Near-infrared spectroscopy of proto-planetary nebulae

Details Near-infrared spectroscopy of proto-planetary nebulae Near-infrared spectroscopy of proto-planetary nebulae

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...420..783h&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 2, p. 783-796

Astronomy and Astrophysics

Astronomy

56

Infrared Astronomy, Infrared Spectroscopy, Near Infrared Radiation, Nebulae, Protoplanets, Absorption Spectra, H Lines, K Lines, Stellar Evolution, Supergiant Stars

Scientific paper

Sixteen proto-planetary nebulae were observed with low-resolution infrared spectroscopy in the H and K bands, and four were observed in the L band. In the H band, most of the objects show hydrogen Brackett lines (from n = 10 goes to 4 to n = 20 goes to 4) in absorption. In the K band, absorption bands (delta (nu) = 2) of CO were observed to as high as nu = 6 goes to 4, and in three cases the CO bands are in emission. The CO spectrum of 22272 + 5435 was found to change from emission to absorption over a 3 month interval. The CO emission most likely arises from collisional excitation resulting from recent episodes of mass loss. One new object which possibly shows weak 3.3 micron emission was found.

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