Dear colleagues,

I would forward a request e-mail from Prof. Klaus Beuermann.

Best regards, Daisaku Nogami --- Daisaku NOGAMI nogami@kusastro.kyoto-u.ac.jp

Begin forwarded message:

Date: Tue, 2 Nov 2021 08:58:45 +0100 From: Klaus Beuermann k.beuermann@t-online.de To: vsnet-ecl-owner@ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-adm 210582] planetary hypothesis for O-C variations of CVs and PCEBs

Dear colleagues,

I am working on the cause of the substantial O-C variations in cataclysmic variables and post-common-envelope binaries. I am sure, you have observations of at least some of the objects, we are following up and I wounder, how I can access such data of yours, which requires to search for an object by name or coordinates.

Currently I am interested in HU Aqr, NN Ser, HW Vir, QS Vir, V470 Cam=HS0705+66, CSS080502, CSS06653, CSS041631 WD1333, . . .

Would your group be able to provide eclipse data (raw light curves or mid eclipse times) on such objects?

Thanks in advance______ Klaus Beuermann

Institute for Astrophysics (formerly Goettingen Observatory), Goettingen, Germany