COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 899 Konkoly Observatory Budapest 1974 June 19 PHOTOELECTRIC OBSERVATIONS OF 44 TAU Three-colour photoelectric observations of the star 44 Tau (delta Scuti type) were accomplished during November - December 1973 on the 40 cm telescope of the Byurakan observatory. Because of rather poor weather conditions we could not effectuate more than six observational series. 42 Tau was taken as comparison star. The results of our observations are presented in the Table. The Delta_v, Delta_b, and Delta_u values (var.-comp.) are the corresponding differences (44-42) of the instrumental v,b,u magnitudes of 44 Tau and 42 Tau. The system of ubv magnitudes is close to the international UBV system. The mean error of the presented data is of the order of +/- 0.005m - +/- 0.007m. In Figure 1 the Delta_b values are plotted against JD hel. The obtained curves seem to indicate the existence of a period of about three hours (Desikachary, Astr. Astroph. 27, No. 3., 1973). A more detailed analysis of the light variation of this star has not been made because of the relatively small number of data. Further observations of the star 44 Tau are planned. A. TERZAN V. OSKANIAN Lyon Observatory Byurakan Observatory France Armenian SSR, USSR. Date JD hel Deltav Deltab Deltau Date JD hel Deltav Deltab Deltau 1973 24420.. + + + 1973 24420.. + + + XI-17 04.35352 .15 .12 .30 XI-20 07.43624 .21 .21 .35 .36533 .17 .15 .37 .44318 .22 .23 .38 .37019 .17 .16 .30 .44596 .23 .23 .37 .38130 .18 .19 .33 .45291 .22 .24 .37 .38685 .20 .19 .37 .45568 .23 .24 .38 .39797 .22 .23 .41 .46263 .22 .23 .36 .40283 .22 .22 .43 .46541 .21 .21 .35 .41394 .26 .27 .43 .47235 .20 .20 .35 .41949 .22 .23 .39 .47513 .20 .20 .32 .43199 .22 .22 .39 .48277 .19 .18 .32 .43755 .19 .19 .32 .48485 .19 .17 .32 .44866 .17 .17 .34 .49180 .17 .17 .32 .45422 .16 .14 .28 .49457 .17 .15 .30 .46602 .15 .13 .28 .50152 .16 .14 .30 .47227 .16 .12 .29 XI-26 13.23703 .17 .18 .37 .48338 .17 .14 .31 .24398 .17 .18 .34 .48894 .16 .13 .28 .24606 .22 .22 .37 .50074 .17 .15 .28 .25231 .20 .21 .38 XI-20 07.24735 .19 .21 .41 .25509 .21 .21 .40 .25638 .18 .18 .33 .26203 .20 .21 .38 .25916 .19 .20 .33 .26412 .20 .22 .37 .26610 .19 .19 .35 .27106 .21 .23 .38 .28416 .19 .20 .35 .27384 .21 .21 .38 .29110 .19 .19 .34 .28009 .22 .22 .38 .20318 .22 .20 .43 .28217 .23 .23 .39 .30013 .20 .20 .36 .28912 .23 .22 .37 .30291 .20 .21 .37 .29120 .21 .22 .39 .31055 .20 .21 .37 .29884 .21 .22 .37 .31332 .20 .20 .36 .30092 .19 .20 .36 .32027 .21 .21 .36 .30787 .19 .19 .55 .32305 .21 .21 .38 .31065 .21 .20 .36 .32930 .20 .20 .36 .31899 .20 .18 .33 .33138 .20 .21 .36 .32176 .15 .17 .31 .33832 .21 .21 .36 .32870 .15 .15 .31 .34041 .21 .19 .36 .33217 .17 .15 .32 .34666 .20 .19 .35 .33912 .16 .15 .31 .34874 .21 .20 .35 .34259 .14 .14 .29 .35568 .21 .19 .35 .35231 .16 .14 .29 .35777 .18 .17 .32 .35578 .15 .14 .31 .36402 .17 .16 .32 .36412 .15 .15 .29 .76680 .18 .16 .31 .36690 .15 .17 .31 .37374 .16 .15 .30 .37384 .16 .17 .32 .77582 .17 .15 .31 .37731 .21 .20 .38 .38346 .16 .14 .31 .38426 .21 .20 .38 .38624 .16 .14 .30 .38703 .20 .20 .37 .39318 .17 .14 .30 .39398 .22 .22 .37 .39666 .16 .14 .30 .39745 .22 .23 .37 .40430 .16 .15 .30 .40509 .23 .24 .37 .40638 .18 .16 .31 .40856 .22 .23 .37 .41541 .19 .18 .32 .41690 .25 .26 .40 .41818 .20 .*9 .35 .42017 .22 .24 .38 .42443 .20 .20 .35 .42802 .24 .24 .38 .42652 .22 .20 .37 .43078 .23 .23 .38 .43346 .22 .22 .39 .43773 .20 .23 .36 XI-26 13.44120 .21 .19 .34 XI-27 14.45856 .22 .21 .36 .44884 .19 .17 .33 .46551 .20 .20 .36 .45231 .18 .16 .27 .46759 .19 .18 .33 .45926 .16 .13 .27 .47592 .18 .17 .33 .46203 .16 .14 .28 XI-28 15.23773 .17 .20 .32 .46828 .15 .13 .30 .24467 .20 .19 .33 .47037 .14 .11 .26 .24676 .18 .16 .34 .47731 .14 .13 .27 .25370 .21 .21 .34 .48009 .15 .12 .28 .25578 .22 .23 .37 .48773 .17 .15 .30 .26273 .20 .21 .34 .49120 .16 .15 .30 .26551 .19 .21 .35 .49815 .18 .17 .34 .27245 .22 .23 .37 XI-27 14.25648 .18 .24 .41 .27523 .21 .23 .37 .26412 .18 .24 .43 .28148 .20 .22 .37 .26620 .18 .20 .39 .28426 .22 .22 .37 .27315 .20 .21 .39 .29120 .23 .22 .37 .27662 .21 .23 .38 .29606 .24 .25 .39 .28356 .21 .21 .35 .30231 .23 .25 .37 .28634 .20 .22 .38 .30509 .21 .23 .34 .29328 .18 .20 .36 .31273 .19 .21 .37 .29606 .19 .20 .33 .31481 .19 .20 .37 .30301 .18 .18 .32 .32106 .20 .21 .37 .30578 .20 .18 .30 .32384 .21 .21 .36 .31203 .16 .14 .29 .33148 .20 .19 .32 .31481 .15 .16 .31 .33356 .17 .17 .32 .32176 .15 .15 .29 .33912 .16 .16 .32 .32384 .16 .15 .31 .34259 .19 .17 .41 .33078 .18 .16 .30 .34815 .15 .14 .29 .33356 .16 .16 .32 .35023 .16 .16 .29 .34051 .17 .17 .31 .35717 .15 .13 .27 .34259 .18 .16 .31 .35926 .17 .14 .30 .34953 .19 .17 .31 .36481 .16 .14 .31 .35162 .19 .17 .31 .36690 .17 .15 .32 .35995 .19 .18 .33 .37245 .16 .15 .30 .36203 .19 .19 .31 .37453 .18 .16 .31 .36898 .18 .18 .33 .38078 .18 .16 .32 .37176 .18 .18 .33 .38287 .18 .17 .32 .37870 .19 .20 .35 .38842 .19 .19 .34 .38078 .17 .17 .31 .39051 .18 .18 .37 .38773 .20 .21 .34 .39606 .19 .19 .34 .39051 .18 .18 .35 .39884 .20 .20 .35 .39745 .19 .19 .35 .40509 .20 .20 .30 .40023 .23 .21 .35 .40717 .20 .20 .34 .40717 .21 .21 .34 .41342 .20 .21 .35 .40995 .21 .20 .36 .41551 .19 .21 .35 .41690 .21 .19 .36 .42176 .20 .22 .35 .41967 .23 .22 .38 .42384 .20 .21 .37 .42731 .22 .22 .37 .43009 .21 .22 .39 .42940 .22 .21 .36 .43217 .21 .20 .35 .43634 .23 .33 .37 .43842 .33 .22 .37 .43912 .21 .21 .36 .44120 .22 .21 .36 .44606 .22 .22 .39 .44745 .19 .19 .36 .44884 .22 .22 .37 .45023 .18 .15 .34 .45578 .22 .22 .38 .45717 .19 .19 .38 XI-28 15.45926 .19 .19 .34 XII-21 38.31453 .20 .20 .46828 .19 .20 .36 .32286 .20 .21 XII-2138.25203 .15 .14 .32633 .21 .22 .26314 .14 .12 .33675 .24 .25 .26592 .14 .13 .34092 .21 .21 .27425 .15 .15 .35064 .21 .22 .27703 .15 .13 .35480 .20 .21 .28744 .20 .19 .36381 .19 .19 .29161 .16 .16 .36730 .19 .18 .29994 .20 .21 .37980 .20 .20 .30272 .18 .18 .38467 .18 .18 .31105 .21 .22 [FIGURE 1]