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Theta Circini (t Cir), is a star located in the constellation Circinus. Theta Circini is also known as HR 5551, and HD 131492. The star is a spectroscopic binary. The system is located at Right Ascension 14h 56m 44s and Declination -62 deg 46 arcmin 51 arcsec.〔 The system has a combined apparent visual magnitude of +5.11,〔 and is located 255 parsecs (833 light years) from the Sun. Theta Circini A and B are both B4V dwarf stars with effective temperatures of 15000 Kelvin. Each has an apparent visual magnitude +5.9, and an absolute magnitude of -1.96 and a mass of 3.2 solar masses. The components are separated by 0.1 arcsec. The system is notable for having three peculiar characteristics: its spectra, brightness variations, and stellar pulsations. The star is classified as an H-Alpha variable for its spectral variations. It is classified (due to the orbital characteristics), as a Gamma Cassiopeia variable. Finally, it is considered to be a BE Lacertae variable star, exhibiting massive pulsations. == References == *http://www.alcyone.de/cgi-bin/search.pl?object=HR5551 *http://server3.wikisky.org/starview?object_type=1&object_id=2046 *http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+5551&submit=SIMBAD+search *http://varsao.com.ar/Curva_theta_Cir.htm (light curve) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Theta Circini」の詳細全文を読む スポンサード リンク
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