The Astrophysical journal . would be expectedfrom the degree of consistency of the individual probable errors computed from the latter follow the others,and are regarded as more reliable. In the determination of corrections by means of first differ-ential coefficients, numerical checks should be applied for thepurpose of testing the accuracy with which the differential rela-tions hold when the finite corrections are substituted for the dif-ferentials. In the present case this is done by computing the velocities in the line of sight (7^). from both elements I and II, for the ti
The Astrophysical journal . would be expectedfrom the degree of consistency of the individual probable errors computed from the latter follow the others,and are regarded as more reliable. In the determination of corrections by means of first differ-ential coefficients, numerical checks should be applied for thepurpose of testing the accuracy with which the differential rela-tions hold when the finite corrections are substituted for the dif-ferentials. In the present case this is done by computing the velocities in the line of sight (7^). from both elements I and II, for the times corresponding to the normal places; then thevalues of should agree within reasonable limits with those of obtained from the observation equations by omitting the first and 66 IV. H. WRIGHT last terms. These quantities are tabulated in columns 6 and 7of Table II. The discrepancy in the case of (8) arises from therapid variation of the coefficient b with the time : but it is notlarge enough sensibly to affect the Min Fig. 3. The following are the final elements ELEMENTS II. V^— ± km velocity of system in line of = ± (0 = ° ± 1-95° r= ^ ± a: , —=. sin /.1 P ORBIT OF 1) AQUILAE 67 As being of possible interest in connection with the matterof the stars light variation, the light curve due to Schur is givenin the lower part of Fig. 2. A diagram of the orbit is alsoappended. The positions of the star at princijjal maximum andminimum are indicated by Max. and Min., those at the secondaryphases by and Min.,. /^indicates the position of peri-astron. I wish to acknowledge the advice and assistance of ProfessorCampbell, given during the progress of this research. TABLE I. Obs. No. Plate No. Date Days afterLight Max. Vel. Wt. o-c Elem. I I 781 B June — % — — 1-3 2 789 c — % — — 3 791 B — I — — 4 795 D July
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspectru, bookyear1895
