Stellar luminosity stability - Luminosity variations and light curve period changes in BY Draconis stars

Details Stellar luminosity stability - Luminosity variations and light curve period changes in BY Draconis stars Stellar luminosity stability - Luminosity variations and light curve period changes in BY Draconis stars

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..802h&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, June 15, 1979, p. 802-814. Research supported by the Smithsonian Institution;

Astronomy and Astrophysics

Astrophysics

24

Convective Flow, Flare Stars, Late Stars, Light Curve, M Stars, Stellar Atmospheres, Stellar Luminosity, Energy Transfer, Fourier Analysis, Inhomogeneity, Least Squares Method, Stellar Models, Stellar Spectrophotometry, Time Series Analysis, Variable Stars

Scientific paper

The implications for convection in late type stars arising from the observations of BY Draconis type variability are examined. The possibility that the total luminosity of such a star is not constant is emphasized, and further observational tests to better define the variability are suggested. An alternative to standard spot models is explored in which the 'missing' flux from 'dark' spots is temporally redistributed; this model makes definite predictions about the correlation of mean light and color, and about the quiescent (i.e., unspotted) magnitudes of BY Draconis stars. The time scales of the long-period variability of these stars appear to require secular changes in convective energy transport. Consideration is given to the evidence for period changes in the optical light curves, and it is concluded that the reality of such changes is far less certain than previously claimed.

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