CI Cam kraftigt udbrud i det optiske område

[nightskyDeltager Neutron star]

Denne er netop dukket op på Atel #9634

Dette meget spændende binær system er i udbrud. Alle emissionslinjer er kraftigt stigende og
H-alpha er målt til 80 gange mere end normalt flux.

Den dejligt fint i Danmark, så hvis vejret eller vil arte sig er det en oplagt kandidat til
spektroskopi og fotometri.

We report a very strong
optical outburst of the B[e]/transient X-ray system CI Cam/XTE J0421+560.

On
2016 Oct 09.064 we measured H alpha at 80 times the continuum flux level,
similar to the
previous reported outbursts in 1998 (Hynes et al., 2002) and 2005
(Yan et al., 2007). Our
spectroscopic observations ranging from 3800 – 8900 A
(Mercator/HERMES, La Palma) from 09- 15
October show a daily increase in the
strength of nearly all emission lines with the notable exception
of [NII] 5755.

Further multi-wavelength observations are strongly encouraged as the outburst
closely resembles
the spectacular outburst in 1998 over the complete wavelength
range from gamma-ray to radio.
At that epoch the X-ray flux reached a peak
intensity of almost 2 crab, within a day after the onset
(D. Smith et al.,
1998). In 2005 the peak brightness reached V = 11.2 after which it rapidly
declined
in a few months to V = 11.8.

Now the highly disputed distance to CI Cam is settled by GAIA at 1.4 (+0.7
-0.4) kpc, we note that
CI Cam is unlikely a supergiant. This confirms the
earlier designation as B4 III-V[e] for the optical
star with an accreting white
dwarf companion as suggested by Barsukova et al. (2006). The likely
scenario
would be a thermonuclear runaway of accreted matter on the surface of the white
dwarf,
like in a nova outburst (Ishida et al., 2004).

[nightskyDeltager Neutron star]

En Atel #9663 fra i dag henviser til dette spændende dokument.

https://drive.google.com/file/d/0B69X3dQZz5rXQnVRNDFCS1FOVW8/view

http://www.astronomerstelegram.org/?read=9663

[nightskyDeltager Neutron star]

En måling på Ci Cam her til aften giver

T (JD) 2457686.33016 11.436 V mag

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