Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..774b&link_type=abstract
The Astrophysical Journal, vol. 430, no. 2, pt. 1, p. 774-778
Astronomy and Astrophysics
Astronomy
6
Blue Stars, Infrared Spectra, Line Spectra, Nebulae, Radio Sources (Astronomy), Stellar Luminosity, Supergiant Stars, Supernova Remnants, Cosmic Dust, Hydrogen Ions, Infrared Astronomy, Radio Emission, Spectrum Analysis, Stellar Temperature
Scientific paper
We have obtained infrared images and infrared spectroscopy of the Galactic radio source G25.5+0.2, previously suggested to be a young supernova remnant. The 2.2 micrometers image exhibits a similar nebular structure to that seen in the radio. Spectroscopic measurements at 2.17 micrometers show a Br gamma line that has the line-to-continuum ratio expected from ionized hydrogen at a temperature near 10,000 K. The line is resolved and has a total extent of 300 km/s. Ten micron photometry clearly establishes a physical connection between G25.5+0.2 and the IRAS source 18344-0632. Most important, the infrared image reveals a point source in the center of the nebula that has properties of a blue supergiant star that could excite an ionized ring nebula with the observed radio properties. G25.5+0.2 is almost certainly a ring nebula around a mass losing luminous blue star approximately 13.5 kpc distant and reddened by 20 mag of visual extinction.
Becklin Eric E.
Geballe Thomas Ronald
McLean Ian S.
Zuckerman Ben
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