Analysis of broad-band photometry of the long-period variables

Details Analysis of broad-band photometry of the long-period variables Analysis of broad-band photometry of the long-period variables

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976saosr.370.....p&link_type=abstract

SAO Special Report #370 (1976)

Physics

6

Broadband, Periodic Variations, Spectrum Analysis, Stellar Spectrophotometry, Brightness, Giant Stars, Infrared Radiation, Infrared Stars, Radii

Scientific paper

The variations of color with phase were studied for 166 Mira stars (spectrum M, S, and C) for which infrared observations and simultaneous visual estimates are available. The variations of color with phase, and of infrared magnitude with phase, were related to maximal spectrum and to period. A recalibration of the relation between effective temperature and the water-cell index of Pettit and Nicholson led to a radius variation that differs significantly from the one that they obtained. A relation between infrared color and surface brightness for nonvariable giant stars was derived; supergiants and Mira Ceti deviate from this relation, even when allowance is made for the dependence of radius on wavelength. It was concluded that the photometric determination of radius variations is unreliable, and the scale of effective temperatures highly uncertain.

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