# Physical parameters of the visually close binary systems hip70973 and hip72479

The method at first used earlier versions of lineblanketed plane-parallel theoretical model atmospheres for F, G, and K-type stars [14], where it counted physical parameters of the visually close binary systems hip70973 and hip72479 for the hydrogen lines opacities in building the SEDs [3]. The preliminary calculated set is taken as starting values and an iteration method for the different sets of elements is used. Depending on the estimated physical and geometrical elements of the system, which are assured by synthetic photometry, we suggest that the two components are evolved subgiant F8. The estimated parallax obtained by the second approach does not coincide with orbital elements and mass sum calculated hereafter in this work see Table Vwhile that given by Hipparcos was acceptable somehow.

A modified orbit and geometrical elements of the system were calculated and compared with earlier ones. Positional Fourth Interferometric Epoch The estimated parallax obtained by the second approach does not coincide with orbital elements and mass sum calculated hereafter in this work see Table Vwhile that given by Hipparcos was acceptable somehow. Where [13] concludes that fragmentation of a rotating disk around an incipient central protostar is possible, as long as there is continuing infall. Relative visual orbit of the system HD; The origin represents the position of the primary component.

The absolute calibrator was. Doubts in Hipparcos parallax measurements were introduced by [41]. The terms on the right hand side represent linear d. Based on the similarity of both components, fragmen- 3.

The least-square fitting with weights inversely proportional to the squares of the positional measurements observational errors is used to modify the orbit of the system. That leads us to suggest that both components are evolved subgiant stars with age around 3. Is the central binary system of the planetary nebula Henize a Oct 25, - We critically discuss the recent observations of the binary system at the center of the bipolar planetary nebula Henize The absolute calibrator was. The first approach resulted in the following radii:

Hence a spectral energy distribution for each component are built. Is the central binary system of the planetary nebula Henize a Oct 25, - We critically discuss the recent observations of the binary system at the center of the bipolar planetary nebula Henize The authors express the sincere thanks to Dr. The preliminary calculated set is taken as starting values and an iteration method for the different sets of elements is used. The first approach resulted in the following radii:

The estimated parallax obtained by the second approach does not coincide with orbital elements and mass sum calculated hereafter in this work see Table Vwhile that given by Hipparcos was acceptable somehow. This consistency gives a good indication about the reliability of the estimated elements of the individual components of the system, which are listed in Table VI. Home The visually close binary system HD; Is it a sub-giant binary? Where [13] concludes that fragmentation of a rotating disk around an incipient central protostar is possible, as long as there is continuing infall.

One can write [4]: The left hand side of equation 6 describes an uncoupled oscillator. Physical and geometrical elements of the components of the system. Therefore, one has to be careful when using these measurements. Magnitude difference between the components of the system along with filters used to obtain the observations.