The spectrum of the symbiotic star YY HER

Details The spectrum of the symbiotic star YY HER The spectrum of the symbiotic star YY HER

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..410h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 2, June 1984, p. 410-412.

Astronomy and Astrophysics

Astrophysics

2

Binary Stars, Stellar Spectra, Stellar Spectrophotometry, Supergiant Stars, Ultraviolet Spectra, Absorption Spectra, Balmer Series, Emission Spectra, Hydrogen, Spectrum Analysis, Stellar Envelopes, Stellar Luminosity, Stellar Temperature

Scientific paper

Spectroscopic observations, covering the λλ3600 - 5000 Å region, of the symbiotic star YY Her are reported. The absorption spectrum of the cool component of the star shows high luminosity features, corresponding to a late G supergiant: tentatively a spectral type G8 Iab is attributed. The velocity of YY Her derived from absorption lines is about -27 km s-1. The emission lines are due to hydrogen, He I, He II, N III, [O III] and [Ne III] etc. The Balmer lines are separated into two components by a deep blue-shifted reversal. The high excitation emission lines are relatively weak. There is a large difference of velocity between different excitation emissions and the two components of the Balmer lines indicating a conspicuous stratification structure of the envelope of this object.

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