A new method for determining the rotation of late spectral type stars

Details A new method for determining the rotation of late spectral type stars A new method for determining the rotation of late spectral type stars

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....93..235b&link_type=abstract

Astronomy and Astrophysics, vol. 93, no. 1-2, Jan. 1981, p. 235-240. Research supported by the Swiss National Science Foundatio

Astronomy and Astrophysics

Astrophysics

112

Astrometry, Late Stars, Stellar Rotation, Stellar Spectra, Calibrating, Cross Correlation, Spectrographs

Scientific paper

The cross-correlation between the spectrum of a cool star and an adequate mask located in the focal surface of the spectrograph is in a position to provide stellar rotation velocities. The efficiency of this method for determining radial velocities has long been known (Griffin, t967). The present work shows that this technique is in a position to provide stellar rotations simultaneously and with the same efficiency. The relationship between the width of the correlation function and V sin i is established for the spectrometer CORAVEL. A precision better than 1km s-1 on V sin i can be achieved with a 1-meter telescope within a few minutes for stars down to mB = 11m.0 to 13m.0.

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