Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jdso....2...51d&link_type=abstract
Journal of Double Star Observations, vol. 2, no. 2, p. 51-53.
Astronomy and Astrophysics
Astrophysics
Scientific paper
Polaris (STF 93) is a bright Cepheid variable, thus most interesting to the astrophysicist. One, for instance, may ask if the birth of these milepost stars typically involve the formation of additional physical components. Close study of Polaris and its 5 attendants, one spectroscopic, perhaps one interferometric and three visual, may help in the understanding of these special objects' evolution. In addition to Sir William Herschel's early discovery of the B component, Burnham, in 1884, discovered C and D, both much fainter companions of Polaris. The last observation and measurement of "C" was by Burnham in 1890 and "D" was recently (1999) identified in 2 MASS images. Described here is the technique used to recover C and solidly image both C and D in the presence of the bright primary. These images were measured (results reported elsewhere) to obtain accurate positions angles and separations of the B, C and D components. Preliminary color measurements of C and D were performed and is reported here. This work is in response to a challenge by Dr. Brian Mason of the USNO to the double star group to recover and measure the positions of these two faint components. The observing period was March 13 through April 16, 2005.
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