Search Publications
Modeling the Hα Emission Surrounding Spica Using the Lyman Continuum from a Gravity-darkened Central Star
Aufdenberg, Jason P.; Hammill, Joseph M.
The large, faint Hα emission surrounding the early B-star binary Spica has been used to constrain the total hydrogen recombination rate of the nebula and indirectly probe the Lyman continuum luminosity of the primary star. Early analysis suggested that a stellar atmosphere model, consistent with Spica A's spectral type, has a Lyman continuum lumin…
Spatial distributions and origin of hydrated sulfate minerals at the mineral bowl in Ophir Chasma, Mars
Li, Bo; Qiao, Le; Ling, Zongcheng +9 more
Numerous occurrences of hydrated minerals (e.g., phyllosilicate, sulfate) have been found on the surface of Mars by remote sensing and in-situ exploration missions, providing strong evidence of the aqueous environment in Martian history. However, the detailed origin of these hydrated minerals is often controversial, reducing their usefulness in co…
The structure of the IRAS05168+3634 star-forming region
Nikoghosyan, E. H.; Azatyan, N. M.; Andreasyan, D. H. +1 more
This study aims to determine the main physical parameters (N(H2) hydrogen column density and Td dust temperature) of the Interstellar medium, and their distribution in the extended star-forming region, which includes IRAS 05156+3643, 05162+3639, 05168+3634, 05177+3636, and 05184+3635 sources. We also provide a comparative ana…
Spectral evolution of X-ray pulsar 4U 1901+03 during the 2019 outburst based on Insight-HXMT and NuSTAR observations
Zhang, Shu; Doroshenko, Victor; Tsygankov, Sergey S. +7 more
We report on a detailed spectral analysis of emission from X-ray pulsar 4U 1901+03 using data obtained by the Insight-HXMT and NuSTAR observatories during the 2019 outburst of the source. Thanks to the extensive coverage of the outburst by Insight-HXMT, we were able to investigate the spectral evolution of the source as a function of flux, and com…
Variations in the Correlations of Acceleration and Force of Slow and Fast CMEs with Solar Activity during Solar Cycles 23 - 24
Du, Zhanle
Studying the behavior of coronal mass ejections (CMEs) is important for both solar physics and space weather. The correlations of smoothed monthly mean daily integrated CME acceleration [a ], mass [M ], and the force [M a ] to drive CMEs with sunspot activity [RI] are analyzed for both slow and fast CMEs and for both Solar Cycles 23 and…
The effect of continuum elimination in identifying circumstellar dust around Mira
Speck, Angela K.; Shepard, Lisa M.
Asymptotic giant branch (AGB) stars are major contributors of cosmic dust to the universe. Typically, dust around AGB stars is investigated via radiative transfer (RT) modelling, or via simple deconstruction of observed spectra. However, methodologies applied vary. Using archival spectroscopic, photometric, and temporal data for the archetypal dus…
Corrigendum to "Photometrically-corrected global infrared mosaics of Enceladus: New implications for its spectral diversity and geological activity" [Icarus 349 (2020) 113848]
Le Mouélic, S.; Rodriguez, S.; Sotin, C. +4 more
The authors regret that the longitude grid in Figures. 9 and 11 was wrongly shifted by 180° in the original manuscript. We provide below the correct versions of Figures. 9 and 11.
Identifying Periodic Variable Stars and Eclipsing Binary Systems with Long-term Las Cumbres Observatory Photometric Monitoring of ZTF J0139+5245
Vanderbosch, Zachary P.; Montgomery, Michael H.; Sanghi, Aniket
We present the results of our search for variable stars using the long-term Las Cumbres Observatory (LCO) monitoring of white dwarf ZTF J0139+5245 with the two 1.0 m telescope nodes located at McDonald Observatory using the Sinistro imaging instrument. In this search, we find 38 variable sources, of which 27 are newly discovered or newly classifie…
Analysis of Study Results of the Polar Coronal Hole on the Sun According to Observations in the Microwave Wavelength Range
Golubchina, O. A.
An overview is presented of the main results of the study of the polar coronal hole over the North pole of the Sun based on observations of the solar eclipse on March 29, 2006, using the RATAN-600 radio telescope in a wide cm-range of wavelengths (1.03, 1.38, 2.7, 6.2, 13.0, 30.7 cm) along with observational and theoretical data about the properti…
A joint occultation and speckle investigation of the binary star TYC 1947-290-1 and of the asteroid (87) Sylvia
Richichi, A.; Dyachenko, V.; Obolentseva, M. +4 more
We report on the occultation of the star TYC 1947-290-1 by the asteroid (87) Sylvia. While asteroidal occultations occurring at fixed professional-level locations are relatively rare and are only recently starting to be observed with sufficiently high time resolution and sensitivity, they have the capability to measure sub-milliarcsecond angular d…