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Speckle‐interferometry and provisional orbit of BU 738
Author(s) -
Scardia M.,
Neri R.,
Grewing M.
Publication year - 1991
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.2113120605
Subject(s) - physics , speckle pattern , orbit (dynamics) , telescope , orbit determination , observatory , speckle imaging , elliptic orbit , interferometry , binary number , astrophysics , astronomy , geodesy , optics , mathematics , satellite , geology , aerospace engineering , arithmetic , engineering
Three different orbits of BU 738 ‐ WDS 02189 S 3019, a close visual binary, have been proposed up to now: Finsen (1969, elliptic orbit), Finsen (1969, parabolic orbit) and Heintz (1984, elliptic). In the last few years, three micrometric observations [MS] and a single speckle‐interferometric observation [RN and MG] have been independently carried out with the ESO/GPO 38 cm astrograph and ESO/MPI 2.2 m telescope. From these measurements and a list of observations of C. E. Worley of the Naval Observatory a new provisional orbit is proposed. Whereas new observations will improve the presented solution, the validity of the first two orbits suggested by Finsen has definitively to be ruled out. The masses of the two components are estimated as M A = 1·09 M Ȯ and M B = 1·01 M Ȯ, respectively.