Orbital and Physical Parameters of Visual Binary: WDS 171903459 ({\alpha} 2000 = 17h 18m 56s and {\delta} 2000 =  34o 59' 22")
Abstract
Since the Bosscha Observatory was established in 1923 researches on visual binary stars played an important role in astronomical studies in Indonesia. The visual binary of WDS 171903459 = MLO 4AB = HD156384 = HIP84709 was extensively observed at our observatory and other observatories. This system has already passed periastron three times since observed in the end of year 1876. The observation data is more than enough to construct an orbit. By using ThieleInnes method we computed the orbit, and physical parameters are determined by using massluminosity relation. The result is presented in the table. Orbital Parameters: e = 0.578, P = 42.3 years, T = 1974.9, i = 132 o.7,{\omega} = 247o.5, {\Omega} = 318o.1, a = 1".713, mu = 8 o.51/years Physical Parameters:p = 0".134, Mbol1 = 6.7, Mbol2 = 7.4, M1 = 0.6 Mo, M2 = 0.5 Mo, q = 0.863. At time being there are several new methods for determining the orbit; for example the method of Gauss done by Söderhjelm (1999) for calculating the orbit of the same stars WDS 171903459. Our results are relatively same.
 Publication:

arXiv eprints
 Pub Date:
 July 2010
 arXiv:
 arXiv:1007.3330
 Bibcode:
 2010arXiv1007.3330N
 Keywords:

 Astrophysics  Solar and Stellar Astrophysics;
 Astrophysics  Instrumentation and Methods for Astrophysics
 EPrint:
 4 pages, 3 figures