COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1349

                                    Konkoly Observatory
                                    Budapest
                                    1977 October 11



  CHARTS AND UPDATED RESULTS FOR TWELVE SAGITTARIUS VARIABLES




    Finder charts (Figures 1 and 2) and updated results are
given (Table I) for twelve long-period variables in Sagittarius.
Their elements as given in the GCVS had been determined prior         
to 1959 from observations on Harvard plates taken mainly between
1924 and 1950. The Nantucket plates taken from 1957 to 1977 were
searched for maxima and the periods have been revised accordingly. 
In all cases the previous periods were either confirmed or
only slightly altered. In general, both the old and the new 
observations are satisfied by the new period. Three of the stars,
however, appear to have changing periods: V1658, V1667 and
V1691 Sgr. Although the changes for the first two of these are
small, better representations of the maxima are found when the
early and the late observations are treated separately. Fig. 3
indicates a fair representation by a single constant period for
all of the observations of V1658 Sgr, but the scatter is improved 
if the period is assumed to have changed at about JD 28000.
V1667 Sgr is a similar case. Both of these stars should probably
be classified as SR. The three day decrease in period of V1691 Sgr
is unmistakable; the period for neither group of observations
will adequately satisfy the other group.
    This investigation was carried out under a grant from the
U.S. National Science Foundation, AST77-06974.




                                 DORRIT HOFFLEIT
                                 Maria Mitchell Observatory
                                 Nantucket, Mass. 02554,
                                 U.S.A.


        [FIGURE 1]

Figure 1. Finder charts for the
first six variables in Table I.
South is at top, area of field 
approximately 10' x 10'        
                                               [FIGURE 2]                                 
                                    Figure 2. The last six variables
                                    in Table I.

                                          7. V1689 Sgr G is Co.D.-22d13095
1. V1651 Sgr A is Co.D.-23d14286          8. V1691 Sgr H is Co.D.-22d13101
2. V1658 Sgr B is Co.D.-23d14319          9. V1695 Sgr I is Co.D.-22d13119
3. V1663 Sgr C is Co.D.-25d13149         10. V1696 Sgr J is Co.D.-25d13271
4. V1665 Sgr D is B.D. -21d5017          11. V1697 Sgr K is Co.D.-22d13135
5. V1667 Sgr E is Co.D.-24d14385         12. V1901 Sgr L is Co.D.-26d13247
6. V1668 Sgr F is Co.D.-22d13014

                   Table I

         Revised Data for Sagittarius Variables

 Name  GCVS    Per     Revised  Per  Chart Note
 Sgr   JD0             JD0
1651   24440   398d    40400   400d    1   a
1658   26560   105     36410   106     2   b
1663   26570   148     43000   148:    3   SR
1665   26170   297     42275   298     4
1667   26560   158     43010   159     5   c
1668   27230   285     41530   286     6
1689   23590   149.5   42275   149.5   7   SR
1691   26520   235     39300   232     8   d
1695   24380   191     40090   191.5   9   SR
1696   26230   292     42585   292    10
1697   26120   260     43010   260    11
1901   26160   142.6   42278   142.6  12    e

a. The new period satisfies both the older Harvard and the recent
Nantucket observations.


b. The early period holds through JD 28000; thereafter 106d   is
better. See Fig.3.
c. Period seems to be changing. 158d holds to JD 36000, 159d
thereafter.
d. Period seems to have changed sometime between JD 28000 and
36000. The Harvard observations were mainly for JD 23900 to
28000; the Nantucket from JD 36000 to 43000.
e. Estimates for this star on Nantucket plates were carried out
by a student, Gail Harns.

                         [FIGURE 3]

Figure 3. O - C plot of maxima for V1658 Sgr based on period of
106 days. Horizontal markers at intervals of 10,000 days, vertical
intervals of 50 days. The observations near JD 18000 are plotted
as computed and displaced by one cycle, thus indicating the
early period of 105 days. Dots indicate single observations,
vertical bars the span or duration of maxima.