Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aan...452....1w&link_type=abstract
AAVSO Alert Notice 452
Astronomy and Astrophysics
Astrophysics
Stars: Individual (Su Aur, Ab Aur), Stars: Variables: T Tauri, Herbig Ae/Be
Scientific paper
Dr. Hans Moritz Guenther, Harvard-Smithsonian Center for Astrophysics, has requested bracketing and simultaneous observations in support of XMM-Newton x-ray observations of the classical T Tauri star SU Aur and the close-by Herbig Ae star AB Aur scheduled for February 15 - 17, 2012. The targets are too bright to use the XMM optical monitor for simultaneous monitoring. Dr. Guenther writes, "The scientific goal of the observation is to study the rise and decay of flares in classical T Tauri stars at a relatively high time resolution (less than minutes). Because T Tauri stars are surrounded by an accretion disk and actively accrete matter from the star, there is reason to believe that flares on T Tauri stars behave differently compared to flares on older stars like our sun." The XMM-observations are scheduled for UT 20:31:13 2012 February 15 - 01:27:53 February 17. Optical observations starting a few hours before and lasting a few hours longer would be ideal, but the main focus is the time of the XMM-Newton observation. Photometry should be carried out with exposure times of 1 minute or less (and timing of the telescope clock accurate to the same level). V filter is preferred but any filter is acceptable. Unfiltered observations are not recommended as both stars are red. Nightly observations are also requested from now through February 24 to provide a good context for the simultaneous and bracketing observations. Observations should be submitted to the AAVSO International Database.
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