- freely available
Data 2018, 3(4), 39; https://doi.org/10.3390/data3040039
2. Binary and Multiple Star Objects Identification Scheme BSDB
3. Identification List of Binaries
4. Observational Types
- Visual binary (Vis)—a binary star system in which both components are visible and resolvable in a telescope.
- Orbital binaries (Orb) are visual binaries, demonstrating sufficiently remarkable orbital motion to calculate orbital parameters.
- Common proper motion (CPM) binaries are pairs of stars separated by a few arcseconds or arcminutes and having the same proper motions. The members of each pair presumably formed in close association, are expected to be coeval and to have the same chemical composition.
- Astrometric binaries (Ast), or stars with invisible companions, can be deduced from periodic variations in the star’s position, if the position is determined relative to other stars. The alterations in position, which are superimposed on the proper motion of the star, are caused by its revolution with the invisible companion about their common centre.
- Interferometric binaries (Int) present cases where the components are so close that it can not be observed directly as a visual binary, but can be resolved using various interferometric techniques.
- Occultation binaries (Occ) are discovered by photoelectric analysis of lunar (or asteroid) occultation of very close pairs.
- In spectroscopic binaries (SB) the variation of the radial velocities during a revolution of a binary star can be observed spectroscopically: the lines in the overlapping spectra of the two components show periodic doubling or displacement (so called SB2 and SB1, respectively).
- Eclipsing binaries (EB) are binary stars of which one at times eclipses the other, thus leading to alterations in the apparent total brightness of the combined stars.
- X-ray binaries (XRB) are pairs of stars producing X-rays, as the stars are close enough together that material is pulled off the normal star by the mass of the dense star.
- Radiopulsars in binary systems (Rad) show periodic variations in the pulsation period caused by orbital motion.
- Recently detected gravitational-wave signals produced by the coalescence of two stellar-mass black holes led to appearance of a new observational type of binaries, gravitational-wave binaries (GW).
- Cataclysmic variables (CV)—see below.
4.1. Cataclysmic Variables
4.2. Other Observational Types of Binaries
- chromospherically active binaries,
- composite spectrum (including symbiotic) binaries,
- spotted variables (binaries),
- ellipsoidal variables (binaries),
- reflecting variables (binaries).
5. Connection with External Databases
Conflicts of Interest
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