Period Variables in Sagittarius
Observatory, Nantucket, Massachusetts
variables in VSF 193 in Sagittarius were studied during the suumer of 1972,
three of which were of Mira type.
(18h 22m 55s, -22¡ 50.9', 1900) was discovered to have varying amplitude,
ranging from magnitude 13.3 to 13.7 for its low and high maxima, to magnitude
15 at minima, with a period of 249 days.
star, B29* ( 18h 27m 17s, -20¡ 10.4', 1900) was discovered by Pamela Bonnell in
1971 on the Nantucket plates. The star varies from magnitude 11.6 to below
14.2. It appears to have a changing period. From about JD 18,000 to 33,000 a
period of 345 days fits the data. From about 35,000 to the present the period
appears to be 358 days. Whether this change is a single event or is part of a
systematically varying period remains to be determined.
The third star
B30* (18h 24m 35s, -28¡ 07.0', 1900) also has a changing period. d