COMMISSION 27 OF THE I. A. U.
INFORMATION BULLETIN ON VARIABLE STARS
Number 1740
Konkoly Observatory
Budapest
1980 February 11
THE ELEMENTS OF THE ECLIPSING BINARY HU TAURI
During the period from November, 1974 to January, 1976 the eclipsing binary HU
Tau was observed photoelectrically with the 50 cm Cassegrain telescope of
Bucharest Observatory. The observations were performed in two colours, V and
B. BD+19d744 was used as comparison star.
The light curves were made up of 122 normal points in V and 114 in B. The
heliocentric timing minima for computation of the phase angle were chosen
2442807.2718 J.D. and 2442807.2693 J.D. for the light curves in V and B,
respectively.
The rectification was carried out by the Russell-Merrill method. The
coefficients of rectification are presented below.
Filter V Filter B
A_0= 0.9732+-0.0021 A_0= 0.9800+-0.0018
A_1=-0.0198+-0.0032 A_1=-0.0032+-0.0028
A_2=-0.0280+-0.0031 A_2=-0.0079+-0.0028
B_1= 0.0011+-0.0022 B_1= 0.0024+-0.0019
B_2= 0.0009+-0.0023 B_2= 0.0023+-0.0020
C_0= 0.0172 C_0= 0.0026
C_1= 0.0198 C_1= 0.0032
C_2= 0.0056 C_2= 0.0010
There were no special problems in the computation of the geometric and
photometric elements. The elements are given as follows:
Filter V
k=0.8104, r_g=0.2150, i=78.5deg, L_s=0.8020, L_g=0.1880, x_g=0.8, x_s=0.0,
alpha_O^OC=0.5976, Theta_e= 26.4deg, J_s/J_g=6.50
Filter B
k=0.7910, r_g=0.2127, i=78.3deg, L_s=0.8310, L_g=0.1690, x_g=0.8, x_s=0.0,
alpha_O^OC=0.6150, Theta_e= 26.6deg, J_s/J_g=7.88.
So far no elements have been published. A detailed analysis of this system
will be published elsewhere.
AL. DUMITRESCU
Center of Astronomy and Space Sciences
Bucharest, Rumania
R. DINESCU
Institute of Geodesy, Photogrammetry,
Chartography and Land Management
Bucharest, Rumania
References:
1. Strohmeier, W., Knigge, R., 1960, Veroff. Bamberg, Bd. V, 5
2. Strohmeier, W., 1963, Sky and Tel., 26, 264 [BIBCODE 1963S&T....26..264S ]
3. Mammano, A., Mannino, G., and Margoni, R., 1967, Mem. Soc. Astr. It. 38,
fasc. 3
4. Tumer, O. and Kurutac, M., 1979, I.B.V.S. No. 1547