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multiwavelength observations

Alert Notice 502: EE Cep observations requested for upcoming eclipse

July 9, 2014: The AAVSO requests observations for the upcoming eclipse of EE Cephei, a long-period eclipsing variable. EE Cep has a period of 2,050 days, and shows strong variations in the eclipse light curve from one event to the next. Observations are needed to study the morphology of the upcoming eclipse, which will be used to better understand the shape of the eclipsing disk and how it precesses. Mid-eclipse is predicted to be August 23, 2014, but the early stages of the eclipse may begin as much as a month earlier.

Alert Notice 277: 0526-70 Nova LMC 2000 in the Large Magellanic Cloud AND 2138+43 SS Cygni multiwavelength observations rescheduled

 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 277 (July 13, 2000)

0526-70  NOVA LMC 2000 IN THE LARGE MAGELLANIC CLOUD

Alert Notice 433: Request for observations of GW Lib in support of HST observations

March 20, 2011: Dr. Paula Szkody, University of Washington, has requested our help in monitoring the cataclysmic variable GW Lib for upcoming Hubble Space Telescope observations, scheduled to be made during the week of 2011 April 7-11 UT. Dr. Szkody also observed this object with HST in March 2010 (see AAVSO Alert Notice 417).

Alert Notice 431: Request to monitor SDSS074545 for HST Observations

February 25, 2011: Dr. Paula Szkody (University of Washington) has requested our help in monitoring the cataclysmic variable SDSS074545 (SDSS J074531.91+453829.5) for upcoming Hubble Space Telescope observations. The HST observations are scheduled to be made during the week of 2011 March 7-14. Dr. Szkody also observed this object with HST in October-November 2007 (see AAVSO Alert Notice 359).

Special Notice #231: T Pyx Observations Requested

February 1, 2011: Sumner Starrfield (Arizona State University) has informed us that Chandra is currently observing the cataclysmic variable T Pyx.  He and his colleagues would like supporting optical monitoring of the star during the visitation.  One visit is happening now; the next and final visit will occur on February 5 (UT).

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