000001879 001__ 1879
000001879 005__ 20160701171654.0
000001879 037__ $$aASTROimport-36
000001879 100__ $$avan Genderen, A. M.
000001879 245__ $$aA pulsating star inside η Carinae. I. Light variations, 1992-1994.
000001879 260__ $$c1995
000001879 520__ $$aWe present and analyze two seasons of intense photometric monitoring in the Stroemgren uvbyHß system of η Carinae (October 1992-August 1994). The luminous blue variable (LBV) in the core did not show much S Dor activity, i.e. it was in a relatively quiescent stage. This situation was very favourable for studying its optical micro variations. It appears that the central LBV pulsates (presumably in a non-radial mode) like other massive evolved stars, the a Cyg variables. The quasi-period is 58.56d. The linear ephemeris is: JD_max_ = 2448875.0 +58.56 E. Support was found for the existence of the presumed periodicity of 52.4d of the so-called "dimples", shallow dips in the light curve which only last for a few days. The cause may be the eclipse of a small companion or of a hot spot in an accretion disk. The Hß index became bluer by ~0.07mag during the last 11/2 years and shows an oscillation in anti-phase with the 58.56d pulsation, suggesting that the HII region(s) responsible for the hydrogen line emission has a relatively high luminosity. This is another reason to suppose that a second luminous source, perhaps a luminous disk (with a hot spot), may be present in the η Car system. 
000001879 700__ $$a Sterken, C.
000001879 700__ $$a de Groot, M.
000001879 700__ $$a Stahl, O.
000001879 700__ $$a Andersen, J.
000001879 700__ $$a Andersen, M. I.
000001879 700__ $$a Caldwell, J. A. R.
000001879 700__ $$a Casey, B.
000001879 700__ $$a Clement, R.
000001879 700__ $$a Corradi, W. J. B.
000001879 700__ $$a Cuypers, J.
000001879 700__ $$a Debehogne, H.
000001879 700__ $$a Garcia de Maria, J. M.
000001879 700__ $$a Jonch-Sorensen, H.
000001879 700__ $$a Vaz, L. P. R.
000001879 700__ $$a Stefl, S.
000001879 700__ $$a Suso Lopez, J.
000001879 700__ $$a Beele, D.
000001879 700__ $$a Eggenkamp, I. M. M. G.
000001879 700__ $$a Goecking, K.-D.
000001879 700__ $$a Jorissen, A.
000001879 700__ $$a de Koff, S.
000001879 700__ $$a Kuss, C.
000001879 700__ $$a Schoenmakers, A. P.
000001879 700__ $$a Vink, J.
000001879 700__ $$a Waelde, E.
000001879 773__ $$c415$$pAstronomy and Astrophysics$$v304$$y1995
000001879 85642 $$ahttp://esoads.eso.org/abs/1995A%26A...304..415V
000001879 905__ $$apublished in
000001879 980__ $$aREFERD