Search Publications
Polycyclic Aromatic Hydrocarbon Emission Toward the Galactic Bulge
Blommaert, J. A. D. L.; Peeters, E.; Cami, J. +1 more
We examine polycyclic aromatic hydrocarbon (PAH), dust, and atomic/molecular emission toward the Galactic bulge using Spitzer Space Telescope observations of four fields: C32, C35, OGLE, and NGC 6522. These fields are approximately centered on (l, b) = (0.°0, 1.°0), (0.°0, -1.°0), (0.°4, -2.°4), and (1.°0, -3.°8), respectively. Far-infrared photom…
The association of the Hale sector boundary with RHESSI solar flares and active longitudes
Hannah, I. G.; Hudson, H. S.; Loumou, K.
Context. The heliospheric magnetic field (HMF) is structured into large sectors of positive and negative polarity. The parts of the boundary between these sectors where the change in polarity matches that of the leading-to-following sunspot polarity in that solar hemisphere, are called Hale sector boundaries (HSB).
Aims: We investigate the fl…
Cosmic happenstance: 24-µm selected, multicomponent Herschel sources are line-of-sight projections
Oliver, Seb; Wang, Lingyu; Wardlow, Julie L. +3 more
In this paper, we investigate the physical associations between blended far-infrared (FIR)-emitting galaxies, in order to identify the level of line-of-sight projection contamination in the single-dish Herschel data. Building on previous work, and as part of the Herschel Extragalactic Legacy Project, we identify a sample of galaxies in the COSMOS …
Tracing the Origin of Moving Groups. I. The γ Leo Moving Group with High-resolution Spectra from the Subaru Telescope
Zhao, G.; Chen, Y. Q.; Zhao, J. K. +7 more
We present chemical abundances of 15 stars in the γ Leo moving group based on high-resolution spectra with the Subaru High Dispersion Spectrograph. The sample was picked up by applying wavelet transform to UVW velocity components of stars in the solar neighborhood. Both photometric and spectroscopic method have been used to determine the stellar p…
Energetic electron measurements near Enceladus by Cassini during 2005-2015
Krupp, N.; Roussos, E.; Khurana, K. K. +9 more
Enceladus is the main source of neutral and charged particles in the Saturnian magnetosphere. The particles originate at more than 100 active geysers forming a plume above the south pole of the moon and are continuously released into Saturn's magnetosphere. Therefore the understanding of the interaction of those particles and the local magnetosphe…
Pulsations and period variations of the δ Scuti star AN Lyncis in a possible three-body system
Li, Gang; Su, Jie; Fu, Jianning +5 more
Observations for the δ Scuti star AN Lyn have been made between 2008 and 2016 with the 85-cm telescope at Xinglong station of National Astronomical Observatories of China, the 84-cm telescope at SPM Observatory of Mexico and the Nanshan One metre Wide field Telescope of Xinjiang Observatory of China. Data in V in 50 nights and in R in 34 nights ar…
Final Mimas and Enceladus atlases derived from Cassini-ISS images
Matz, K. -D.; Kersten, E.; Porco, C. C. +4 more
The Imaging Science Subsystem (ISS) on-board Cassini took a few high-resolution images of the icy Saturnian satellites Mimas and Enceladus over the last seven years of the Cassini mission during non-targeted flybys. We used the new Mimas images to improve the existing semi-controlled mosaic of Mimas. A new controlled Enceladus mosaic was published…
An Infrared Study of the Circumstellar Material Associated with the Carbon Star R Sculptoris
Lau, R. M.; Hankins, M. J.; Herter, T. L. +2 more
The asymptotic giant branch (AGB) star R Sculptoris (R Scl) is one of the most extensively studied stars on the AGB. R Scl is a carbon star with a massive circumstellar shell (M shell ∼ 7.3 × 10-3 M ⊙) that is thought to have been produced during a thermal pulse event ∼2200 years ago. To study the thermal dust emis…
Cassini/MIMI Observations on the Dungey Cycle Reconnection and Kelvin-Helmholtz Instability in Saturn's Magnetosphere
Dialynas, Konstantinos
A new composite analysis of ∼13 years of Cassini's Charge Energy Mass Spectrometer measurements, presented by Allen et al. (2018, https://doi.org/10.1029/2018JA025262), suggests that the asymmetrically distributed suprathermal He++ in Saturn's magnetosphere is due to Dungey cycle relate…
Alumina Polymorphism in the Circumstellar Dust Shells of Asymptotic Giant Branch Stars
Sargent, Benjamin A.
Many emission features remain unidentified in the infrared spectra of asymptotic giant branch (AGB) stars. In particular, features at ∼11, 20, 28, and 32 µm have been noted in mid-infrared spectra of oxygen-rich AGB stars. Here, I present models of dust excess emission in 36 spectra of 24 AGB stars from the Short Wavelength Spectrometer on b…