Search Publications
Multiphase High-Velocity Gas Detected within 7 kpc Toward the M13 Globular Cluster
Welsh, Barry Y.; Lallement, Rosine; Wheatley, Jonathan
We present medium-resolution ultraviolet interstellar absorption measurements recorded with the HST-COS and FUSE spectrographs toward the post-AGB star Barnard 29 in the M13 globular cluster. Inspection of the UV spectra has revealed absorption at in the absorption profiles of the C I, C II, , C IV, N I, N II, N V, O I, ALII, Si II, Si IV, S II an…
A Morphological Study of UV-Bright Stars and Emission Nebulae in a Selection of Star Formation Regions in M31
Krienke, O. Karl; Hodge, Paul W.; Luciana, Bianchi
Using the data from the NOAO Local Group Survey, we have measured the Hα fluxes of 291 nebulae associated with 21 of the van den Bergh OB associations. We have combined these data together with six-color HST WFPC2 photometry, in order to identify the most UV-bright stars in the region. The simple purpose of this article is to explore the spatial r…
The Amazing Old Nova Q Cygni: A Far-Ultraviolet Synthetic Spectral Analysis
Kolobow, Craig; Sion, Edward
Q Cygni (Nova Cygni 1876) is the third-oldest old novae (after WY Sge and V841 Oph), with a long orbital period of 10.08 hr and spectroscopic peculiarities in the optical, including the presence of variable wind outflow revealed by optical P Cygni profiles in the He i lines and Hαβ. We have carried out a synthetic spectral analysis of a far-ultrav…
A Far-Ultraviolet Spectroscopic Analysis of BZ Ursae Majoris
Sion, Edward M.; Godon, Patrick; Gänsicke, Boris T. +1 more
We present an analysis of the Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) far-ultraviolet snapshot spectrum of the dwarf nova BZ UMa taken during quiescence. We find that the flux continuum is consistent with that of a white dwarf atmosphere with a temperature of 15,000 K, a projected rotational velocity of 200 km/s, non…
Laboratory and In-Flight Measurements at 10-55 K of InSb Near-Infrared Detector Performance for the Warm Mission of the AKARI Satellite
Oyabu, Shinki; Kaneda, Hidehiro; Ishihara, Daisuke +2 more
The warm mission phase of AKARI, the Japanese infrared astronomical satellite, has started after its 180 liter liquid helium cryogen was exhausted. Since then, we have conducted near-infrared observations with the Infrared Camera (IRC), while the telescope is slowly warming up. To explore the possibility of continuing observations at higher temper…
A Method to Identify and Characterize Binary Candidates—A Study of CoRoT Data
Da Silva, Ronaldo; Silva-Valio, Adriana
The analysis of the CoRoT space mission data was performed aiming to test a method that selects, among the several light curves observed, the transiting systems that likely host a low-mass star orbiting the main target. The method identifies stellar companions by fitting a model to the observed transits. Applying this model, which uses equations s…
Modern Observations of Hubble’s First-discovered Cepheid in M31
Sabo, R.; Harris, B.; Henden, A. +9 more
We present a modern ephemeris and modern light curve of the first-discovered Cepheid variable in M31, Edwin Hubble’s M31-V1. Observers of the American Association of Variable Star Observers (AAVSO) undertook these observations during the latter half of 2010. The observations were in support of an outreach program by the Space Telescope Science Ins…
Lossy Compression of Weak-Lensing Data
Massey, Richard; Rhodes, Jason; Bernstein, Gary M. +4 more
Future orbiting observatories will survey large areas of sky in order to constrain the physics of dark matter and dark energy using weak gravitational lensing and other methods. Lossy compression of the resultant data will improve the cost and feasibility of transmitting the images through the space communication network. We evaluate the consequen…
An Empirical Pixel-Based Correction for Imperfect CTE. I. HST’s Advanced Camera for Surveys
Anderson, Jay; Bedin, Luigi R.
We use an empirical approach to characterize the effect of charge-transfer efficiency (CTE) losses in images taken with the Wide-Field Channel of the Advanced Camera for Surveys (ACS). The study is based on profiles of warm pixels in 168 dark exposures taken between 2009 September and October. The dark exposures allow us to explore charge traps th…
On the Stellar Content of the Carina Dwarf Spheroidal Galaxy
Walker, A. R.; Prada Moroni, P. G.; Degl'Innocenti, S. +20 more
We present deep, accurate, and homogeneous multiband optical (U, B, V, I) photometry of the Carina dwarf spheroidal galaxy, based on more than 4000 individual CCD images from three different ground-based telescopes. Special attention was given to the photometric calibration, and the precision for the B, V, and I bands is generally better than 0.01…