Other
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...34s&link_type=abstract
NOAO Proposal ID #1999A-0034
Other
Scientific paper
We plan to investigate one of the most important open questions regarding the diffuse interstellar bands (DIBs), using the KPNO coude feed telescope and its moderade-resolution camera (Camera 5). The issue at hand is whether or not the DIBs require high far-UV flux levels to form efficiently. Nearly all of the existing data on the DIBs are based on spectroscopic measurements toward O and B stars, which have local H II regions where ample UV photon fluxes are present. But despite existing studies which show no dependence of DIB behavior on stellar spectral type, and other studies which which show a weakness of the DIBs in nebulous regions excited by far-UV flux, there remains some question about whether or not the DIB carriers require significant UV flux. This question is especially timely in view of a recent DIBs formation model in which a two-photon process in H_2 molecules is thought to form the DIBs (this model requires a very high far-UV photon flux and therefore will be vitiated if the DIBs are found to form in sightlines toward cool stars). Our proposed observations require six nights on the coude feed telescope, using Camera 5 to obtain a spectral resolving power of (lambda)/(Delta)$(lambda) 20,000 and S/N levels >=50, in the spectra of a number of F5 and G5 stars identified as being at least moderately reddened. Unreddened comparison stars will be observed as well, to ensure that we have removed stellar photospheric line contamination.
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