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Quantifying interstellar extinction at high Galactic latitudes
Gilmore, Gerry; Mandel, Kaisey S.; O'Callaghan, Matthew
A detailed map of the distribution of dust at high Galactic latitudes is essential for future cosmic microwave background polarization experiments because the dust, while diffuse, remains a significant foreground in these regions. We develop a Bayesian model to identify a region of the Hertzsprung-Russell (HR) diagram suited to constrain the singl…
Gas-phase Molecules in Protoplanetary Nebulae with the 21 µm Emission Feature
Zhang, Yong; Li, Fei; Zhang, Jiang-Shui +6 more
It has been more than 30 years since the enigmatic 21 µm emission feature was first discovered in protoplanetary nebulae (PPNs). Although dozens of different dust carrier candidates have been proposed, there is as yet no widely accepted one. We present the results of molecular observations toward 21 µm objects using the 10 m Submillime…
Chemically peculiar stars on the pre-main sequence
Paunzen, E.; Prišegen, M.; Faltová, N. +12 more
Context. The chemically peculiar (CP) stars of the upper main sequence are defined by spectral peculiarities that indicate unusual elemental abundance patterns in the presence of diffusion in the calm, stellar atmospheres. Some of them have a stable local magnetic field of up to several kiloGauss. The pre-main-sequence evolution of these objects i…
An Episode of Occultation Events in Gaia21bcv
Gaidos, Eric; Shappee, Benjamin J.; Kenworthy, Matthew A. +4 more
A previously unremarkable star near the Canis Major OB1/R1 association underwent an episode of multiple deep brightness minima. Light curves based on archival Gaia, Zwicky Transient Facility (ZTF), and NEOWISE data and additional observations from the Las Cumbres Observatory and UKIRT show that the star was not variable prior to 2019 August 18 (MJ…
Boron Abundances in Early B Dwarfs of the Galactic Open Cluster NGC 3293
Cunha, Katia; Langer, Norbert; Proffitt, Charles R. +4 more
New boron abundances or upper limits have been determined for eight early B stars in the young Galactic open cluster NGC 3293, using UV spectra obtained by the Hubble Space Telescope Cosmic Origins Spectrograph. With previous observations, there are now 18 early B stars in this cluster with boron measurements. Six of the newly observed stars have …
Asteroseismology of One of the Most Rapidly Rotating DBV Stars: EPIC 248705247
Su, Jie; Cang, Tianqi; Fu, Jianning +4 more
We present a comprehensive analysis of oscillations of the helium-rich white dwarf DBV star EPIC 248705247 (SDSS J102106.69+082724.8). We extract the light curves from 79.7 days of K2 Campaign 14 data and identify 21 independent frequencies, including three complete and three incomplete dipole modes, with an average frequency splitting of 20.37 ± …
Direct Observations of a Shock Traversing Preceding Two Coronal Mass Ejections: Insights from Solar Orbiter, Wind, and STEREO Observations
Zhang, Zhiyong; Wang, Yuming; Shen, Chenglong +8 more
The three successive coronal mass ejections (CMEs) that erupted from 2023 November 27–28, provide the first opportunity to shed light on the entire process of a shock propagating through, sequentially compressing, and modifying two preceding CMEs using in situ data from Solar Orbiter, Wind, and STEREO-A. We describe the interaction of the three CM…
Atmospheric characterization and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS
Ehrenreich, D.; Wheatley, P. J.; Nealon, R. +10 more
We present high spectral resolution observations of the hot Jupiter WASP-94 A b using the HARPS instrument on ESO's 3.6-m telescope in La Silla, Chile. We probed for Na absorption in its atmosphere as well as constrained the previously reported misaligned retrograde orbit using the Rossiter-McLaughlin effect. Additionally, we undertook a combined …
Orbit of the visual binary star 61 Cyg
Izmailov, I. S.; Apetyan, A. A.
We present the orbit and the mass estimates for the components of the visual binary star 61 Cyg obtained with the positional observations, including the high-precision Gaia data, and the measurements of differences in the radial velocities and the radial accelerations of the components. Since the orbital period of this star significantly exceeds t…
Precise Mass, Orbital Motion, and Stellar Properties of the M-dwarf Binary LP 349‑25AB
Curiel, Salvador; Ortiz-León, Gisela N.; Mioduszewski, Amy J. +1 more
LP 349‑25 is a well-studied close stellar binary system comprised of two late M dwarf stars, where both stars are close to the limit between star and brown dwarf. This system was previously identified as a source of gigahertz radio emission. We observed LP 349‑25AB over 11 epochs in 2020–2022, detecting both components in this nearby binary system…