Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...180..160l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 180, no. 1-2, June 1987, p. 160-166.
Astronomy and Astrophysics
Astronomy
23
Astronomical Photometry, Astronomical Spectroscopy, Hydroxyl Emission, Infrared Astronomy, Infrared Stars, Planetary Nebulae, Asymptotic Giant Branch Stars, Charge Coupled Devices, Infrared Astronomy Satellite, Mass Transfer, Spectral Energy Distribution, Stellar Spectra
Scientific paper
Optical and infrared, photometric and spectroscopic observations of two type-II OH/IR sources, OH/IR 17.7-2.0 and OH/IR 286.50+0.06, are presented. The first object is shown to be non-variable, or only slightly variable. The central star is probably of spectral type K1 - K4, and embedded in a non-spherical shell of dust. It appears to be in an intermediate stage between the Asymptotic Giant Branch and the Planetary Nebula ones. The second object, OH/IR 286.50+0.06, is variable with a period near 600 days. At maximum, it has a spectral type M9. If at a distance of 8.3 kpc, its total luminosity is 1.5×105L_sun;, and its mass loss rate 1.5×10-5M_sun;yr-1. It appears to be an extreme member of the Mira class, at the upper end of the Asymptotic Giant Branch.
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