High-resolution spectroscopy of the hot RCrB star MV SGR

Details High-resolution spectroscopy of the hot RCrB star MV SGR High-resolution spectroscopy of the hot RCrB star MV SGR

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231..175j&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, March 1, 1988, p. 175-189.

Astronomy and Astrophysics

Astronomy

23

B Stars, Emission Spectra, Hot Stars, Stellar Spectra, Stellar Spectrophotometry, Gravitational Fields, Hydrogen, Metallicity, Radial Velocity, Stellar Temperature

Scientific paper

High-resolution spectroscopy of the hot R CrB star MV Sgr is presented. Obtained close to maximum light, blue spectra are sufficiently free of emission lines for several photospheric absorption lines to be resolved. An analysis of the photospheric spectrum indicates that MV Sgr is very similar to the extreme helium star HD 124448 in effective temperature, surface gravity and hydrogen abundance. There is some evidence for underabundances of 1 dex (relative to HD 124448) in N, S and Si, and 2 dex in C. The emission-line spectrum shows ions of Mg II, Ca II, Si I, Fe II, Ti II and He I. The emitting material has the same radial velocity as the star, and is also extremely hydrogen deficient. The metal emission lines are all optically thick.

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