The reddening and variability of XX Ophiuchi

Details The reddening and variability of XX Ophiuchi The reddening and variability of XX Ophiuchi

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..161e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 161-167.

Astronomy and Astrophysics

Astrophysics

7

Binary Stars, Interstellar Extinction, Ophiuchi Clouds, Stellar Spectra, Symbiotic Stars, Emission Spectra, Variable Stars

Scientific paper

We present polarization data on the XX Oph system which suggest that the interstellar extinction to this object has been overestimated in the past: our data imply A(V) = 1.6 mag. Our photometry and infrared spectroscopy suggest a spectral class of M7III for the late component, and a BOV companion that ionizes the wind of the cool component. XX Oph seems more like a Zeta Aur/VV Cep system than a 'symbiotic object'. The photometric variability of XX Oph seems to have a number of causes, ranging from shell-type variability in the U band to variations in the M component in the infrared.

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