The UV extinction of HR 5999

Details The UV extinction of HR 5999 The UV extinction of HR 5999

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..318h&link_type=abstract

In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 318-321 (SEE N85-20961 1

Astronomy and Astrophysics

Astronomy

4

Interstellar Extinction, Stellar Spectra, Variable Stars, Dust, Graphite, Iue, Particles, R Coronae Borealis Stars, Stellar Atmospheres, Wavelengths

Scientific paper

The irregular Ae variable HR 5999 has been observed by IUE during a period of minimum light (7.4 ≤ Mv ≤ 7.7). By comparing these spectra with spectra of the star taken five years previously near maximum light (Mv ≡ 6.9) the authors have obtained a UV extinction curve. The shape of the curve as a function of wavelength does not resemble other extinction curves. A possible cause of the extinction could be 110 nm graphite particles in the star's atmosphere along the line of sight. It is proposed that this star is intermediate as a dust producer between other Ae and T Tauri stars, whose variability appears to be due to spotting, and R CrB variables where dust production is the cause of the light extinction.

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