Search Publications
The Ultraviolet Extinction Map and Dust Properties at High Galactic Latitude
Jiang, Biwei; Yuan, Haibo; Li, Jun +1 more
Extinction in ultraviolet is much more significant than in optical or infrared, which can be very informative to precisely measure the extinction and understand the dust properties in the low-extinction areas. The high Galactic latitude sky is such an area, important for studying the extragalactic sky and the universe. Based on the stellar paramet…
Variations of the Galactic Cosmic Rays in the Recent Solar Cycles
Zhao, Lingling; Fu, Shuai; Zhang, Xiaoping +1 more
In this paper, we study the Galactic cosmic-ray (GCR) variations over the solar cycles 23 and 24, with measurements from NASA's Advanced Composition Explorer/Cosmic Ray Isotope Spectrometer instrument and the ground-based neutron monitors (NMs). The results show that the maximum GCR intensities of heavy nuclei (5 ≤ Z ≤ 28, 50∼500 MeV nuc-1
SuperBoRG: Search for the Brightest of Reionizing Galaxies and Quasars in HST Parallel Imaging Data
Morishita, T.
The Hubble Space Telescope (HST) has been providing tremendous survey efficiency via its pure-parallel mode by observing another field in parallel with the primary instrument in operation for the primary observation. In this study, we present a new archival project, SuperBoRG, which aims at compiling data taken in extragalactic parallel programs o…
SMARPs and SHARPs: Two Solar Cycles of Active Region Data
Sun, Xudong; Bobra, Monica G.; Wright, Paul J. +1 more
We present a new data product, called Space-Weather MDI Active Region Patches (SMARPs), derived from maps of the solar surface magnetic field taken by the Michelson Doppler Imager on board the Solar and Heliospheric Observatory. Together with the Space-Weather HMI Active Region Patches (SHARPs), derived from similar maps taken by the Helioseismic …
One of Everything: The Breakthrough Listen Exotica Catalog
DeBoer, David; Gajjar, Vishal; Siemion, Andrew P. V. +12 more
We present Breakthrough Listen's Exotica Catalog as the centerpiece of our efforts to expand the diversity of targets surveyed in the Search for Extraterrestrial Intelligence (SETI). As motivation, we introduce the concept of survey breadth, the diversity of objects observed during a program. Several reasons for pursuing a broad program are given,…
The Old Moving Groups in the Field of Taurus
Fang, Min; Tian, Hao; Yang, Chengqun +3 more
In this work, we present a systematic search for stellar groups in the Taurus field by applying the DBSCAN algorithm to the data from Gaia DR2. We find 22 groups, consisting of 8 young groups (Groups 1-8) at ages of 2-4 Myr and distances of ∼130-170 pc, and 14 old groups (Groups 9-22) at ages of 8-49 Myr and distances of ∼110-210 pc. We characteri…
A New Catalog of Asymptotic Giant Branch Stars in Our Galaxy
Suh, Kyung-Won
We present a new catalog of 11,209 O-rich asymptotic giant branch (AGB) stars and 7172 C-rich AGB stars in our Galaxy, identifying more AGB stars in the bulge component and considering more visual carbon stars. For each object, we cross-identify the Infrared Astronomical Satellite (IRAS), AKARI, Midcourse Space Experiment, Wide-field Infrared Surv…
Heliosheath Proton Distribution in the Plasma Reference Frame
McComas, D. J.; Dayeh, M. A.; Swaczyna, P. +2 more
Properties of the inner heliosheath (IHS) plasma are inferred from energetic neutral atom (ENA) observations by ∼1 au spacecraft. However, the Compton-Getting effect due to the plasma velocity relative to the spacecraft is rarely taken into account, even though the plasma speed is a significant fraction of the ENA speed. In this study, we transfor…
Chromospheric Activity of M Stars Based on LAMOST Low- and Medium-resolution Spectral Surveys
Shi, Jianrong; Han, Xianming L.; Misra, Prabhakar +5 more
We have used the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) low-resolution and medium-resolution spectroscopic surveys to explore the chromospheric statistical properties and variations of M stars. There are 738,477 LAMOST low-resolution spectra of 622,523 M stars. We have calculated equivalent widths of the Ca II H&K, …
Data-driven Spectroscopic Estimates of Absolute Magnitude, Distance, and Binarity: Method and Catalog of 16,002 O- and B-type Stars from LAMOST
Yuan, Hai-Bo; Xiang, Maosheng; Ting, Yuan-Sen +4 more
We present a data-driven method to estimate absolute magnitudes for O- and B-type stars from the LAMOST spectra, which we combine with Gaia DR2 parallaxes to infer distance and binarity. The method applies a neural network model trained on stars with precise Gaia parallax to the spectra and predicts Ks-band absolute magnitudes ${M}_{K{\…