Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..868s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. Vol. 263, No. 4, p. 868 - 874
Other
18
Stars: Variables: Other -- H Ii Regions -- Ism: Individual: G25.5+0.2 -- Ism: Jets And Outflows -- Radio Lines: Ism
Scientific paper
Using the Australia Telescope, the Galactic source G25.5+0.2 has been detected in broad H105α and H106α radio recombination lines. Subsequent observations with the Very Large Array detected the H92α transition. The width of the recombination line is about 200 km s-1, attributed to large-scale velocity structure. Infrared imaging and spectroscopy with the Anglo-Australian Telescope reveals a luminous central star with an absolute magnitude of MK ˜ -7 that is at least as hot as an O7 main-sequence star. The object is not a supernova remnant as was previously suggested. The authors interpret G25.5+0.2 as an unusually energetic ejection associated with a post-main-sequence star of very high mass. The exceptional thermal bremsstrahlung emission from the nebula is due to photoionization by the high Lyman continuum flux of the central star.
Allen David A.
Ekers Ron D.
Goss William Miller
Subrahmanyan Ravi
Wilson Warwick E.
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