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To: stefano@bicar.it
From: atel@astronomerstelegram.org
Subject: ATel  17805
Message-Id: <20260519070249.E54FC2880805@server.astronomerstelegram.org>
Date: Tue, 19 May 2026 03:02:49 -0400 (EDT)

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Posted: Within the last 24 hours
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ATEL #17805							     ATEL #17805

Title:	Spectroscopy of the Nova AT2026clk obtained in France
Author:	C. Buil, M. Dennefeld, on behalf of the RAPAS group
Queries:	dennefeld@iap.fr
Posted:	18 May 2026; 12:05 UT
Subjects:Optical, Nova, Transient

Spectra of AT2026clk were obtained on May17, 2026, by C.Buil (from the
STAROS project, and member of RAPAS) with his 0.2m Newton telescope located
at Antibes in the south of France. The telescope was equiped with a TinyStar'Ex
spectrograph, and two gratings were used, one in the blue, and one in the
far red, with a spectral resolution of 1250, covering a total spectral
range from 450 to 940nm. The spectrum is typical of a nova in an early
phase, with a heavily reddened continuum.  Prominent lines of Hydrogen,
Helium and OI dominate the spectrum, showing typical PCygni profiles indicating
an expansion velocity of ~1800 km/s. Lines of NI,CI,MgII, etc. show multiple
components, confirming the findings of Frostig et al. (ATel 17801), but
those components are not seen in Hydrogen or OI. The Halpha over Hbeta
ratio is measured at 47, indicating heavy reddening, part of which must
be due to our own Galaxy (galactic latitude of 2.5 degrees). The ratio
of OI lines 844/777 nm is measured at 3.5, suggesting the Nova is of the
FeII type (Williams, 1998) although no FeII lines are seen    (yet ?).
This is confirmed by another spectrum obtained on May 18th at OHP with
the 1.93m telescope and its Mistral spectrograph (R~700). It will be interesting
to follow this object further, to see if FeII lines appear later (as suggested
by Aydi et al. 2024), although the heavy reddening will make the detection
of FeII lines in the blue part of the spectrum more difficult.

RAPAS is a ProAm collaboration created by T. Midavaine (SAF), W. Thuillot
(Paris Observatory-PSL) and M. Dennefeld (IAP/CNRS and Sorbonne U.) and
funded by Paris Observatory under an API initiative of its Scientific Council
(http://rapas.imcce.fr). STAROS is a group aiming at developing instrumentation
for Amateurs Astronomers (https://staros-projects.org).

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