Search Publications
Mixed H/He bursts in SAX J1748.9-2021 during the spectral change of its 2015 outburst
Bozzo, E.; Zhang, S.; Kuiper, L. +6 more
SAX J1748.9-2021 is a transiently accreting X-ray millisecond pulsar. It is also known as an X-ray burster source discovered by Beppo-SAX. We analyzed the persistent emission and type-I X-ray burst properties during its 2015 outburst. The source changed from hard to soft state within half day. We modeled the broadband spectra of the persistent emi…
GD-1: The Relic of an Old Metal-poor Globular Cluster
Yanny, Brian; Wu, Yue; Li, Guang-Wei
Combining data from Gaia DR2, SDSS DR14, and LAMOST DR6, we update the fit to model of the properties of the stellar stream GD-1 and find that it has an age of ∼13 Gyr, [Fe/H] of -2.2 ± 0.12, and a distance from the Sun of ∼8 kpc. We tabulate six-dimensional (6D) phase-space fiducial points along the GD-1 stream orbit over a 90° arc. The fitted or…
The Hubble Space Telescope UV Legacy Survey of Galactic globular clusters - XIII. ACS/WFC parallel-field catalogues
Anderson, J.; Milone, A. P.; Bedin, L. R. +12 more
As part of the Hubble Space Telescope UV Legacy Survey of Galactic globular clusters, 110 parallel fields were observed with the Wide Field Channel of the Advanced Camera for Surveys, in the outskirts of 48 globular clusters, plus the open cluster NGC 6791. Totalling about 0.3 deg2 of observed sky, this is the largest homogeneous Hubble…
Virtual Planetary Space Weather Services offered by the Europlanet H2020 Research Infrastructure
André, N.; Budnik, E.; Grande, M. +25 more
Under Horizon 2020, the Europlanet 2020 Research Infrastructure (EPN2020-RI) will include an entirely new Virtual Access Service, "Planetary Space Weather Services" (PSWS) that will extend the concepts of space weather and space situational awareness to other planets in our Solar System and in particular to spacecraft that voyage through it. PSWS …
Magnetic Field near Venus: Comparison between Solar Cycle 24 and Previous Cycles
Xu, Qi; Zhang, Tielong; Xu, Xiaojun +3 more
Solar Cycle 24 has been proven to be the weakest cycle in solar activity in the last century. So far, most of the evidence has been presented near Earth at 1 au. In this study, we statistically studied the magnetic field of the solar wind near Venus and the induced magnetosphere of Venus using Pioneer Venus Orbiter (PVO) and Venus Express (VEX) ob…
Near-infrared Spectra of a Sample of Galactic Unclassified B[e] Stars
Kraus, Michaela; Arias, María L.; Cidale, Lydia S. +4 more
B[e] stars are surrounded by cool and dense circumstellar environments where molecules and dust are formed. These stars are rare and display complex spectra whose photospheric features are frequently veiled by their circumstellar envelopes, making it difficult to assign them spectral types and evolutionary phases. On the basis of a detailed analys…
“Red” but Not “Dead”: Actively Star-forming Brightest Cluster Galaxies at Low Redshifts
Yan, Haojing; Runge, James
Brightest cluster galaxies (BCGs) are believed to have assembled most of their stars early in time and therefore should be passively evolving at low redshifts and appear “red-and-dead.” However, there have been reports that a minority of low-redshift BCGs still have ongoing star formation rates (SFRs) of a few to even ∼ 100 {M}⊙ {{yr}}…
The Web-Based Interactive Mars Analysis and Research System for HRSC and the iMars Project
van Gasselt, S.; Gwinner, K.; Michael, G. G. +9 more
Web-based planetary image dissemination platforms usually show outline coverage of available data and offer querying for metadata as well as preview and download. While the usual form of presenting multiorbit data sets is to merge the data into a larger mosaic, for change detection purposes it is essential to maintain the individual images as an i…
Outstanding X-ray emission from the stellar radio pulsar CU Virginis
Schmitt, J. H. M. M.; Robrade, J.; Oskinova, L. M. +2 more
Context. Among the intermediate-mass magnetic chemically peculiar (MCP) stars, CU Vir is one of the most intriguing objects. Its 100% circularly polarized beams of radio emission sweep the Earth as the star rotates, thereby making this strongly magnetic star the prototype of a class of nondegenerate stellar radio pulsars. While CU Vir is well stud…
Angular Momentum Evolution of Stellar Disks at High Redshifts
Shimasaku, Kazuhiro; Kawamata, Ryota; Okamura, Taku
The stellar disk size of a galaxy depends on the ratio of the disk stellar mass to the halo mass, m ⋆ ≡ M ⋆/M dh, and the fraction of the dark halo angular momentum transferred to the stellar disk, j ⋆ ≡ J ⋆/J dh. Since m ⋆ and j ⋆ are determined by many star f…