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From: atel@astronomerstelegram.org
Subject: ATel  17759
Message-Id: <20260420070311.F2396288079F@server.astronomerstelegram.org>
Date: Mon, 20 Apr 2026 03:03:11 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17759							     ATEL #17759

Title:	Follow-up optical linear polarimetric observations of WW Lyn
Author:	Nicolaus Steenken (Sternwarte Freimann), Jan-Uwe Ness (ESA)
Queries:	jan.uwe.ness@esa.int
Posted:	19 Apr 2026; 09:35 UT
Subjects:Optical, Cataclysmic Variable

Following the report of increased X-ray activity in the Cataclysmis Variable
WW Lyn in ATel#17749, a polarimetric observation was conducted on 2026-04-17
(JD 2461148.34). An 11 inch Schmidt-Cassegrain Telescope in Munich was
used equipped with a calibrated Dual Beam Polarimeter described in Nielsen
et al., 2023, A&A, 677, A96 and Steenken et al., 2025 Res. Notes AAS 9
36. 
The data consist of a total of 120 individual frames, with 30 images acquired
at each of the four half-wave plate (HWP) positions. Each frame had an
exposure time of 10 seconds. 
The V-band measurements yield a debiased linear polarization for the target
star of P=0.0 +/- 0.15% (1-sigma), consistent with no measurable linear
polarisation. 
For comparison, the field star TYC2958-1801-1 (V=10.1 mag), measured in
the same field of view, shows a V-band polarization of P=0.18% +/- 0.07%
and PA=145 +/- 20 deg. This is consistent with the expected low interstellar
polarization in this direction.

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