The rotational discontinuity shown by luminosity class IV stars

Details The rotational discontinuity shown by luminosity class IV stars The rotational discontinuity shown by luminosity class IV stars

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...298..756g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 298, Nov. 15, 1985, p. 756-760. Research supported by the University of Wes

Astronomy and Astrophysics

Astrophysics

67

Stellar Evolution, Stellar Rotation, Turbulence, Astronomical Catalogs, Dynamo Theory, Stellar Spectra, Zeeman Effect

Scientific paper

Spectroscopic data with high signal-to-noise ratio were analyzed for rotation and macroturbulence in a sample of 20 F-, G-, and K-class IV stars. Near GO IV, a sudden drop in rotation is seen with advancing spectral type, in complete analogy to the drop seen at G5 III in the giants. Rotation of tens of km/sec is common in the F subgiants, but all the G and K subgiants in the observed sample rotate more slowly than 4 km/per sec. The rotation (v sin i) slowly decreases from about 4 km/sec at G0 IV to about 2.5 km/sec at K2 IV. The macroturbulence values decrease monotonically with advancing spectral type and lie between similar relations for luminosity classes III and V.

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