Search Publications
O VI Recombination Lines in Ultraviolet and Visible Spectra of RR Telescopii
Young, P. R.
Nineteen recombination lines of O VI are identified in ultraviolet and visible spectra of the symbiotic nova RR Telescopii at wavelengths between 1122 and 6203 Å. Only three of the lines have previously been reported from astronomical spectra, and eight lines have never been reported from either astronomical or laboratory spectra. The lines repres…
Large distance of ɛ Aurigae inferred from interstellar absorption and reddening
Wolf, M.; Harmanec, P.; Zasche, P. +9 more
The long-period (P = 27.1 years) peculiar eclipsing binary ɛ Aur, which has recently completed its two year-long primary eclipse, has perplexed astronomers for over a century. The eclipse arises from the transit of a huge, cool and opaque, disk across the face of the F0 Iab star. One of the principal problems with understanding this binary is that…
Interpretation of COSAC mass spectrometer data acquired during Rosetta's Lutetia fly-by 10 July 2010
McKenna-Lawlor, Susan; Szopa, Cyril; Roll, Reinhard +6 more
On 10 July 2010 the Rosetta spacecraft flew-by asteroid Lutetia. At that time all the mass spectrometers in the payload of the Philae Lander capable of gas analysis were in operation. Among these, the COSAC (Cometary Sampling and Composition) experiment is a gas-chromatograph mass spectrometer which was switched on twice during the fly-by, once 3 …
Whistler mode bursts in the Venus ionosphere due to lightning: Statistical properties using Venus Express magnetometer observations
Russell, C. T.; Wei, H. Y.; Zhang, T. L. +2 more
The Venus Express mission has completed over four years in polar orbit about Venus with periapsis altitudes as low as 180 km. On each orbit around periapsis the fluxgate magnetometer samples the magnetic field at 128 Hz. The data reveal short-lived bursts with peak-to-peak amplitudes up to 1.5 nT in the frequency range 42 to 60 Hz. These signals a…
Spectropolarimetric signatures of anisotropic velocity distributions of optically thin coronal UV lines
Khan, A.; Landi Degl'Innocenti, E.
Context. Many interpretations of observations with the Ultraviolet Coronagraph Spectrometer (UVCS) operating aboard the Solar and Heliospheric Observatory (SOHO) have suggested that there are variations in particle velocity distributions. In this paper, we investigate their spectropolarimetric signatures.
Aims: We uncover the spectropolarimet…
Discovery of a Pulsar Wind Nebula Candidate in the Cygnus Loop
Katsuda, Satoru; Petre, Robert; Uchida, Hiroyuki +4 more
We report on a discovery of a diffuse nebula containing a pointlike source in the southern blowout region of the Cygnus Loop supernova remnant, based on Suzaku and XMM-Newton observations. The X-ray spectra from the nebula and the pointlike source are well represented by an absorbed power-law model with photon indices of 2.2 ± 0.1 and 1.6 ± 0.2, r…
On the Apsidal Motion of Thirteen Eclipsing Binaries
Zasche, P.
Main aim of this paper is the first light curve and apsidal motion analysis of thirteen eccentric eclipsing binaries and determination of their basic physical properties. All of the systems were studied by the method of period analysis of times of minima and the light curve analysis. Many new times of minima were derived and collected from the dat…
Probing cluster dynamics in RXC J1504.1-0248 via radial and two-dimensional gas and galaxy properties
Klein, M.; Schneider, P.; Verdugo, M. +1 more
We study one of the most X-ray luminous cluster of galaxies in the REFLEX survey, RXC J1504.1-0248 (hereafter R1504; zcl = 0.2153), using XMM-Newton X-ray imaging spectroscopy, VLT/VIMOS optical spectroscopy, and WFI optical imaging. The mass distributions were determined using both the so-called hydrostatic method with X-ray imaging sp…
A Panchromatic Catalog of Early-type Galaxies at Intermediate Redshift in the Hubble Space Telescope Wide Field Camera 3 Early Release Science Field
Holtzman, J. A.; O'Connell, R. W.; Walker, A. R. +24 more
In the first of a series of forthcoming publications, we present a panchromatic catalog of 102 visually selected early-type galaxies (ETGs) from observations in the Early Release Science (ERS) program with the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) of the Great Observatories Origins Deep Survey-South (GOODS-S) field. Our ET…
Staring at 4U 1909+07 with Suzaku
Wilms, J.; Pottschmidt, K.; Fürst, F. +4 more
We present an analysis of the neutron star high mass X-ray binary (HMXB) 4U 1909+07 mainly based on Suzaku data. We extend the pulse period evolution, which behaves in a random-walk like manner, indicative of direct wind accretion. Studying the spectral properties of 4U 1909+07 between 0.5 to 90 keV we find that a power-law with an exponential cut…