000001894 001__ 1894
000001894 005__ 20160701171655.0
000001894 0247_ $$2DOI$$a10.1093/mnras/261.1.1
000001894 037__ $$aASTROimport-51
000001894 100__ $$aBalona, L. A.
000001894 245__ $$aThe extraordinary early-type eclipsing binary HR 2680
000001894 260__ $$c1993
000001894 520__ $$aPhotometric observations of the HR 2680 (B5V) star using Stromgren-b and Stromgren-uvby filters carried out in 1990 and 1991 are reported. It is found that this star is a single-line spectroscopic binary showing partial or annular eclipses with a period of 8.1 d. A light variation with an amplitude of 0.03 mag can be seen outside eclipse which can be interpreted as two oscillations, with approximate periods of about 1.19 and 1.28 d, but the periods are not constant. It is suggested that the star is a member of the 53 Per class of line-profile variables. The extraordinary variability of HR 2680 outside eclipse makes this star unique. It is suggested that the star could be used as a test bed for stellar dynamics and nonradial pulsations. 
000001894 700__ $$a Cuypers, J.
000001894 773__ $$c1-10$$pMonthly Notices of the Royal Astronomical Society$$v261$$y1993
000001894 85642 $$ahttp://esoads.eso.org/abs/1993MNRAS.261....1B
000001894 905__ $$apublished in
000001894 980__ $$aREFERD