magnetic variables

SUBJECTS:

July 14, 2005

XMM-Newton and Earth (Image courtesy of ESA)

Both visual and CCD observations are needed!

HMXB campaign extended until further notice. It has been updated numerous times and covered in AAVSO Alert Notices 348, 354, and 377, and in AAVSO Special Notices #118, #129, #143, #213, and #220.

April 6, 2007

SUBJECTS:

January 6, 2008: Dr. Paula Szkody (University of Washington) has requested our help in monitoring the magnetic cataclysmic variable EF Eri for upcoming Hubble Space Telescope observations. Confirming observations are requested to ensure that EF Eri is fainter than the safe observing threshold during the HST observing window on 2008 January 17 UT.

The observers of the AAVSO are asked to participate in a long-term photometric monitoring campaign on a number of magnetically active dwarf stars, requested by Dr. Styliani (Stella) Kafka of the Department of Terrestrial Magnetism, Carnegie Institute of Washington.  She requests long-term monitoring of these targets with an observing frequency of one observation every three days taken with one or more filters.