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Title:
Studies of bipolar nebulae. VII - The exciting star of OH 0739-14 /equals OH 231.8 plus 4.2/
Authors:
Cohen, M.
Affiliation:
AA(NASA, Ames Research Center, Moffett Field, CA)
Publication:
Astronomical Society of the Pacific, Publications, vol. 93, June-July 1981, p. 288-290. (PASP Homepage)
Publication Date:
06/1981
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
NEBULAE, RED GIANT STARS, STELLAR LUMINOSITY, STELLAR SPECTRA, BIPOLARITY, HYDROXYL EMISSION, INFRARED STARS, INTERSTELLAR MASERS, LATE STARS, LINE SPECTRA, STELLAR SPECTROPHOTOMETRY, WATER MASERS
Comment:
A&AA ID. AAA030.134.007
DOI:
10.1086/130825
Bibliographic Code:
1981PASP...93..288C

Abstract

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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