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Interstellar C2 Toward X Persei (HD 24534)

Kaczmarczyk G.

Acta Astronomica

2000

Vol. 50, No. 1

151--162

Interstellar C2 bands D-X (2313 Å) and F-X (1342 Å) in the spectrum of X Per were detected in the archive echelle spectra acquired by the Goddard High Resolution Spectrograph (GHRS) aboard the Hubble Space Telescope. The population of C2 rotational levels was determined from the rotational lines in the D-X band to obtain kinetic temperature Tk=45±15 K. The total C2 column density N(C2)=(3.4±0.5)×1013 cm-2 was calculated using the D-X band with f-value of 0.0545. The analysis of F-X band with an adopted f-value of 0.1 gave different population of rotational levels of C2. Possible reasons of this discrepancy are discussed. The FWHM of the C2 line profile was estimated to be ΔV=2.7±1.0 km/s.