Abstract
view Abstract Citations (27) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Binary System X Ophiuchi. Fernie, J. D. Abstract A study of all available observations of the X Oph visual binary system (K1 III t M6e) is described. It is concluded that the mass of the long-period variable component is close to , compared to the mass of about predicted by the mass-luminosity relation. This smaller mass leads to a pulsation constant, P Vp similar to that observed for other types of variables and in close agreement with theory. The age of X Oph is about 5 X 10 years, and hence probably all long-period variables are old. Evidence is given to support the suggestion that long-period variables evolve from early F dwarfs. It is shown that the binary nature of X Oph has not in any way affected its evolution and that it is not necessary, therefore, for a star to belong to a binary system in order to become a long-period variable. Publication: The Astrophysical Journal Pub Date: September 1959 DOI: 10.1086/146750 Bibcode: 1959ApJ...130..611F full text sources ADS | data products SIMBAD (20) GCPD (1) Related Materials (1) Reprint: 1959PGLO...35...31F
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