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Nineteen new spectroscopic binaries and the rate of binary stars among F-M supergiants
Nineteen spectroscopic binaries (SBs) have been discovered in radialvelocity measurements made with the CORAVEL spectrophotometer on 181northern F-M supergiants. The rate of detected SBs among northern F-Msupergiants is 21 percent, without any dependence on spectral orluminosity class. The study of the binary F-M supergiants with knownorbital elements indicates that all the systems with a period smallerthan the critical value P(circ) have a nearly circular orbit. The valueof P(circ) depends on the luminosity class, being 400-600 d for class Iband 2000-7000 d for class Ia. This circularization of the orbits may bedue to the transfer of angular momentum during the phase of binary massexchange.
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Osservazione e dati astrometrici
| Costellazione: | Ofiuco |
| Ascensione retta: | 17h56m13.59s |
| Declinazione: | +07°30'35.6" |
| Magnitudine apparente: | 10.321 |
| Moto proprio RA: | 14.7 |
| Moto proprio Dec: | 10.8 |
| B-T magnitude: | 10.859 |
| V-T magnitude: | 10.366 |
Cataloghi e designazioni:
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