Ultraviolet spectra of stars and nebulae ("Orion-2").
Abstract
The paper reviews recent results derived from analysis of stellar UV spectrograms obtained in the wavelength range from 2000 to 3800 A with a wide-angle meniscus telescope and objective prism aboard the Orion 2 space observatory. Detailed attention is given to the continuous UV energy distribution of hot stars, continuum blocking by UV absorption lines, the continuum depression at 2800 A, the structure of the UV continuum of Gamma Cas, effects of UV emission-line blending, interstellar absorption in the ultraviolet, the UV energy distribution of Eta Ori, and an unusual group of high-temperature low-luminosity stars in Auriga. The behavior of the Mg II doublet at 2800 A in stellar spectra is examined along with anomalous A2 stars, chromospheres of cold stars, spectral classification according to UV spectrograms, and the nature of the UV spectra of F, G, and K stars. UV spectra of the planetary nebula IC 2149 and its central star are also evaluated
- Publication:
-
Stars and Galaxies from Observational Points of View
- Pub Date:
- 1976
- Bibcode:
- 1976sgov.meet...33G
- Keywords:
-
- Planetary Nebulae;
- Spaceborne Telescopes;
- Stellar Spectra;
- Ultraviolet Spectra;
- Continuous Spectra;
- K Stars;
- Spaceborne Astronomy;
- Stellar Temperature;
- Astronomy