Orbit and estimations of masses of components of ADS 14636 (61 Cygni) on the basis of photographic observations at Pulkovo Observatory

Details Orbit and estimations of masses of components of ADS 14636 (61 Cygni) on the basis of photographic observations at Pulkovo Observatory Orbit and estimations of masses of components of ADS 14636 (61 Cygni) on the basis of photographic observations at Pulkovo Observatory

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240q.126g&link_type=abstract

Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he

Astronomy and Astrophysics

Astrophysics

Scientific paper

The investigation of the wide double star 61 Cyg fulfilled by means of long-term series (40 years) of photographic observations of 26" refractor of Pulkovo observatory. The purposes of the investigation are 1) determination of the pair's orbit and masses of its components and 2) detection of possible invisible satellites. The two more long-term series of wide double stars - ADS 7251 (38 yr.) and ADS 14710 (23 yr.) were used for control. Obtained photo-plates were measured by means of automatic measurement machine "Fantazia" in Pulkovo observatory. Relative positions (distances between components and positional angles) were calculated for all pairs. The relative orbit of 61 Cyg was constructed and total mass of the pair was calculated by means of the Apparent Motion Parameters Method developed in Pulkovo observatory. These series were investigated by means of Scargle's and CLEAN methods to detect periodic deviations in orbital motion. Far star ADS 14710 (pi=0.0016) was used as control star. Two peaks were detected in periodogram of X projection of components relative motion of 61 Cyg only. They correspond to periods of 6.4 and 11.2 years. The investigation of separate motion of each component of 61 Cyg relative to surrounded stars fulfilled. The mass ratios and hence individual masses of its components calculated. They are 0.74 ± 0.13 and 0.46 ± 0.07 of solar masses for primary and secondary components respectively. There is a small peak on periodogram of X projection of separate motion of 61 Cyg A. It corresponds to period of 6.2 years. We suppose that invisible satellites may be in 61 Cyg's system, but their mass does not exceed 0.01 solar mass.

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