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Title: High resolution spectroscopy of the R Coronae Borealis star, V854 Centauri, during a deep minimum
Authors: Kameswara Rao, N
Lambert, D. L
Keywords: Absorption spectra;Astronomical spectroscopy;Emission spectra;R coronae borealis stars;Charge coupled devices;Chromosphere;High resolution;Nebulae;Photosphere;Spectral line width;Spectral resolution
Issue Date: May-1993
Publisher: American Astronomical Society
Citation: Astronomical Journal, Vol. 105, No. 5, pp. 1915 - 1926
Abstract: 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.
ISSN: 0004-6256
Appears in Collections:IIAP Publications

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