Observations of the RRc variable LINEAR 1169665 with the robotic telescope TAROT. (arXiv:1902.00905v1 [astro-ph.SR])

Observations of the RRc variable LINEAR 1169665 with the robotic telescope TAROT. (arXiv:1902.00905v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Borgne_J/0/1/0/all/0/1">J.F. Le Borgne</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Klotz_A/0/1/0/all/0/1">A. Klotz</a>

LINEAR 1169665 is a RR Lyrae of sub-type c discovered by the asteroid survey
LINEAR. The robotic telescope TAROT at Calern Observatory has observed it
between the years 2006 and 2015. The present study of TAROT data as well as
those from the surveys ASAS-SN (2012-2019) and LINEAR (2002-2008) shows that
this star presents a period modulation with a period of 1800.1 days (4.9 years)
but with no significant variation of magnitude at maximum. This phenomenon is
similar to the one found in KEPLER data for the RRc KIC 2831097 (Sodor et al.,
2017) which was suspected to be the result of a light time effect in a double
stellar system. The large modulation period and the lack of amplitude
modulation exclude it to be attributed to a Blazhko effect. But alternatively
to the light time effect this phenomenon might be due to a new modulation
phenomenon with long period affecting at least RRc stars.

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