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An Optical and UV Investigation of the IRAS Seyfert Galaxy 1319-164
Hutchings, J. B.; De Robertis, M. M.; Pitts, Ronald E.
We present optical and UV spectroscopy, and optical-imaging observations of the bright IR-selected Seyfert galaxy 1319 - 164. We find that the nucleus is reddened by E_B-V_ = 0.3 mag, both in the lines and continuum. The galaxy is large and contains little, if any, spiral structure. There are low-brightness structures at about 5" from the nucleus,…
Chromospherically Active Stars. IV. HD 178450=V478 LYR: an Early-Type BY Draconis Type Binary
Fekel, Francis C.
The variable star HD 178450 = V478 Lyr is a chromospherically active G8 V single-lined spectroscopic binary with a period of 2.130514 days. This star has strong ultraviolet emission features and a filled-in Hα absorption line which is variable in strength. It is classified as an early-type BY Draconis system and is similar in many respects to the …
Hot White Dwarfs, OB Subdwarfs, and Dark Clouds
Bessell, M. S.; Wickramasinghe, D. T.; Wegner, Gary +1 more
The authors describe a method of using UBV photographic photometry to survey obscured regions in the Galactic plane for hot white dwarfs and OB subdwarfs. From an initial survey of two regions, the first towards the Coalsack, and the second covering part of the Scorpius-Centaurus cloud, the authors have found at least six white dwarfs, one probabl…
ISM Chemical Abundances in Two Intermediate-Velocity Clouds in the Line of Sight to SN 1987A
Bohm-Vitense, Erika; Morgan, Siobahn
The earliest IUE high-resolution spectra of SN 1987A have been studied and reveal the presence of several clouds in the line of sight to the LMC. In particular, there are two clouds with radial velocities of ~ 130 km s^-1^ and ~ 180 km s^-1^. These clouds' velocities are between those of Galactic clouds at 0-80 km s^-1^ and those of LMC gas at ~27…
IUE Observations of Stars in the Neighborhood of the Lambda Orionis Nebula
Bergoffen, Martin J.; van Buren, Dave
The authors present the results of an IUE archive study of five stars along the line of sight towards the λ Orionis H II region. H I, Fe II, Si II, and Mn II column densities have been found using a profile-fitting technique for H I and the curve-of-growth method for the ions. HD 36861 and HD 36822 lie at or near the center of the H II region, whi…
Optical and UV Spectroscopy of the Black Hole Binary Candidate LMC X-1
Thompson, I. B.; Bianchi, L.; Hutchings, J. B. +2 more
Both further optical spectroscopy of the binary star identified with LMC X-1, obtained between 1983 and 1985, and a series of IUE UV spectra taken during a 5 day interval in 1984 are presented. The optical data are used to refine the orbital period to 4.2288 days, and improved orbital parameters are derived. The velocity of the optical emission li…
Morphology and Nuclear Spectroscopy of Markarian 231
Hutchings, J. B.; Neff, S. G.
Deep optical imaging of Mkn 231 reveals twin (tidal?) tails, a linear nuclear feature at green wavelengths, and a very blue region 4 arcsec south of the nucleus. Much of the central part of the galaxy is red, but there are complex areas of blue luminosity outside this, and a sharp edge to the luminosity at a distance of about 16 arcsec from the ce…
Chromospheric and Transition-Region Emission from Young Solar-Type Stars in Clusters, Kinematic Groups, and the Field
Soderblom, David R.; Clements, Sandra D.
We have examined the strength of chromospheric and transition-region emission in solar-type stars that have been suggested to be members of the Ursa Major Group and Hyades Group (originally selected on kinematic grounds), as well as stars in the Hyades Cluster and other young stars of the solar neighborhood. We find that indices of the Ca II (R'
The SN Stars: Magnetically Controlled Stellar Winds Among the Helium-Weak Stars
Shore, Steven N.; Brown, Douglas N.; Sonneborn, George
The authors report observations of magnetically controlled stellar mass outflows in three helium-weak sn stars: HD 21699 = HR 1063, HD 5737 = α Scl, and HD 79158 = 36 Lyn. IUE observations show that the C IV resonance doublet is variable on the rotational timescale but that there are no other strong-spectrum variations in the UV. Magnetic fields, …
Anomalous Dust in the Open Cluster Trumpler 37
Fitzpatrick, Edward L.; Clayton, Geoffrey C.
New IUE data were obtained towards stars in the open cluster Trumpler 37. Extinction curves derived from these data show that the anomalous dust detected towards HD 204827 and HD 210072 is not unique to those lines of sight but occurs generally in that region of the sky. The dust is apparently associated with the Trumpler 37 cluster, which forms t…