On the Zero-Point Problem in Photometry of Active Late-Type Stars

Details On the Zero-Point Problem in Photometry of Active Late-Type Stars On the Zero-Point Problem in Photometry of Active Late-Type Stars

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996iraj...23...41z&link_type=abstract

Irish Astronomical Journal, 1996, 23(1), 41

Astronomy and Astrophysics

Astronomy

Scientific paper

Photometric and spectroscopic variability of active late-type stars are frequently interpreted as evidence for magnetic activity analogous to solar activity. In particular, cool, dark spots with enhanced photospheric magnetic fields are invoked to explain the photometric variability, as well as aspects of spectroscopic variations. In this contribution, problems linked with photometric diagnosis of a uniformly distributed spot-belt in active late-type stars are examined. Absolute and relative narrow-band photometry in specified spectral regions are suggested for these purposes. The method relies on systematic differences in observed quantities of non-active field stars and active stars.

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