Orion-2 - First scientific results

Astronomy and Astrophysics – Astronomy

Scientific paper

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Soyuz Spacecraft, Spaceborne Astronomy, Spectral Energy Distribution, Stellar Spectrophotometry, Ultraviolet Spectroscopy, Astronomical Photography, B Stars, Planetary Nebulae, Satellite-Borne Instruments, Spaceborne Telescopes, Stellar Luminosity, U.S.S.R. Space Program

Scientific paper

Preliminary results of observations of the UV spectra of weak stars (9th to 12th magnitude) in the 2000 to 5000 A range made from the Orion-2 observatory on board Soyuz-13. About 10,000 spectrograms of more than 3000 stars were obtained over 5 days with a meniscus telescope and objective prism. Data are presented for a group of about 20 previously uncataloged stars detected around Capella, in Auriga; more than 20 Type B stars in Vela; emission stars with spectral lines assigned to such metals as iron, chromium, nickel, cobalt, and others; interstellar absorption at 3000 to 2000 A in the spectrum of SAO 040183, probably due to blocking of emission lines excited in the stellar gaseous envelope; the doublet of 2800 Mg II in stellar spectra; the chromospheres of cold stars; and the UV spectrogram of the planetary nebula NGC II 2149. The possibility of classifying stars according to their continuous spectra is discussed.

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