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HD 179286


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A study of visual double stars with early type primaries. IV Astrophysical data
Astrophysical parameters (MK class, color excess, absolute magnitude,distance, effective temperature, mass, and age) are derived fromcalibrations of the uvby-beta indices for the members of 253 doublestars with O or B type primaries and faint secondaries. The photometricspectral classification is compared to the MK classes, and the agreementis very good. The derived data together with spectroscopic and JHKL dataare used for deciding which pairs are likely to be physical and whichare optical, and it is shown that 98 (34 percent) of the secondaries arelikely to be members of physical systems. For 90 percent of the physicalpairs the projected separation between the components is less than25,000 AU. A majority of the physical secondaries are late-type stars,and 50 percent of them are contracting towards the zero-agemain-sequence. Also presented are new uvby-beta data for 43 secondariesand a computer program for determining astrophysical parameters fromuvby-beta data.

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Observation and Astrometry data

Constellation:Aquila
Right ascension:19h12m01.57s
Declination:+00°54'36.1"
Apparent magnitude:10.224
Proper motion RA:32.5
Proper motion Dec:-28.5
B-T magnitude:10.869
V-T magnitude:10.278

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 179286
TYCHO-2 2000TYC 463-2880-1
USNO-A2.0USNO-A2 0900-14153345

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