Radio continuum emission from the pre-main sequence Herbig AE star AB Aurigae

Details Radio continuum emission from the pre-main sequence Herbig AE star AB Aurigae Radio continuum emission from the pre-main sequence Herbig AE star AB Aurigae

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217l...9g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

20

A Stars, B Stars, Continuous Radiation, Pre-Main Sequence Stars, Radio Emission, Stellar Mass Ejection, Radio Spectra, Stellar Magnetic Fields, Very Large Array (Vla)

Scientific paper

Two Herbig Ae stars have been observed in the radio range with the Very Large Array for the first time. One of these stars, HD 250550, was not detected, while the other object, AB Aur, was detected twice at 3.6 cm and once at 6 cm. A slight time variation was found at 3.6 cm, and its flux agrees with free-free emission of a thermal wind source having M-dot = 1.5 x 10 to the -8th solar mass/yr (assuming an expansion velocity of 400 km/s) compatible with quasi-simultaneous optical line observations. The radio spectrum, however, deviates from a simple nu exp 0.6-law, showing excess radiation at 6 cm. The possibility exists that it originates from nonthermal electrons emitting synchrotron radiation in a magnetic field.

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