Transient emission events in the early Be star 59 Cygni

Details Transient emission events in the early Be star 59 Cygni Transient emission events in the early Be star 59 Cygni

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88...72b&link_type=abstract

Astronomical Journal, vol. 88, Jan. 1983, p. 72-87. Research supported by the Natural Sciences and Engineering Research Council

Astronomy and Astrophysics

Astronomy

9

B Stars, Binary Stars, Emission Spectra, Radiant Flux Density, Stellar Radiation, Variable Stars, Balmer Series, H Alpha Line, Image Intensifiers, Paschen Series, Red Shift, Stellar Envelopes, Stellar Spectrophotometry

Scientific paper

Intensifier-dissector-scanner observations are presented of renewed emission variability in the very early-type rapidly rotating speckle binary 59 Cygni; this activity marks the end of a five-year quiescent period following the shell episode of 1974-1975. Circumstellar envelope line profiles are extracted, and the Balmer and Paschen decrements are evaluated and compared to model calculations. The quasi-periodic V/R variations seen at H-alpha are dynamically inconsistent with the elliptical ring model for Be stars developed by Huang. Analysis of the Balmer-line bisector functions reveals a persistent redshift to H-alpha which is interpreted as evidence for expansion of the circumstellar envelope.

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