Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448..426s&link_type=abstract
Astrophysical Journal v.448, p.426
Astronomy and Astrophysics
Astronomy
8
Radio Lines: Stars, Stars: Circumstellar Matter, Stars: Individual Alphanumeric: G25.5+0.2, Stars: Mass Loss
Scientific paper
We have obtained single-dish observations of the extremely broad radio recombination line (RRL) H42α at 85.688 GHz with the IRAM 30 m telescope and the 2.6 mm line of 12CO (J = 1-0) at 115.271 GHz with the NRAO 12 m telescope toward the Galactic object G25.5+0.2. We apply a non-LTE model to the available RRLs and determine the average physical conditions in the nebula surrounding the central source: electron number density, Ne = 8 × 104 cm-3; electron temperature, Te = 6150 K; and volume filling factor, f= 2 × 10-5. These results are consistent with a photoionized, optically thin shell that has been enriched by processed stellar material From the 12CO line profile, we find no evidence for an interaction between G25.5+0.2 and any molecular material. Our analysis supports the suggestion of Subrahmanyan et al. (1993) and Becklin et al. (1994) that G25.5+0.2 is an evolved, massive star with a thin shell of photoionized gas.
Churchwell Edward
Goss William Miller
Shepherd Debra S.
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