Detection of a stellar prominence of the K supergiant 32 CYG

Details Detection of a stellar prominence of the K supergiant 32 CYG Detection of a stellar prominence of the K supergiant 32 CYG

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124l..16s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 2, Aug. 1983, p. L16-L18.

Astronomy and Astrophysics

Astrophysics

21

K Stars, Prominences, Stellar Mass Ejection, Supergiant Stars, Chromosphere, Density (Mass/Volume), Iue, Light Curve, Opacity, Rayleigh Scattering

Scientific paper

Light curves at various UV wavelengths have been determined from a sequence of high resolution IUE spectra taken around the 1981 eclipse of 32 Cyg B. Attention is given to the first detection of a stellar prominence of the K supergiant, seen as a transient absorption of the B star continuum flux whose mechanism is probably Rayleigh scattering at the HI ground state which follows from the wavelength dependence of optical depths. The prominence has a typical density of 10 to the 12th/cu cm, while the density contrast relative to the surrounding chromosphere is of the order of a factor of 10. In the case where magnetic fields balance the excess prominence pressure, a field of about 4 Gauss would be required.

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