Alert Notice 820: Photometry and spectroscopy of R Aqr requested for upcoming HST observations
Note: Please continue to observe R Aqr throughout the 2023-2024 observing season. - Elizabeth O. Waagen, August 1, 2023
April 19, 2023
symbiotic variables
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.
AAVSO Bulletin 73 for 2010 21 hr
AAVSO BULLETIN 73 FOR 2010 - 21 HOURS
IMPORTANT NOTICE: Bulletin 73 was NOT prepared in the same way as in the past.
READ THE INTRODUCTION before you use the Bulletin; contact AAVSO Headquarters for more precise dates for research.
# - needs more observations
& - needs more observations urgently
@ - needs more observations very urgently
% - has fair to excellent photometric data but needs visual observations
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| DESIGN.Special Notice #215: Brightening of the symbiotic star CI Cyg
August 24, 2010: Observer Gary Poyner (Birmingham, UK) reports that the symbiotic star CI Cygni has noticeably brightened over the past few days. Poyner reports the star at a magnitude of m(vis)=9.8 on 2010 August 23.92 (JD 2455432.42). CI Cyg has been in a slow rise for several months, beginning immediately after the end of the last outburst. Continued monitoring of CI Cyg over the next several weeks and months will be useful for better understanding the nature of this star system and its outbursts.