Complex Lines in the Spectrum of RW Cephei.
Abstract
The spectrum of this extreme supergiant M-type star observed with dispersion of 9 A/mm shows many absorption lines apparently with two components separated by a narrow central maximum. The maximum is probably actual emission superposed on an absorption line considerably widened by turbulence. In certain lines, especially the resonance lines of Ca i, Cr i, Mn 1, and Sr ii, the shortward component is greatly reinforced by the absorption of an upper expanding shell of gas. Shortward of X 4000 A there appear numerous narrow emission lines, chiefly of Fe i and Ti 1, without accompanying dark lines. The peculiar relative intensities of these lines are probably due to strong differential . The spectrum is compared with that of a Orionis.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1956
- DOI:
- 10.1086/146178
- Bibcode:
- 1956ApJ...123..392M