Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..288c&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 93, June-July 1981, p. 288-290.
Astronomy and Astrophysics
Astronomy
46
Nebulae, Red Giant Stars, Stellar Luminosity, Stellar Spectra, Bipolarity, Hydroxyl Emission, Infrared Stars, Interstellar Masers, Late Stars, Line Spectra, Stellar Spectrophotometry, Water Masers
Scientific paper
A spectral classification for the exciting star of the bipolar reflection nebula OH 0739-14, which has also been observed to be an OH/H2O maser source, is obtained from the spectrum of the nebulosity in the range 6000-9000 A. Spectrophotometry of the visible nebula was obtained with the Cassegrain image-tube scanner on the Lick Observatory 3-m telescope at a resolution of approximately 7 A. The red spectrum is found to be distinguished by TiO absorption at the bandheads at 8206, 8303, 8432, 8442 and 8452 A and VO in the 7400 and 7900 A regions. On the basis of the depths of these bandheads and the K I 7699 A and Ca II infrared triplet, OH 0739-14 is determined to be of spectral type M9 III. The underlying star thus represents the coolest known star to occur in a bipolar system.
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