A Search for Period Changes by the Variables in M13

Details A Search for Period Changes by the Variables in M13 A Search for Period Changes by the Variables in M13

Feb 1969

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969aj.....74..108o&link_type=abstract

Astronomical Journal, volume 74, page 108 (1969).

Astronomy and Astrophysics

Astronomy

9

Scientific paper

The total available observational material for the four well-observed
variable stars in M13 has been considered together. Improved periods
have been obtained and it has been shown that Variable 2 has undergone a
lengthening of its period since 1900. Forty-one recent observations of
these stars are also presented.

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