Search Publications
On the Unusual Variability of 2MASS J06195260-2903592: A Long-lived Disk around a Young Ultracool Dwarf
Magnier, Eugene A.; Gaidos, Eric; Shappee, Benjamin J. +11 more
We present the characterization of the low-gravity M6 dwarf 2MASS J06195260-2903592, previously identified as an unusual field object based on its strong IR excess and variable near-IR spectrum. Multiple epochs of low-resolution (R ≈ 150) near-IR spectra show large-amplitude (≈0.1-0.5 mag) continuum variations on timescales of days to 12 yr, unlik…
The MOSDEF survey: towards a complete census of the z 2.3 star-forming galaxy population
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +16 more
We analyse the completeness of the MOSDEF survey, in which z ~ 2 galaxies were selected for rest-optical spectroscopy from well-studied HST extragalactic legacy fields down to a fixed rest-optical magnitude limit (HAB = 24.5). The subset of z ~ 2 MOSDEF galaxies with high signal-to-noise (S/N) emission-line detections analysed in previo…
The Solar Wind at (16) Psyche: Predictions for a Metal World
Collinson, Glyn A.; Chen, Li-Jen; Jian, Lan K. +1 more
NASA's Psyche spacecraft will carry a magnetometer to main-belt asteroid (16) Psyche to search for remanent magnetic fields, and to attempt electromagnetic sounding of the interior. However, the Psyche spacecraft does not carry an instrument to measure solar wind plasmas. We thus combine data from five missions that have measured the solar wind at…
A Spectroscopic View of the JWST/GTO Strong Lensing Cluster A1489
Diaferio, Antonaldo; Geller, Margaret J.; Rines, Kenneth J. +1 more
We discuss a spectroscopic survey of the strong lensing cluster A1489 that includes redshifts for 195 cluster members along with central velocity dispersions for 188 cluster members. The caustic technique applied to the redshift survey gives the dynamical parameters M 200 = (1.25 ± 0.09) × 1015 M ⊙, R 200
Comparing Quasi-Parallel and Quasi-Perpendicular Configuration in the Terrestrial Magnetosheath: Multifractal Analysis
Sorriso-Valvo, Luca; Burgess, David; Yordanova, Emiliya +4 more
The terrestrial magnetosheath is characterized by large-amplitude magnetic field fluctuations. In some regions, and depending on the bow-shock geometry, these can be observed on several scales, and show the typical signatures of magnetohydrodynamic turbulence. Using Cluster data, magnetic field spectra and flatness are observed in two intervals se…
Mass-Velocity Dispersion Relation by Using the Gaia Data and Its Effect on Interpreting Short-duration and Degenerate Microlensing Events
Sajadian, Sedighe; Rahvar, Sohrab; Kazemian, Fatemeh
Gravitational microlensing, the lensing of stars in the Milky Way with other stars, has been used for exploring compact dark matter objects, exoplanets, and black holes. The duration of microlensing events, the so-called Einstein crossing time, is a function of distance, mass, and velocities of lens objects. Lenses with different ages and masses m…
Stellar Population Astrophysics (SPA) with the TNG. α-elements, lithium, sodium and aluminum in 16 open clusters
Vallenari, A.; Bragaglia, A.; Spina, L. +13 more
Context. Exploring the Galactic chemical evolution and enrichment scenarios with open clusters (OCs) allows us to understand the history of the Milky Way disk. High-resolution spectra of OCs are a crucial tool, as they provide precise chemical information, to combine with precise distances and ages.
Aims: The aim of the Stellar Population Ast…
Studying the Physical Parameters of the Stellar Binary System Hip 42455 (HD 73900)
Abu-Dhaim, A.; Taani, A.; Tanineah, D. +3 more
We present the results of the combined spectrophotometric and dynamic analysis for the close visual binary star Hip 42455 (HD 73900, I 314). A model binary that consists of two main sequence stars with a clear magnitude difference, but completely different estimations of their spectral types, and different parallax measurements given by the four c…
Properties of EUV Imaging Spectrometer (EIS) Slot Observations
Ugarte-Urra, Ignacio; Young, Peter R.
The Extreme ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft has been operating since 2006, returning high-resolution data in the 170 - 212 and 246 - 292 Å wavelength regions. EIS has four slit options, with the narrow 1'' and 2'' slits used for spectroscopy and the wide 40'' and 266''
New Massive Contact Twin Binary in a Radio-quiet H II Region Associated with the M17 Complex
Chen, Zhiwei; Jiang, Zhibo; Yin, Jia +3 more
Early-B stars, much less energetic than O stars, may create an H II region that appears as radio-quiet. We report the identification of new early-B stars associated with the radio-quiet H II region G014.645-00.606 in the M17 complex. The radio-quiet H II region G014.645-00.606 is adjacent to three radio-quiet WISE H II region candidates. The ioniz…