Search Publications
A Correction for GALEX Spectroscopic UV Flux Distributions from Comparisons with CALSPEC and IUE
Bianchi, Luciana; Bohlin, Ralph C.
The CALSPEC database of absolute spectral energy distributions (SEDs) from the Hubble Space Telescope is based on pure hydrogen model atmosphere calculations for three unreddened white dwarf stars and represents the current UV flux calibration standard with a precision approaching 1% for well observed stars. Following our previous work to correct …
Surface mechanical properties of comet 67P
Krüger, H.; Knapmeyer, M.; Fischer, H. -H. +1 more
We give an overview of the mechanical properties of the surface material of comet 67P/Churyumov-Gerasimenko, as measured with the Surface Electric Sounding and Acoustic Monitoring Experiment instruments within the Rosetta/Philae mission. The data yielded information on the compression strength and the elastic modulus of the surface material and of…
Material Charging Investigations for Solar Orbiter
Polsak, A. W.; Delacourt, B.; Dias, N. +1 more
Absolute parameters of young stars: V454 Carinae
Demircan, O.; Özkardeş, B.; Erdem, A. +4 more
We present combined photometric and spectroscopic analyses of the multiple star V454 Carinae. High-resolution spectra of the system were taken at the University of Canterbury Mt. John Observatory during the years 2008-18. These have been processed using generic and purpose-built software. New digital single lens reflex photometry of the system has…
Hierarchical Bayesian approach for estimating physical properties in nearby galaxies: Age Maps (Paper II)
Bland-Hawthorn, Joss; Pérez, Enrique; Cerviño, Miguel +3 more
One of the fundamental goals of modern astrophysics is to estimate the physical parameters of galaxies. We present a hierarchical Bayesian model to compute age maps from images in the H α line (taken with Taurus tunable filter, TTF), ultraviolet band (GALEX far UV, FUV), and infrared bands (Spitzer 24, 70, and 160 µm). We present the burst a…
The data processing pipeline for the Herschel1- HIFI instrument
Shipman, R. F.; Edwards, K.; Kester, D. +2 more
The HIFI data processing pipeline was developed to systematically process diagnostic, calibration and astronomical observations taken with the HIFI science instrument as part of the Herschel mission. The HIFI pipeline processed data from all HIFI observing modes within the Herschel automated processing environment, as well as, within an interactiv…
Variable Stars in Sagittarius Globular Clusters. I. Arp 2
Pritzl, Barton J.; Smith, Horace A.; Catelan, Márcio +3 more
We present new photometry and analysis of the twelve variable stars (nine RR Lyrae (RRL), three SX Phoenicis (SX Phe)) belonging to the Sagittarius globular cluster Arp 2. Of the nine RRL stars in the cluster, eight are RRab and one is RRc. From the RRab stars, we determined a mean period of < {P}{ab}> =0.581+/- 0.047 days, where …
V404 CYG/GS 2023+338: Monitoring in the Optical with Robotic Telescopes of the MASTER Global Network during the 2015 Superburst
Rebolo, R.; Buckley, D. A. H.; Giovannelli, F. +23 more
2070 unique, homogeneous photometric and polarization observations of the microquasar in a binary system with a black hole V404 Cyg/GS2023+338 obtained in 2015 with the MASTER global network of robotic telescopes (16 robotic telescopes located at eight points on the Earth in Russia, Spain, South Africa, and Argentina) are presented. MASTER was the…
Local activity of comets: an indicator of non-uniform composition
Kossacki, Konrad J.; Czechowski, L.
In this paper, we investigate the conditions for the local ejection of a metamorphosed surface layer of material from a comet. We have calculated the strengthening of the material of the nucleus of comet 67P/Churyumov-Gerasimenko and the increase of gas pressure in pores. We are interested in the boundary between the regions Anhur and Bes, where a…
Astrometric investigation of visual binaries at Pulkovo
Romanenko, L. G.; Kalinichenko, O. A.
In the last 40 years the team headed by A.A. Kiselev at Pulkovo determined the orbits of 65 wide visual binaries and multiple stars. In most of the cases these studies are based on series of photographic observations made with the 26-inch refractor of Pulkovo observatory. Positional observations from Washington Double Star Catalog (WDS) were used …