Circumbinary Dust in Magnetic Cataclysmic Variables - Bright State of AM Her

Details Circumbinary Dust in Magnetic Cataclysmic Variables - Bright State of AM Her Circumbinary Dust in Magnetic Cataclysmic Variables - Bright State of AM Her

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop..299h&link_type=abstract

Spitzer Proposal ID #299

Physics

Scientific paper

Observations by the AAVSO during the past several days of the polar AM Herculis show that it may be leaving the "normal" faint state it has occupied during the past ~2 years, and becoming bright. We observed AM Her with IRAC during GO-3 as part of program 30249. That program also included two medium-impact TOO observations to be triggered to re-observe any target of 30249 that changed brightness state during GO-3 from whatever state it was in when its non-TOO observation for 30249 was made. Unfortunately, those TOOs expired at the end of June, at about the same time that AM Her first started to show an indication that it might be getting bright. So, we are requesting a DDT observation, for the same scientific reasons that the TOO observations were requested (and approved) for program 30249 (to be detailed in a follow-on email to the Spitzer Helpdesk). The target is visible to Spitzer until Dec 2007 - we request the DDT observation during IRAC-43 or IRAC-44, in case the high state is of short duration. Total AOR duration will be ~10 minutes. We have requested that the AAVSO alert its members to intensify observations of AM Her so we can confirm with certainty the rise to bright state within the next few days; in the meantime, please consider this TOO request and notify us if it would be approved. By then, we should know if the rise to bright state is real and should be observed.

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