Alert Notice 650 - REVISED: Photometry and spectroscopy of more symbiotic candidates requested
This replaces the text of AAVSO Alert Notice 650 issued earlier on Spetember 14, 2018. - E. O. Waagen, AAVSO
symbiotic variable
Alert Notice 639: CH Cyg coverage requested
Note from Aril 2020: Ongoing coverage continues to be extremely important, with V and particularly B being given priority over Rc and Ic. As always, visual observations are requested and encouraged. - Elizabeth O. Waagen, April 6, 2020
Note from August 2019: Ongoing coverage is extremely important, with V and particularly B being given priority over Rc and Ic. As always, visual observations are requested and encouraged. - Elizabeth O. Waagen, August 28, 2019
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."
Special Notice #70: Brightening of the symbiotic star AG Draconis
October 3, 2007: It was reported in CBET 1091 by U. Munari et al. that the symbiotic star AG Draconis is again in outburst following the decline from its April 2006 bright outburst. They note that the decline apparently halted on 2007 July 07, and has since brightened steadily. Their observations place AG Dra at V = 8.98 on 2007 September 30.8 UT (B = 9.69 and B-V = +0.71). They also note the presence of strong hydrogen and helium emission lines.
Special Notice #64: FN Sgr AND VZ Sgr
September 7, 2007
SYMBIOTIC VARIABLE 1848-19 FN SGR ACTIVE
Special Notice #112: Support for CH Cygni observations with HST and Chandra
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June 7, 2008
Special Notice #121: Outburst of the symbiotic star CI Cygni
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August 31, 2008
Special Notice #152: Increased activity in the symbiotic star AX Persei
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AAVSO Special Notice #152
Increas
Special Notice #168: Outburst of the symbiotic star Z Andromedae
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AAVSO Special Notice #168
Outburs
Alert Notice 171: 2252-36 SN 1993L in IC 5270 AND Request to monitor SS Cyg and AD Leo for ASCA mission AND VY Aqr outburst AND BZ UMa outburst AND Supernova 1993J in NGC 3031 AND Nova Oph 1993 [V2295 Oph] AND 1809-00 FG Ser (AS 296) (Desig revised)
THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
BITNET: aavso@cfa8 SPAN: nssdca::cfa8::aavso
INTERNET: aavso@cfa0.harvard.edu
Tel. 617-354-0484 FAX 617-354-0665
AAVSO ALERT NOTICE 171 (May 5,1993)
2252-36 SN 1993L in IC 5270