ELLIPSOIDAL VARIABLE V1197 ORIONIS: ABSOLUTE LIGHT-VELOCITY ANALYSIS FOR KNOWN DISTANCE

摘要: V1197 Orionis light curves from a long-term observing program for red giant binaries show ellipsoidal variation of small amplitude in the V and RC bands, although not clearly U B. Eclipses are detected. All four bands large irregular intrinsic variations, including fleeting quasi-periodicities identified by power spectra, that degrade analysis may be caused dynamical tides generated orbital eccentricity. To deal with absence eclipses consequent lack astrophysical geometrical information, direct use is made Hipparcos parallax distance while (older) radial velocity analyzed simultaneously terms absolute flux. The giant's temperature estimated new spectra. This type analysis, called Inverse Distance Estimation brevity, can also applied to other variables. Advantages gained utilization definite discussed regard how radius, fractional lobe filling, mass ratio information expressed observations. advantages were tested solutions noisy synthetic data. Also simulations ideas on optimal number solved under various conditions. dim companion has been observed or literature but most find its well below giant. Solutions masses too low evolution stage within age Galaxy, result probably an artifact brightness fluctuations.