Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.312..794k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 312, Issue 4, pp. 794-806.
Astronomy and Astrophysics
Astronomy
7
Molecular Processes, Methods: Numerical, Ism: Abundances, Ism: Clouds, Ism: Molecules
Scientific paper
Data on molecular CO in absorbing gas towards X Per, from the International Ultraviolet Explorer (IUE) and the echelle mode of the Goddard High Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope, are reported. A statistical equilibrium model is used to recreate equivalent widths of CO bands and reproduce high-resolution GHRS spectra. The CO column density N(CO)=(1.0+/-0.2)x1016cm-2] is determined by the approximation of observed GHRS high-resolution spectra. The result is repeated using equivalent widths of CO bands (the IUE and GHRS data). The cloud pressure (Pk~2500+/-500Kcm-3) and full width at half-maximum (FWHM) of the line profile of the cloud (ΔV=1.6+/-0.2kms-1) are obtained by approximation of GHRS spectra. Synthetic spectra are created and compared with GHRS spectra. The data show that the cloud has more complex structure, and at least a two-component approximation should be used to obtain more accurate results.
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