Search Publications
Ultraviolet extinction towards far OB associations.
Perinotto, M.; Aiello, S.; Barsella, B. +2 more
Stars in the Aur OB-2 and Sco OB-1 associations, located in the direction of the galactic anticenter and center, respectively, have been observed for interstellar extinction. No effects due to changes of grain composition across such large distances are seen. A star exhibiting a peculiar extinction is found in each association. The properties of t…
Integrated Fluxes for Emission Lines in the Ultraviolet Spectra of Several Planetary Nebulae
Carpenter, K. G.; Czyzak, S. J.
The IUE satellite observatory has been used to obtain absolutely-calibrated emission line fluxes for diagnostic lines of multiply-ionized C, N, O, Si, Ne, and Ar which occur in the ultraviolet spectral region of planetary nebulae. These data, when combined with data from the blue, visual, and near infrared, will provide improved estimates of ionic…
Dependence on Reddening of Interstellar Column Densities in the Direction of O-Stars
Mentese, H. H.
We have investigated 14 O-type stars with IUE high resolution SWP spectra in order to improve the relations of element depletions withE(B-V), and to look for other possible relations with two stellar parameters: namely, the rate of mass loss and rotational velocity. The stars were chosen so as to cover several directions in the Galaxy, as well as …
An interactive procedure to solve the background subtraction problems in IUE high resolution spectra: application to the image SWP 4616.
Morossi, C.; Ramella, M.; Santin, P. +1 more
The standard BKG subtraction and blaze efficiency correction in IUE High Resolution Images are unsatisfactory. We have developed an interactive procedure to eliminate these well-known inadequacies. A background statistically constant and a constant point spread function perpendicular to the direction of the dispersion have been assumed. The validi…
Determination of the rotational excitation temperature in solar type stars.
Rego, M.; Fernandez-Figueroa, M. J.; Perea, A.
The OH molecular spectrum has been identified in three solar type stars, β Com, β CVn, and κ Cet. The rotational excitation temperature from molecular line intensities of OH has been determined for these stars. The observations in high resolution were made by use of the IUE satellite.
The Ability of Cos-B to Measure Gamma-Ray Bursts
Boella, G.; Gorisse, M.; Taylor, B. G. +2 more
The COS-B satellite for gamma-ray astronomy, launched on 7 August, 1975, features as part of the main instrument a 1.1 m2, 10 mm thick, plastic scintillator for the vetoing of charged particle events. This detector which has an average effective area of 360 cm2 for gamma rays in the interval 0.1 to 1 MeV has been instrumented…