Binary star speckle photometry. I - The colors and spectral types of the Capella stars

Details Binary star speckle photometry. I - The colors and spectral types of the Capella stars Binary star speckle photometry. I - The colors and spectral types of the Capella stars

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1056b&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Sept. 1988, p. 1056-1060.

Astronomy and Astrophysics

Astronomy

35

Binary Stars, Speckle Interferometry, Stellar Color, Stellar Spectra, Stellar Spectrophotometry, Stellar Magnitude, Stellar Orbits, Stellar Temperature

Scientific paper

Sets of speckle-interferometry frames of Capella taken in the Strömgren y,b, and v filters have been analyzed by means of the "Fork" algorithm to produce the intensity ratios of the components. The results show that the magnitude differences in y, b, and v are mAa - mAb = 0.09, 0.23, and 0.55, respectively. Thus, contrary to accepted beliefs, the more luminous star in these wavebands is the hotter Capella Ab, which is the spectroscopic secondary and the less massive component. The photometric indices are consistent with spectral types of G0 III for the secondary and G8/K0 III for the primary.

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