Search Publications
Reddening and Star Formation in Starburst Galaxies
Calzetti, Daniela
The reddening properties and the star formation history of a sample of 19 starburst galaxies are investigated using multiwavelength spectroscopy and infrared broad band photometry. New photometric data in the J, H, and K bands of the central starburst regions are supplemented with previously published spectra, covering the wavelength range 0.12-2.…
UV Spectral Classification of O and B Stars in the Small Magellanic =
Bruhweiler, Frederick C.; Smith Neubig, Margaret M.
We present an ultraviolet classification system for 0 and B stars of the Small Magellanic Cloud (SMC). This system is defined by a set of standard, low resolution, International Ultraviolet Explorer (JUE) spectra. This UV classification system results from the development of spectral sequences demonstrating systematic patterus of UV spectral featu…
UIT: Ultraviolet Observations of the Small Magellanic Cloud
Parker, Joel Wm.; O'Connell, R. W.; Bohlin, R. C. +9 more
A mosaic of four UIT far-UV (FUV) (lambda_ {eff} = 1620 Angstroms) images, with derived stellar and HII region photometry, is presented for most of the Bar of the SMC. The UV morphology of the SMC's Bar shows that recent star formation there has left striking features including: a) four concentrations of UV-bright stars spread from northeast to so…
Ultraviolet Imaging of the Globular Cluster 47 Tucanae
O'Connell, Robert W.; Bohlin, Ralph C.; Landsman, Wayne B. +8 more
We have used the Ultraviolet Imaging Telescope to obtain far-UV (1620 Å), wide field (40' diameter) images of the prototypical metal-rich globular cluster 47 Tucanae. We find a population of about 20 hot (Teff>9000 K) objects near or above the predicted UV luminosity of the hot horizontal branch (HB) and lying within two half-light r…
The Orbit of the Classical Cepheid V350 SGR
Evans, Nancy Remage; Sugars, Benjamin J. A.
We have obtained velocities for the binary Cepheid V350 Sgr at the David Dunlap Observatory. An orbit has been derived combining these data with velocities from the literature. The spectral type of B9.0 V has been confirmed from an IUE spectrum, leading to a mass of the companion of 2.5 Msun . The uncertainty in the mass is also discussed.
RY Persei: an Early-Type Interacting Close Binary
Olson, Edward C.; Plavec, Mirek J.
We have analyzed photometric and spectroscopic data for the totally-eclipsing binary RY Persei. It is a semidetached binary of the Algol type. However, both the gainer (B4: V) and the loser (F7: II-III) are significantly more massive (6.25 and 1.6 M_sun), hotter, and more luminous (Mbol about -3.3 and -0.2 mag, respectively) than a typi…
Ongoing Mass Ejection in the Peculiar, Hot Do Degenerate KPD 0005+5106
Sion, Edward M.; Barstow, Martin A.; Holberg, Jay B. +1 more
We present an analysis of four high-resolution far-ultraviolet spectra of the hot, peculiar DO white dwarf KPD 0005+5106 obtained with short-wavelength prime (SWP) spectrograph aboard the International Ultraviolet Explorer (lUE) spacecraft. These spectra reveal weak, probably variable, peculiar absorption and emission transitions of ultrahigh exci…
An Ultraviolet View of Massive Star Formation in Seyfert Host Galaxies.
O'Connell, Robert W.; Bohlin, Ralph C.; Smith, Andrew M. +5 more
We present deep vacuum ultraviolet (λλ 1200-3300 Å) imagery of four Seyfert galaxies observed by the Ultraviolet Imaging Telescope (UIT): NGC 1068, NGC 2992, NGC 4151, and Mrk 335. These data have a spatial resolution of ∼3" and a limiting surface brightness of ∼24.5 mag arcsec-2 The host galaxies display a diverse range in ultraviolet …
IUE and Voyager Observations of the Unusual Cataclysmic Variable S193
Garnavich, Peter; Szkody, Paula; Holberg, Jay +2 more
UV observations of S193 were obtained with Voyager and the IUE satellite during both high and low states of this unusual object. Voyager only detected the source during the high state, where the continuum looks similar to the novalike IX Vela and dwarf novae at outburst. The IUE spectra at the high state show deep absorption lines, but the line ra…