A study of the Herbig Ae-type stars UX ORI and CD-44 deg 3318 based on IUE spectra, and on visual and infrared photometry

Details A study of the Herbig Ae-type stars UX ORI and CD-44 deg 3318 based on IUE spectra, and on visual and infrared photometry A study of the Herbig Ae-type stars UX ORI and CD-44 deg 3318 based on IUE spectra, and on visual and infrared photometry

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...134..273t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 134, no. 2, May 1984, p. 273-283.

Astronomy and Astrophysics

Astrophysics

41

A Stars, Hertzsprung-Russell Diagram, Infrared Photometry, Irregular Variable Stars, Iue, Stellar Envelopes, Stellar Spectrophotometry, Visual Photometry, Infrared Radiation, Pre-Main Sequence Stars, Spectral Energy Distribution, Supergiant Stars

Scientific paper

The spectral classifications of the two Herbig Ae stars UX Ori and CD-44 deg 3318 are reconsidered. The far-UV spectra of the stars are both similar to those of early A-type supergiants; however, the spectral types A2 III and A0-1 III are here derived for the respective stars based on continuum shapes, absorption features, and distance arguments. Along with existing and new photometric data, the revised classifications are used to derive intrinsic spectral energy distributions for the two stars, and the results are applied to locate their positions on the Hertzsprung-Russell diagram. The parameters of the dust shells around the stars are estimated, as are the emission line surface fluxes in the IUE spectra of CD-44 deg 3318. The luminosity classification and the differences in the emission line fluxes of the two stars are discussed.

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