Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225l..71b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Oct. 15, 1978, p. L71-L74.
Astronomy and Astrophysics
Astrophysics
19
B Stars, Balloon-Borne Instruments, Metastable State, Stellar Mass Ejection, Ultraviolet Spectroscopy, Ground State, High Resolution, Shell Stars, Spectral Resolution, Stellar Models, Stellar Spectrophotometry
Scientific paper
Three strong asymmetric absorption features with short-wavelength wings extending 350 km/s from their respective line centers at 2061.6, 2068.2, and 2079.0 A appear in high-resolution UV spectral data (0.1 A) for the Be star Phi Per (B2 Ve4) obtained with the Balloon-borne Ultraviolet Stellar Spectrometer (BUSS) on the evening of September 16, 1976. These transitions are not resonance lines and have been identified as transitions of Fe III (UV 48) originating from a metastable state with an excitation of 5.01 eV. The relative populations of the metastable and ground states are independent of the dilution factor, allowing calculation of the mass-outflow rate for a generalized model. Thus, a mass-outflow rate of 5 hundred-billionths of a solar mass per year is obtained. These transitions are observable with IUE and represent an important tool for studying mass outflow in Be and shell stars.
Bruhweiler Fred C.
Morgan Thomas H.
van der Hucht Karel A.
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