[vsnet-chat 2898] (fwd) CI Aql and eclipses (Greaves)

[Taichi Kato <tkato>]

(fwd) CI Aql and eclipses (Greaves)

Date: Fri, 05 May 2000 19:31:52 +0000
From: JG <jgts@jgws.totalserve.co.uk>
Subject: CI Aql eclipses

I'd just like to remind time resolution photometrists that when CI Aql
eventually returns to eclipsing again they should note that IBVS 4232's
folded lightcurve suggests that there is also a secondary eclipse of 0.2
mag or less at "quiescence". So, on eclipse return, don't be too shocked if
soon afterwards you start to get a dip halfway twixt two primary eclipse
predictions.

Which raises the question as to how many of the known eclipsing DNe &
classical novae have measurable secondary eclipses? This to some extent
suggests a high orbital inclination and a secondary not that dissimilar in
luminosity to the quiescent primary [assuming the accretion disc is the
brightest part of the system even at quiscence]. No wonder they decided it
was "just" an Algol!

NB According to an index at www.eso.org, ESO Messenger 69, 42 does include
CI Aql in a low resolution spectrophotometric survey of suspected novae.
Unfortunately no on-line archival copies of the messenger are available
prior to number 80.

Cheers

John

John Greaves
UK

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