Search Publications
Missions
Journals
Publication Years
Spectroscopy of B and Be Stars in the Young Open Star Cluster NGC 581 (M 103)
Tarasov, A. E.
Based on moderate-resolution spectra in the range 4200-5200 Å, we have studied B and Be stars in the young open star cluster NGC 581. The temperatures of the program stars have been derived by the differential method with the choice of simple spectroscopic parameters for a number of lines and their comparison with the analogous parameters of a lar…
Mineralogical Mapping Using Chandrayaan-1 Hyperspectral (HySI) Data from the South Pole Region
Sayyad, S. B.; Mohammed Zeeshan, R.
The space weathering effect acts as barrier for accurately assessing the surface mineralogy and compositional analysis. It can be addressed by radiative transfer model that best explains the space weathering effect on remotely sensed spectra.
Unveiling the mineralogical composition of lunar farside mare basalts
Flahaut, Jessica; Bott, Nicolas; Martinot, Mélissa +1 more
1. IntroductionOne of the Moon"s most surprising characteristics is its crustal asymmetry; the farside hemisphere, dominated by ancient highlands and covered with a few mare deposits, has a different volcanic history than the (sampled) nearside [1]. Surface dating of the lunar mare basalts revealed that the volcanism on the Moon lasted between ~3.…
Narrow-Line SY1 NGC 4748 in X-Rays: Detailed Case-Study
Vasylenko, A.; Fedorova, E.; Del Popolo, A.
We analyze all the available X-ray data in order to monitor the narrow-line Seyfert 1 galaxy NGC 4748, namely XMM-Newton (EPIC and OM), INTEGRAL (ISGRI and JEM-X), and SWIFT (BAT and XRT) data to study both the wide-band 0.5-195 keV spectrum and light curves in details. To this aim, we use the autocorrelation analysis of the light curves, modeling…
Analytic Marginalization of Absorption Line Continua
Tchernyshyov, Kirill
Absorption line spectroscopy is a powerful way of measuring properties of stars and the interstellar medium. Absorption spectra are often analyzed manually, an approach that limits reproducibility and which cannot practically be applied to modern data sets consisting of thousands or even millions of spectra. Simultaneous probabilistic modeling of …
LSST: From Science Drivers to Reference Design and Anticipated Data Products
Aubourg, Éric; Strauss, Michael A.; Anderson, Scott F. +324 more
We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). The LSST design is driven by four main science themes: probing dark energy and dark matter, taking an inventory of the solar system, exploring the transient optical sky, and mapping the Milky Way. LSST will be a large, wide-fiel…
Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics beyond ΛCDM
Casertano, Stefano; Riess, Adam G.; Yuan, Wenlong +2 more
We present an improved determination of the Hubble constant from Hubble Space Telescope (HST) observations of 70 long-period Cepheids in the Large Magellanic Cloud (LMC). These were obtained with the same WFC3 photometric system used to measure extragalactic Cepheids in the hosts of SNe Ia. Gyroscopic control of HST was employed to reduce overhead…
Overview of the DESI Legacy Imaging Surveys
Castander, Francisco J.; Gaztanaga, Enrique; Bell, Eric F. +158 more
The DESI Legacy Imaging Surveys (http://legacysurvey.org/) are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing-Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will jointly image ≈14,000 deg2 of the extragalactic sky visible from the northern h…
PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
Harding, A. K.; Ray, P. S.; Wood, K. S. +18 more
Neutron stars are not only of astrophysical interest, but are also of great interest to nuclear physicists because their attributes can be used to determine the properties of the dense matter in their cores. One of the most informative approaches for determining the equation of state (EoS) of this dense matter is to measure both a star’s equatoria…
Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
Smolec, R.; Dotter, Aaron; Zhang, Michael +14 more
We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics (MESA). RSP is a new functionality in MESAstar that models the nonlinear radial stellar pulsations that characterize RR Lyrae, Cepheids, and other classes of variable stars. We significantly enhance numerical energy conservation cap…