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symbiotic variable

Alert Notice 309: FUSE satellite observations scheduled for 0409-71 VW Hyi AND Outburst of 2328+48 Z And

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
INTERNET: aavso@aavso.org
Tel. 617-354-0484 Fax 617-354-0665

AAVSO ALERT NOTICE 309 (July 27, 2004)

SUBJECTS:

1. FUSE SATELLITE OBSERVATIONS SCHEDULED FOR 0409-71 VW HYDRI
2. OUTBURST OF 2328+48 Z ANDROMEDAE

1. FUSE SATELLITE OBSERVATIONS SCHEDULED FOR 0409-71 VW HYDRI

Alert Notice 321: Multicolor CCD campaign for AS 325 to support Spitzer observations

July 13, 2005

Summary
We request nightly BVRI CCD observations of the symbiotic eclipsing binary star AS 325 until December 1, 2005. The goal of the campaign is to determine the nature of this enigmatic system by looking for changes in color during the current eclipse and also to support upcoming observations with the Spitzer Space Telescope planned for September.

AS 325 is at R.A. = 18:50:03.6 Dec. = -26:24:18 (2000).

Alert Notice 382: Outburst of the symbiotic star CI Cygni

August 31, 2008 : Further to AAVSO Special Notice #121, we urgently request visual
observations and instrumental photometry of the outbursting symbiotic variable star CI Cygni, beginning immediately (2008 August 31; JD 2454710) and continuing for at least the next several weeks as the outburst evolves.

Alert Notice 419: Nova eruption in V407 Cyg

March 15, 2010: According to CBET 2199, 2204, and 2205, the suspected symbiotic star V407 Cyg has been observed in an anomalously bright outburst, and subsequent spectroscopic observations by multiple observers show clear signs of a classical nova. Observations of this anomalous event are requested immediately, and observers are asked to continue observing this object until it returns to its previous quiescent level.

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AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484