Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248..547s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 2, Aug. 1991, p. 547-554.
Astronomy and Astrophysics
Astronomy
24
F Stars, Infrared Sources (Astronomy), Planetary Nebulae, Stellar Evolution, Stellar Mass Ejection, Supergiant Stars, Asymptotic Giant Branch Stars, Emission Spectra, H Alpha Line, Infrared Astronomy Satellite, Stellar Envelopes, Stellar Spectrophotometry
Scientific paper
Photometric and spectroscopic observations of the cold infrared source IRAS 08005 - 2356 are presented. The infrared source is associated with a low-latitude F-type supergiant. Its optical spectrum shows strong H-alpha emission. In the red part of the spectrum numerous low excitation emission lines are present. H-alpha, H-beta and Na I D lines clearly show P Cyg profiles, indicative of mass loss from an extended stellar atmosphere. Near-infrared photometry reveals the existence of a hot (1200 K) circumstellar dust shell. IRAS 08005 - 2356 is identified as a photo-planetary nebula. Its present-day mass loss rate is at least 10 exp-6 solar mass/yr. At an estimated core mass of 0.6 solar mass this means that the object will turn into a planetary nebula within a 150 years. Evidence is presented for a fast wind from the star, with outflow velocities up to 400 km/s.
de Jong Teije
Hu Jiang-Yao
Slijkhuis Sander
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