Spatially resolved spectroscopy of AG Carinae, and direct evidence for stellar evolution: The central star of NGC 2392

Details Spatially resolved spectroscopy of AG Carinae, and direct evidence for stellar evolution: The central star of NGC 2392 Spatially resolved spectroscopy of AG Carinae, and direct evidence for stellar evolution: The central star of NGC 2392

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993arcl.rept.....a&link_type=abstract

Final Report, 8 Jun. 1992 - 7 Jun. 1993 Applied Research Corp., Landover, MD.

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Blue Stars, Emission Spectra, Planetary Nebulae, Stellar Luminosity, Stellar Radiation, Ultraviolet Spectra, Cosmic Dust, Iue, Reflectance, Stellar Envelopes, Stellar Evolution, Stellar Mass

Scientific paper

We have performed spatially-resolved low dispersion long-slit spectroscopy for the circumstellar shell of the luminous blue variable AG Carinae with IUE between lambda lambda 1200 - 3200 A. At all positions a strong dust-scattered stellar continuum is detected. Only a few emission lines, FE II 2600 and O I (?) 1304, have been detected; the emission is stronger on the southern side of the shell. The UV surface brightness and derived dust properties are completely consistent with the groundbased and KAO FIR observations: the grains are large (0.1 - 1 micron), warm (45 - 100 K depending on composition), highly reflecting (Csca/Cabs approximately equal to 1), and tie up about 10-4 to 10-3 solar mass of material. We also observe similarities of the results for HR Car and LBV's to those reported here.

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