A Search for Molecular Absorption Features in the Photospheric Spectra of Cool Stars

Details A Search for Molecular Absorption Features in the Photospheric Spectra of Cool Stars A Search for Molecular Absorption Features in the Photospheric Spectra of Cool Stars

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1907w&link_type=abstract

IUE Proposal ID #CSFRW

Physics

Scientific paper

The primary goal of the proposed research program is to establish the existence of molecular features in the IUE spectra of cool stars. The identification and measurement of bands from the diatomic molecules commonly found in atmospheres of stars later than GO can provide important information about their photospheres. Various molecular bands are much more sensitive to changes in temperature, gas pressure (and thus luminosity) or elemental abundance ratios than atomic lines and their response to changes in these parameters can be measured with substantially lower spectral resolution. Detection of molecular bands in IUE spectra of cool stars is not straightforward since bands present in the faint continua can easily be hidden or distorted by the numerous atomic photospheric absorption and chromospheric emission lines. However, molecular information can be extracted from these spectra by analyzing sequences (based on temperature, luminosity, and carbon abundance) of low resolution spectra in conjunction with high resolution spectra of many of the same stars. This process will hopefully allow us to identify and measure molecular features in a wide range of late-type stars, including normal giants from K0 to M8 and a representative sample of carbon stars.

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