Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..580a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 580-586.
Astronomy and Astrophysics
Astrophysics
4
Chromosphere, Stellar Activity, Stellar Color, Stellar Spectrophotometry, Triple Stars, Variable Stars, Hertzsprung-Russell Diagram, Stellar Rotation, Ubv Spectra, Variability
Scientific paper
The long-term photometric behavior of the triple system DH Leonis has been studied using the UBV data obtained between 1976 and 1990. The amplitude of the long-term brightness change is about 0.45 magnitudes in V, with an estimated cycle length of 8 to 14 yr, whereas the amplitude of the rotational modulation is about 0.15 magnitudes. In terms of starspots this means that the variation of spot coverage with longitude (and latitude) at a given time is less than the variation for the whole star over longer intervals of time. During minimum light the effective spotted area covers about 60 percent of the surface. The average B - V color of the system is correlated with the average brightness; the change in B - V corresponds to a change of about two spectral subtypes. It is found that there is more blue light in the system, especially during spot maximum, than expected from the spectral types of the components. Possible causes are discussed. The position of the components in the HR diagram is also discussed.
Akalin A.
Aslan Zafer
Derman Emanuel
Ozdemir T.
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