New radio detections of early-type pre-main-sequence stars

Details New radio detections of early-type pre-main-sequence stars New radio detections of early-type pre-main-sequence stars

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357l..39s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 357, July 10, 1990, p. L39-L43.

Astronomy and Astrophysics

Astronomy

20

Early Stars, Pre-Main Sequence Stars, Radio Astronomy, Emission Spectra, Radio Emission, Stellar Winds, Synchrotron Radiation, Very Large Array (Vla)

Scientific paper

Results of VLA radio continuum observations of 13 early-type pre-main-sequence stars selected from the 1984 catalog of Finkenzeller and Mundt are presented. The stars HD 259431 and MWC 1080 were detected at 3.6 cm, while HD 200775 and TY CrA were detected at both 3.6 and 6 cm. The flux density of HD 200775 has a frequency dependence consistent with the behavior expected for free-free emission originating in a fully ionized wind. However, an observation in A configuration suggests that the source geometry may not be spherically symmetric. In contrast, the spectral index of TY CrA is negative with a flux behavior implying nonthermal emission. The physical mechanism responsible for the nonthermal emission has not yet been identified, although gyrosynchrotron and synchrotron processes cannot be ruled out.

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