Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10700963 | Chinese Astronomy and Astrophysics | 2005 | 11 Pages |
Abstract
A simple two-temperature model is developed to investigate the effect of stellar spots on the apparent magnitude and apparent lithium abundance of the star. For appropriate coverage factors, stellar spots can cause considerable variations in the apparent magnitude (about ±0.2 mag in V band and about â0.1 mag in BâV band) and equivalent width of LiI λ6708Ã
(about â0.2â0.3 dex). In comparison with normal, spot-free stars, spotty stars exhibit bluer BâV colours, and narrower LiI λ6708Ã
lines. Form the observed amplitude of luminosity variation, the change of spot coverage on the apparent disk ÎFs can be estimated to range from a few percent to 20%, hardly ever exceeding 30%.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Astronomy and Astrophysics
Authors
Xiong Da-run, Deng Li-cai,