More on the lambda 2800 A 'interstellar extinction' feature

Details More on the lambda 2800 A 'interstellar extinction' feature More on the lambda 2800 A 'interstellar extinction' feature

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.109..399m&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 109, no. 2, Feb. 1985, p. 399-402.

Astronomy and Astrophysics

Astrophysics

1

Absorption Spectra, Exposure, Instrument Errors, Stellar Spectra, Ultraviolet Spectrometers, Interstellar Extinction, Iue, Magellanic Clouds

Scientific paper

In a response made to a recent letter by Karim et al. (1984), it is shown that the examples of interstellar absorption at 2800 A that they attribute to proteinaceous material can all be attributed to overexposure of IUE detectors. It is pointed out that stars in the Large Magellanic Cloud show pronounced absorption at 2800 A which cannot be due to interstellar protein since there is no associated absorption at 2200 A; this lack of absorption cannot be due to presence of graphite, whose absorption is weak in the Cloud. The claim by Karim et al. that the spectra of eight stars show 2800 A absorption and that these spectra are saturation-free is considered, and it is shown that data processing problems at IUE ground stations make these spectra unreliable.

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