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HD 185121


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Synchronization in late-type binary stars
The synchronism between rotation and revolution in late-type closebinaries is rediscussed by an inspection of the published rotationvelocities and rotation (photometric) periods of about 50 binarycomponents. Basically, it is found that, as a rule, dwarfs havingfractional radii of more than 0.05 appear to be in synchronous rotationand those with radii of less than 0.03 are in asynchronous rotation;asynchronism is more frequently observed in giants. Remarkably, theobserved degree of synchronism appears to be in substantial agreementwith current theoretical views (Zahn, 1977) on tidal friction inlate-type binaries.

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Observation and Astrometry data

Constellation:Αετός
Right ascension:19h37m25.00s
Declination:+05°27'17.0"
Apparent magnitude:8.626
Distance:487.805 parsecs
Proper motion RA:-1.3
Proper motion Dec:-4.8
B-T magnitude:8.709
V-T magnitude:8.633

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 185121
TYCHO-2 2000TYC 486-3035-1
USNO-A2.0USNO-A2 0900-15898226
HIPHIP 96525

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