28 CMa outburst

[Olivier GARDE]

According to the alert message of Valerie, here's a spectrum of 28 CMa taken last night in difficult situation :
- Low target in the sky
- some fog during shooting.

[Paul Luckas]

A spectrum taken early this morning local time with the object overhead but under poor seeing.
R ~ 13,000
S/N > 300

I've uploaded it to BeSS.

Paul

_hd56139_20151103_786_Paul Luckas.png (3.19 KiB) Viewed 9182 times

[Benjamin Mauclaire]

Hello Paul,

Nice spectrum.
Is it a normalized spectrum?
It's important to let continuum's shape natural, it could give informations.

As your wavelength bandwidth is wide enougth, I should put Ha line at a bit blue edge to get He 6678 line.

Cheers,

Benji

[Paul Luckas]

Hi Benji,

No continuum removal. Just IR correction.

Cheers,

Paul

[Ken Harrison]

Paul,
Well done!
Good spectrum.

[Paul Luckas]

Another Lhires spectrum submitted to BeSS this morning. R ~ 14,000 @ 6532Å, S/N > 300.

The attached plot shows a comparison with last week's upload.

Paul

28CMa.png (4.47 KiB) Viewed 9062 times

[Thierry Lemoult]

Hello

I took a new spectrum of 28 Cma last night and the night before. The Ha emission continusly increase. Relative continuous: more than 5 unit now.
LHIRES 2400T, Telescope Newton 200mm. R=17000. From Abu dhabi, lat=25°N. This star is high is the sky. Alt=35°

cmp-lemoult-DongLi.png (5.42 KiB) Viewed 8949 times

[Olivier GARDE]

28 Cma taken the 18th March with eShel spectrograph and comparaison from my last spectrum taken in november 2015 (with heliocentric velocity correction)

H Alpha


H Beta


H Gamma