Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1915k&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1915-1926.
Other
39
Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, R Coronae Borealis Stars, Charge Coupled Devices, Chromosphere, High Resolution, Nebulae, Photosphere, Spectral Line Width, Spectral Resolution
Scientific paper
The R Coronae Borealis star V854 Cen was observed at minimum light (V about 15) at high spectral resolution from 5480 to 7070 A. The spectrum consists of three components: a continuum devoid of photospheric lines, a collection of sharp emission lines of Sc II, Ti II, Y II, and Ba II, and broad emission lines of forbidden O I, forbidden N II, forbidden S II, H-alpha, Na D, and C2 Swan bands. A low resolution spectrum reveals additional lines of Ca II, forbidden C I, and other species. The sharp emission lines are considered to be chromospheric lines. The broad lines with a full width of 400-500 km/s come from an extended region with a temperature of about 7000 K, but an electron density of 50/cu cm or less. It is suggested that V854 Cen may be a bipolar nebula.
Kameswara Rao N.
Lambert David L.
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