Synchrotron radiation from the winds of O supergiants - TB = 10 to the 7.6th K at 60 stellar radii

Details Synchrotron radiation from the winds of O supergiants - TB = 10 to the 7.6th K at 60 stellar radii Synchrotron radiation from the winds of O supergiants - TB = 10 to the 7.6th K at 60 stellar radii

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359l..15p&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. L15-L18. Research supported by NSF.

Astronomy and Astrophysics

Astrophysics

7

Brightness Temperature, Nonthermal Radiation, O Stars, Stellar Winds, Supergiant Stars, Synchrotron Radiation, Angular Resolution, Radio Waves, Very Large Array (Vla), Very Long Base Interferometry

Scientific paper

Results are presented on VLBI measurements of the nonthermal radio components around two O supergiant stars: Cyg OB2 No. 9 and HD 167971. The measurements were used to characterize the brightness temperature of the emission and to measure the size of compact 5-10 mJy components in these stars, reported by Bieging et al. (1989). The sizes found for the 5-10 mJy components are consistent with the free-free wind radii, indicating that the compact companions are not the sources of nonthermal radiation. Results suggest that there is a small fractional population (10 to the -4th to 10 to the -7th) of ultrarelativistic electrons (Teff of about 10 to the 11th K) coexisting with the stellar wind, which emit optically thin synchrotron radiation. This is in agreement with the synchrotron model of White (1985).

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