, Emma
Context. The local stellar halo of the Milky Way contains the debris from several past accretion events.
Aims: Here we study in detail the structure and properties of nearby debris associated with the Helmi streams, which was originally identified as an overdensity in integrals of motion space.
Methods: We use 6D phase-space information …
Deducing Lunar Regolith Porosity From Energetic Neutral Atom Emission
Wurz, P.; Galli, A.; Jäggi, N. +6 more
The porosity of the upper layers of regolith is key to the interaction of an airless planetary body with precipitating radiation, but it remains difficult to characterize. One of the effects that is governed by regolith properties is Energetic Neutral Atom (ENA) emission in the form of reflected and neutralized solar wind protons. We simulate this…
The DR21(OH) Trident-Resolving the Massive Ridge into Three Entangled Fibers as the Initial Condition of Cluster Formation
Qiu, Keping; Li, Guang-Xing; Cao, Yue +1 more
DR21(OH) ridge, the central part of a high-mass star- and cluster-forming hub-filament system, is resolved spatially and kinematically into three nearly parallel fibers (f1, f2, and f3) with a roughly north-south orientation, using the observations of molecular transitions of H13CO+ (1 - 0), N2H+ (1 - 0)…
Milky Way archaeology using RR Lyrae and type II Cepheids. II. High-velocity RR Lyrae stars and Milky Way mass
Hansen, C. J.; Lemasle, B.; Fabrizio, M. +10 more
We report the discovery of high-velocity candidates among RR Lyrae stars found in the Milky Way halo. We identified nine RR Lyrae stars with Galactocentric velocities exceeding the local escape velocity based on the assumed Galaxy potential. Furthermore, based on a close examination of their orbits', we ruled out their ejection location in the Mil…
Unraveling the Observational Signatures of Cloud-Cloud Collision and Hub-filament Systems in W31
Dewangan, L. K.; Fukui, Y.; Sano, H. +3 more
To understand the formation process of massive stars, we present a multiscale and multiwavelength study of the W31 complex hosting two extended H II regions (i.e., G10.30-0.15 (hereafter, W31-N) and G10.15-0.34 (hereafter, W31-S)) powered by a cluster of O-type stars. Several Class I protostars and a total of 49 ATLASGAL 870 µm dust clumps (…
Photometric Recalibration of the SDSS Stripe 82 to a Few Millimagnitude Precision with the Stellar Color Regression Method and Gaia EDR3
Huang, Bowen; Yuan, Haibo
By combining spectroscopic data from the LAMOST DR7, Sloan Digital Sky Survey (SDSS) DR12, and corrected photometric data from the Gaia EDR3, we apply the stellar color regression (SCR) method to recalibrate the SDSS Stripe 82 standard stars catalog of Ivezić et al. With a total number of about 30,000 spectroscopically targeted stars, we have mapp…
The Role of Disk Tearing and Precession in the Observed Variability of Pleione
Carciofi, A. C.; Tycner, C.; Jones, C. E. +2 more
We acquired Hα spectroscopic observations from 2005 to 2019 showing Pleione has transitioned from a Be phase to a Be-shell phase during this period. Using the radiative transfer code HDUST, we created a grid of ~100,000 disk models for Pleione. We successfully reproduced the observed transition with a disk model that varies in inclination while ma…
Ram pressure candidates in UNIONS
Chambers, Kenneth C.; Wainscoat, Richard J.; Oguri, Masamune +17 more
We present a search for disturbed, candidate ram pressure stripping galaxies across more than 50 spectroscopically selected SDSS groups and clusters. 48 ram pressure candidates are visually identified in these systems using high-quality UNIONS imaging from the Canada-France-Hawaii Telescope, covering ${\sim }6200\, \mathrm{deg^2}$ and ${\sim }2800…