Friday, June 30, 2017


Events have conspired to steal my "blog time" this week. My family is in town--kids and grandkids demand attention, as they should!--and I'm doing some polishing on Book 4 of the Interstellar Rescue series before I send it off to my agent/publisher.

So enjoy this image of a binary star ballet courtesy of NASA, and the U.S. space agency's excellent explanation of what's happening below.

Symbiotic R Aquarii
Image Credit: X-ray - NASA,CXC,SAO, R. Montez et al.; Optical - Adam Block, Mt. Lemmon SkyCenter, U. Arizona
Explanation: A long recognized naked-eye variable star, R Aquarii is actually an interacting binary star system, two stars that seem to have a close, symbiotic relationship. About 710 light years away, it consists of a cool red giant star and hot, dense white dwarf star in mutual orbit around their common center of mass. The binary system's visible light is dominated by the red giant, itself a Mira-type long period variable star. But material in cool giant star's extended envelope is pulled by gravity onto the surface of the smaller, denser white dwarf, eventually triggering a thermonuclear explosion and blasting material into space. Optical image data (red) shows the still expanding ring of debris originating from a blast that would have been seen in the early 1770s. The evolution of less understood energetic events producing high energy emission in the R Aquarii system has been monitored since 2000 using Chandra X-ray Observatory data (blue). The composite field of view is less that a light-year across at the estimated distance of R Aquarii.

Next week I'll be reporting from the 39th Annual Shore Leave SF Convention in Hunt Valley MD, where I'll be selling my books in the Dealers' Room for the third year! 

Cheers, Donna

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