Two Stars in Sagittarius with Changing Periods

Details Two Stars in Sagittarius with Changing Periods Two Stars in Sagittarius with Changing Periods

Jun 1972

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972javso...1...56k&link_type=abstract

The Journal of the American Association of Variable Star Observers, vol. 1, no. 2, p. 56-59

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Variables, Mira

Scientific paper

My work at The Maria Mitchell Observatory during the summer of 1972 was done on stars in VSF 193 in Sagittarius. In this paper I would like to discuss two stars which were found to have changing periods - one a long period Mira type and the other a short period RR Lyrae type. The first of these stars temporarily designtated as B15, (RA 18h 20m 52s, Dec. -28° 27:8, 1900, mag. range 12.6-14.5pg), was discovered at Nantucket during the summer of 1971 by Karen Kwitter. I re-estimated it on approximately 500 NA plates and about 200 MF and B plates by comparing its brightness on each plate to standard comparison stars. Next the magnitude estimates were plotted against Julian day on a scale of 100 days to the inch, and some pieces of light curves began to be visible.

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