Spectroscopic observations of the symbiotic star AG Draconis

Details Spectroscopic observations of the symbiotic star AG Draconis Spectroscopic observations of the symbiotic star AG Draconis

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..733s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 195, June 1981, p. 733-742.

Astronomy and Astrophysics

Astronomy

17

Astrometry, Companion Stars, Stellar Spectra, Balmer Series, Emission Spectra, Helium

Scientific paper

Spectroscopic observations, covering the 3500-7000 A region, of the symbiotic star AG Draconis are reported. The Balmer and He I line profiles were found to show pronounced blueward asymmetries. Changes in the line profiles of the Balmer lines were observed, and found to be well correlated with the 554-day photometric period of Meinunger (1979), with a second, blueward component being visible in the Balmer emissions at photometric minimum. The weak, blueshifted component in the Balmer emission lines is explained in terms of a stellar wind from the hot secondary at about 60 km/s. The behavior of the broad emission feature at 6380 A has been investigated. This feature was found to originate from an iron with an ionization potential in the range 77-101 eV. Various models for AG Dra are discussed.

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