Analysis of the U-band orbital variation of the symbiotic binary AG Draconis during quiescence

Details Analysis of the U-band orbital variation of the symbiotic binary AG Draconis during quiescence Analysis of the U-band orbital variation of the symbiotic binary AG Draconis during quiescence

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...364..557t&link_type=abstract

Astronomy and Astrophysics, v.364, p.557-562 (2000)

Astronomy and Astrophysics

Astrophysics

6

Stars: Binaries: Symbiotic, Stars: Individual: Ag Dra, Stars: Mass-Loss, Stars: Circumstellar Matter, Stars: Distances, Stars: Fundamental Parameters

Scientific paper

The photometric U orbital variations of the symbiotic binary AG Dra, caused by occultation of a bright gaseous region by the K giant in this system, are used to derive the emission from the circumbinary nebula, that is supposed to be generated by the cool giant's wind. Assuming spherical symmetry and constant expansion velocity for the wind, and that the giant has the same intrinsic continuum energy distribution of α Boo, we derive a cool giant's radius of 28/32 Rsun and a distance of 1560/1810 pc. We conclude that the cool giant does not fill its Roche lobe, which is contrasting with the intense, accretion powered X-ray emission.

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