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UV Spectra of the Eclipsing LMC X-Ray Binary CAL 87
Hutchings, J. B.; Crampton, D.; Cowley, A. P. +1 more
UV spectra of the supersoft x-ray binary CAL 87 have been obtained with the Faint Object Spectrograph of the HST. Eight spectra were obtained in 1995 January in a continuous observation covering the eclipse, from orbital phase 0.65 to 0.02. Interstellar extinction is modeled and removed to measure the system luminosity. The disk bolometric luminos…
Absolute Magnitudes and Colors of A-F Supergiants from Near-Infrared Features. II. The Galactic Sample
Peterson, Deane M.; Slowik, Donald J.
In this paper we extend the calibration of the infrared oxygen triplet at λ7774 Å as a luminosity indicator in A and F supergiants. We add five members of southern Galactic clusters to the nine northern objects previously considered, and find them completely consistent with the earlier relations. The result is a substantially improved fit between …
Rotationally Resolved Studies of the Mid-Ultraviolet Spectrum of Triton. II. HST Surface and Atmospheric Results
Stern, S. Alan; Trafton, Laurence M.; Flynn, Brian
Using the Hubble Space Telescope (HST) we have obtained useful spectra of Triton at a resolution of 2 Å from 1900-3278 Å, at five rotational phases in 1992 and 1993. We present these data and analyze them to evaluate the rotational variability of Triton's mid-ultraviolet reflectance spectrum, albedo, and color slope. The main characteristics of Tr…
A Multiwavelength Investigation of the Merging Galaxy HCG 95C
Papaderos, P.; Schultz, A.; Fink, U. +7 more
The compact group HCG 95 consists of four galaxies in which two of the members, HCG 95a and HCG 95c, are interacting. The morphology suggests the interaction is well evolved with the Northern tidal arm of HCG 95c overlapping the Eastern edge of HCG 95a. A linear bridge connecting the two galaxies hints at nuclear activity within HCG 95c. Our color…
Faint Object Spectrograph Observations of MRK 509: Ultraviolet Absorption Lines Near the Redshift of the Seyfert Galaxy
Crenshaw, D. Michael; Wu, Chi-Chao; Boggess, Albert
Ultraviolet spectra of the Seyfert 1 galaxy Mrk 509 have been obtained with the Faint Object Spectrograph on the Hubble Space Telescope. The spectra show strong absorption lines in the cores of the redshifted emission lines of Lyα and C IV λλ1548.2, 1550.8, confirming an earlier detection in IUE high-dispersion spectra, and a new detection of stro…
Evidence for Mass Outflow from the Nucleus of M101: Knots, Rings, and a Geyser
Geisler, D.; Moody, J. W.; Joner, M. D. +5 more
Hα on-line and off-line CCD images of M101 obtained with the Canada-France-Hawaii 3.6 m telescope show the presence of two Hα bright, filled knots paired linearly across the nucleus in a north-south orientation. The knots are centered 2.4" (85 pc, assuming a distance to M101 of 7.4 Mpc) from the nucleus and lie roughly perpendicular to an east-wes…
Optical and Far-UV Study of the Field of the Source EUVE J1027+323
Bowyer, Stuart; Lieu, Richard; Henry, J. Patrick +3 more
We have carried out optical and far-UV studies of the field around the EUV source EUVE JI027+323. We find two objects which contribute to this flux which are spatially unresolvable with EUVE. One is a noncataloged QSO and one is a hidden hot white dwarf. The relative contribution of each of these to the total EUV flux is uncertain; reasonable scen…
Field Distortions in the CPC2 Plate Data
Zacharias, N.
Residuals of a conventional plate adjustment of 5,687 plates of the Second Cape Photographic Catalogue (CPC2) using the Southern Reference Star (SRS) Catalog were analyzed to search for systematic errors depending on the location of the star images on the plate. Even after correcting for third order optical distortion, such coordinate depending sy…
Hubble Space Telescope Observations of Cool White Dwarf Stars: Detection of New Species of Heavy Elements
Koester, D.; Hammond, G.; Shipman, H. L. +11 more
Observations of cool white dwarf stars with the Hubble Space Telescope (HST) has uncovered a number of spectral features from previouslly unobserved species. In this paper we present the data on four cool white dwarfs. We present identifications, equivalent width measurements, and brief summaries of the significance of our findings. The four stars…
The UV Spectrum of the QSO OQ 172 Observed with the Faint Object Spectrograph
Cohen, Ross D.; Junkkarinen, Vesa T.; Lyons, R. W. +2 more
Low resolution far-UV spectra of the high redshift QSO OQ 172 (Z_e_ = 3.544) have been obtained with the prism and the G160L grating of the Faint Object Spectrograph on board the Hubble Space Telescope. Light is detected down to a rest wavelength near 325 A where the spectrum appears to be cut off, possibly by a Lyman limit system. This cutoff is …