Statistics – Computation
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..307d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 1, 1984, p. 307-314.
Statistics
Computation
9
Star Distribution, Stellar Rotation, Calcium, Computational Astrophysics, Interferometry, Line Of Sight, Planetary Systems, Radii, Sunspots
Scientific paper
Stellar rotation periods recently determined from short-term variations in Ca II H and K emission-line flux associated with starspot activity can be combined with both rotational spectral-line-broadening velocity measurements and independent measurements of stellar radii to give the inclination of the star's rotation axis to the line of sight. Assuming that the limits of distribution of sunspots on the sun apply similarly to solar-type stars, interferometric measurements of stellar radii in Ca II H and K flux may be performed to determine the clock-like, on-the-plane-of-the-sky orientation as well. Various stellar-radius measuring techniques are discussed, and photon limits on the measurability of this latter parameter are derived for Ca II H and K speckle interferometry. The accuracy with which the space orientation of stars can be determined is discussed in the context of existing data as well as photon limits. The importance of determining the space orientation of stars is then discussed, with emphasis on its important application to the present search for extrasolar planetary systems.
Doyle Laurance R.
Lorre Jean J.
Wilcox Thomas J.
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