R Aquarii - H-alpha map of subarcsecond inner structure

Details R Aquarii - H-alpha map of subarcsecond inner structure R Aquarii - H-alpha map of subarcsecond inner structure

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..543h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. 543-550.

Other

9

Shell Stars, Stellar Interiors, Stellar Structure, Astronomical Maps, H Alpha Line, Speckle Interferometry, Stellar Envelopes

Scientific paper

A 45-mas-resolution image of R Aqr, observed near minimum brightness with speckle interferometry in a 1.8-nm optical bandpass centered on H-alpha, was obtained. The H-alpha C1-C3 separation is consistent with the separation between the close proximity astrometric positions of the LPV and SiO maser sources and the absolute position of the C1 radio component seen in high resolution with the VLA. Moreover, the C1-C3 axis is remarkably well aligned with the symmetric inner jet seen in forbidden line O III at 5007 A. While the nature of C3 is not known at present, it may arise in the LPV envelope or could simply be another knot of emission in the inner jet. If C3 is in fact associated with the LPV at 180 pc, it would be the first spatial resolution of the stellar components of the system as the C1-C3 distance is about 3.3 x 10 exp 14 cm and on the order of the binary separation previously suspended for the system.

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