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Title:
Doppler Imaging of spotted stars - Application to the RS Canum Venaticorum star HR 1099
Authors:
Vogt, S. S.; Penrod, G. D.
Affiliation:
AA(Lick Observatory, Santa Cruz, CA), AB(Lick Observatory, Santa Cruz, CA)
Publication:
(Astronomical Society of the Pacific, Symposium on the Renaissance in High-Resolution Spectroscopy - New Techniques, New Frontiers, Kona, HI, June 13-17, 1983) Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Sept. 1983, p. 565-576. (PASP Homepage)
Publication Date:
09/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BINARY STARS, IMAGING TECHNIQUES, STARSPOTS, CORONAL HOLES, DOPPLER EFFECT, LINE SPECTRA, MAPPING, STELLAR ROTATION
DOI:
10.1086/131208
Bibliographic Code:
1983PASP...95..565V

Abstract

A technique for imaging the surfaces of certain rapidly rotating spotted stars is discussed. The method exploits the correspondence between wavelength position across a rotationally broadened spectral line and spatial position across the stellar disk. Preliminary Doppler Images of the RS CVn star HR 1099 show spots which exhibit a striking similarity in shape and location to X ray images of solar coronal holes. It is suggested that the large star spots on RS CVn's and other active late-type stars emerge at low latitude as scaled-up analogs of solar complexes, but as they migrate poleward, they more closely resemble photospheric analogs of solar coronal holes. The evolution of starspots appears remarkably similar to that of large-scale magnetic fields of the sun.

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