Radio and X-ray emission from main-sequence K stars

Details Radio and X-ray emission from main-sequence K stars Radio and X-ray emission from main-sequence K stars

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264l..31g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. L31-L34.

Astronomy and Astrophysics

Astrophysics

28

K Stars, Main Sequence Stars, Radio Emission, Stellar Radiation, X Rays, Binary Stars, Late Stars, Radio Spectra, Stellar Coronas, Stellar Luminosity, Stellar Spectra

Scientific paper

A small VLA radio continuum survey of 12 selected active, main-sequence K stars is presented. The targets are uniformly distributed between spectral types K0 and K8; five are single stars, five are spectroscopic binaries, and two are visual binaries. All targets are within 25 pc and were selected based on strong X-rays, rapid rotation, or strong Ca II emission lines. Seven targets were detected at the observing frequency of 8.5 GHz (3.6 cm), while sensitive upper limits are reported for the nondetections. The radio luminosities are comparable to active M dwarfs. Radio and X-ray luminosities LR and LX fulfil a relation that was previously found for M dwarfs, with LR varies as LX over 3 orders of magnitude. We further find that the more rapidly rotating K dwarfs are stronger radio emitters, irrespective of spectral type.

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