Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..497w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 1, 1986, p. 497-503.
Astronomy and Astrophysics
Astronomy
11
Binary Stars, Infrared Photometry, Infrared Sources (Astronomy), Planetary Nebulae, Astronomical Photometry, Astronomical Spectroscopy, Distance, Electron Energy, Helium, Infrared Astronomy, Interstellar Extinction
Scientific paper
Spectroscopy and JHKL photometry of the IRAS source 1912+172P09 are discussed. It has the outward characteristics of a young dense planetary nebula with a probable binary central star. The binary comprises a slightly evolved B9 star and a hot subdwarf which is responsible for the excitation of the nebula but is invisible. The possible relationship of the system to the yellow symbiotics is discussed. A high helium abundance [N(He)/N(H+) = 0.23] is determined for the nebula. If 1912+172 is indeed a planetary nebula, then the invisible hot subdwarf must have originally had a mass of order 3 M_sun;; such high mass progenitors are rare amongst the known planetary nebulae.
Menzies John W.
Whitelock Patricia A.
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