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The Cassini Cosmic Dust Analyzer
Grande, M.; Krivov, A. V.; Kempf, S. +41 more
The Cassini-Huygens Cosmic Dust Analyzer (CDA) is intended to provide direct observations of dust grains with masses between 10-19 and 10-9 kg in interplanetary space and in the jovian and saturnian systems, to investigate their physical, chemical and dynamical properties as functions of the distances to the Sun, to Jupiter a…
A Galactic O Star Catalog
Walborn, Nolan R.; Maíz-Apellániz, Jesús; Galué, Héctor Á. +1 more
We have produced a catalog of 378 Galactic O stars with accurate spectral classifications that is complete for V<8 but includes many fainter stars. The catalog provides cross-identifications with other sources; coordinates (obtained in most cases from Tycho-2 data); astrometric distances for 24 of the nearest stars; optical (Tycho-2, Johnson, a…
Faint Galaxies in Deep Advanced Camera for Surveys Observations
Infante, L.; Zheng, W.; Feldman, P. D. +33 more
We present the analysis of the faint galaxy population in the Advanced Camera for Surveys (ACS) Early Release Observation fields VV 29 (UGC 10214) and NGC 4676. These observations cover a total area of 26.3 arcmin2 and have depths close to that of the Hubble Deep Fields in the deepest part of the VV 29 image, with 10 σ detection limits …
The Cassini Ultraviolet Imaging Spectrograph Investigation
West, Robert A.; Lane, Arthur L.; Colwell, Joshua E. +16 more
The Cassini Ultraviolet Imaging Spectrograph (UVIS) is part of the remote sensing payload of the Cassini orbiter spacecraft. UVIS has two spectrographic channels that provide images and spectra covering the ranges from 56 to 118 nm and 110 to 190 nm. A third optical path with a solar blind CsI photocathode is used for high signal-to-noise-ratio st…
ISO spectroscopy of disks around Herbig Ae/Be stars
van den Ancker, M. E.; Acke, B.
We have investigated the infrared spectra of all 46 Herbig Ae/Be stars for which spectroscopic data are available in the ISO data archive. Our quantitative analysis of these spectra focuses on the emission bands at 3.3, 6.2, ``7.7'', 8.6 and 11.2 micron, linked to polycyclic aromatic hydrocarbons (PAHs), the nanodiamond-related features at 3.4 and…
Discovery of a Transient Magnetar: XTE J1810-197
Safi-Harb, Samar; Hurley, Kevin; Kouveliotou, Chryssa +10 more
We report the discovery of a new X-ray pulsar, XTE J1810-197, that was serendipitously discovered on 2003 July 15 by the Rossi X- Ray Timing Explorer (RXTE) while observing the soft gamma repeater SGR 1806-20. The pulsar has a 5.54 s spin period, a soft X-ray spectrum (with a photon index of ~4), and is detectable in earlier RXTE observations back…
Resistive Emergence of Undulatory Flux Tubes
Aulanier, G.; Schmieder, B.; Pariat, E. +3 more
During its 2000 January flight, the Flare Genesis Experiment observed the gradual emergence of a bipolar active region, by recording a series of high-resolution photospheric vector magnetograms and images in the blue wing of the Hα line. Previous analyses of these data revealed the occurrence of many small-scale, transient Hα brightenings identifi…
Resolution of the MACHO-LMC-5 Puzzle: The Jerk-Parallax Microlens Degeneracy
Gould, Andrew
By extending the constant-acceleration analysis of Smith, Mao, & Paczyński to include jerk, I show that microlens parallax measurements are subject to a four-fold discrete degeneracy. The new degeneracy is characterized by a projected velocity vj=-(3/4)cscβec(cos2ψsin2βec+sin2ψ)3/2v⊕, wher…
Interstellar Carbon in Translucent Sight Lines
Sofia, Ulysses J.; Meyer, David M.; Lauroesch, James T. +1 more
We report interstellar C II column densities or upper limits determined from weak absorption of the 2325.4029 Å intersystem transition observed in six translucent sight lines (AV>~1) with the Space Telescope Imaging Spectrograph (STIS). The sight lines sample a wide range of interstellar characteristics, including total to selective …
The Effect of Metallicity on Cepheid-based Distances
Ferrarese, Laura; Saha, Abhijit; Sakai, Shoko +1 more
We have used the Wide Field Planetary Camera 2 on board the Hubble Space Telescope to obtain V and I images of seven nearby galaxies. For each, we have measured a distance using the tip of the red giant branch (TRGB) method. By comparing the TRGB distances with published Cepheid distances, we investigate the metallicity dependence of the Cepheid p…