Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confe..10g&link_type=abstract
"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 10-10"
Astronomy and Astrophysics
Astrophysics
Scientific paper
It is known, that solar type stars with nearby giant planets which have short orbital period, may show evidences of chromospheric activity. One of these, perhaps, is variability of the strongest chromospheric lines: H and K Ca II. This implies that it is possible to expect optical variability in B and R photometrical bands. We suspect that the variability of the mentioned chromospheric lines was caused by tidal forces of giant planets. So, we carried out BVR CCD-photometry of HD 187123, HD 68988, HD168746, which are systems containing extrasolar planets with short orbital periods. The photometry was obtained at Crimean Astrophysical Observatory (Ukraine) with the help of 38-cm Cassegrain telescope. The light curves of these third stars denoting on the possible variability in chromospheric lines are manifested, analysis of photometric observations is presenting, including periodogram analysis, using DFT (Discrete Fourier Transformation). Also, tasks for future research in this field are discussed.
Golovin Alex V.
Krushevska Viktoriia N.
Kuznyetsova Yuliana G.
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