The perplexing spectrum of AFGL 2789 /V645 CYGNI/

Details The perplexing spectrum of AFGL 2789 /V645 CYGNI/ The perplexing spectrum of AFGL 2789 /V645 CYGNI/

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237l..17h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 237, Apr. 1, 1980, p. L17-L20. NASA-NSF-USAF-supported research.

Astronomy and Astrophysics

Astronomy

27

Cygnus Constellation, Infrared Astronomy, Infrared Spectra, Nebulae, Stellar Envelopes, Stellar Spectrophotometry, A Stars, Absorption Spectra, Line Spectra, Molecular Spectra, Spectral Energy Distribution, Ultraviolet Absorption

Scientific paper

Visual spectra and photometry from 0.35 to 18 microns show that AFGL 2789 may be one of the most interesting of the infrared sources now identified with reflection nebulae. It has an Ae-type shell spectrum with strong emission lines of hydrogen, Fe II, Cr II, and Ti II, but the most remarkable feature is a broad absorption band near 5500 A, presumably molecular, with three possible band heads. This absorption band was present on only one of two spectra taken one night apart. The two known molecules with wavelengths closest to the observed band heads are C2 and H2O(+), although there are problems with either of these as possible identifications.

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