X marks the SPOT - Distribution and excitation of unidentified molecules in the Red Rectangle

Details X marks the SPOT - Distribution and excitation of unidentified molecules in the Red Rectangle X marks the SPOT - Distribution and excitation of unidentified molecules in the Red Rectangle

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..698s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. 698-704.

Astronomy and Astrophysics

Astrophysics

42

Astronomical Spectroscopy, Emission Spectra, Interstellar Matter, Molecular Excitation, Reflection Nebulae, Carbon, Cosmic Dust, Radiation Sources, Space Plasmas

Scientific paper

Results of new long-slit CCD spectroscopy throughout the biconical Red Rectangle (RR) nebula are presented. The intensity ratios of the unidentified sharp features at the emission lines 5800, 5826, 5855, 5880, and 5938 are found to be constant across the face of the RR within observational errors, suggesting a common emitter for all five features. The sharp features exhibit a measurably different spatial intensity distribution from that of the broadband ERE, indicating distinct but possibly related origins. The sharp features achieve maximum intensity either at or slightly inside (about 1 arcsec) the conical surfaces which apparently contain the bipolar outflow from the central object of the RR. The central wavelengths of the sharp features exhibit blue shifts of 2-5 A with increasing distance from the central star HD 44179, due primarily to asymmetric reductions in the FWHM values. It is argued that these shifts result from a decrease in the population of high rotational states of the emitting molecules with increasing distance from the excitation source.

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