Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235...97e&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Jan. 1, 1980, p. 97-103. Research supported by the University of Texas.
Astronomy and Astrophysics
Astrophysics
14
Early Stars, H Alpha Line, Stellar Spectra, Variable Stars, Electron Scattering, Emission Spectra, Stellar Spectrophotometry, Stellar Winds, Supergiant Stars
Scientific paper
Observations of the Hα region of α Cam were obtained during 4 months in the winter of 1979 using modern electronic detectors on the two coudé spectrographs at McDonald Observatory. The P Cygni type emission profile at Hα is flanked by extensive, symmetric, nonvariable wings, which can be attributed to the effect of electron scattering in the emitting region. The low-velocity region of the emission core is highly variable, with changes being evident on a time scale of 6 hours to 1 day. The recurrence of similar profiles at multiples of the estimated rotation period suggests that the rotation of an inhomogeneous expanding envelope contributes to the observed variability. A weak, photo spheric absorption line of ionized helium shows no evidence of variability.
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