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R Aqr

Alert Notice 665: R Aqr observations needed urgently

April 19, 2019:  Dr. Lee Anne Willson (Iowa State University) is urgently requesting observations of the symbiotic Mira R Aqr, particularly from our Southern observers, before it enters its seasonal gap.

Dr. Willson writes: "The current minimum is low [V~11.7], and possibly even [low] in R and I, so we may be seeing the start of the eclipse/interaction event that [occurs every 44 years and] should be centered around 2022 to 2024 and lasts about 6 years. Thus more observations near minimum would be particularly useful at this time!

Alert Notice 600: Dates for R Aqr Chandra and HST observations

October 1, 2017 : Further to AAVSO Alert Notice 589, the likely windows for the Chandra and HST observations of the symbiotic variable R Aqr have been set as follow:

Chandra: 2017 October 11 - October 15
HST: 2017 October 13

Alert Notice 589: R Aqr coverage needed for HST and Chandra observations

Note: This campaign has been extended through the 2018 observing season.

August 4, 2017: Dr. Margarita Karovska (Harvard-Smithsonian Center for Astrophysics) has requested "visual, photometric, and spectroscopic observations of the symbiotic variable R Aqr in preparation for and in support of Chandra and HST observations currently scheduled for October 2017."

Alert Notice 535: R Aqr observing campaign

Ongoing visual, photometric, and spectroscopic observations of R Aqr about once every 10 days are requested, both to detect and observe the next eclipse and to continue the light curve of this star that has been in the AAVSO observing program for over a century.   Elizabeth O. Waagen, August 2017, March 2019

R Aqr

December 1, 2015

The long period variable R Aquarii is an extremely interesting system. Its type is both Mira (M) and symbiotic (ZAND) - R Aqr is a close binary system consisting of a hot star and a late-type star, both enveloped in nebulosity. In the case of R Aqr, the late-type star is a Mira. As a result, the very interesting light curve shows not only the Mira pulsation but also eclipses as the two stars interact.

R Aquarii

R Aquarii: First and Foremost

Artist's<br />
Conception of R Aqr
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