Call for observation for a new variable star

Information about outbursts of eruptive stars, Be activity, ...

Call for observation for a new variable star

Postby Olivier GARDE » Mon Mar 02, 2020 4:53 pm

Matthieu Conjat has found a variable in his images that is not listed as a "variable star".
You can have a look on his post on this forum (sorry in French only) but you can see an animation on this variable target :
http://www.astrosurf.com/topic/133277-variable-éruptive-dans-m81/

The coordinates of this very faint target (around mag 15,9) are :
alpha 09 56 13.83
delta +68 57 24.05

Low resolution spectra are welcome to identify this target and you can post yours result here in the aras forum.
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: Call for observation for a new variable star

Postby Robin Leadbeater » Mon Mar 02, 2020 6:00 pm

It looks similar in timescale and magnitude change to these kind of events
http://www.threehillsobservatory.co.uk/ ... ra_42a.htm
https://stargazerslounge.com/topic/3456 ... cond-flare

Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: Call for observation for a new variable star

Postby Andrew Smith » Mon Mar 02, 2020 10:27 pm

Certainly looks similar Robin, it is too faint for my slitless system. I assume you will try for a spectrum.
Regards Andrew
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Re: Call for observation for a new variable star

Postby Robin Leadbeater » Tue Mar 03, 2020 11:19 am

Andrew Smith wrote: I assume you will try for a spectrum.


If I ever get to see the stars again ! With this weather I have only observed on 6 nights so far this year and I think only none with conditions good enough for faint objects like this :(
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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Re: Call for observation for a new variable star

Postby Andrew Smith » Tue Mar 03, 2020 12:25 pm

Robin Leadbeater wrote:
Andrew Smith wrote: I assume you will try for a spectrum.


If I ever get to see the stars again ! With this weather I have only observed on 6 nights so far this year and I think only none with conditions good enough for faint objects like this :(


Yes that's why I decided to take the rig to Pixelskies in Castillejar! I got 15 full nights in Jan and 19 in Feb :)
Regards Andrew
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Re: Call for observation for a new variable star

Postby Robin Leadbeater » Thu Mar 05, 2020 6:39 pm

An extremely noisy (SNR~3 :o ) ALPY 600 spectrum last night suggests an M type star (M3?)

Red - Pickles M3v

sdssj095613p77_685723p9_20200304_981_Leadbeater.png
sdssj095613p77_685723p9_20200304_981_Leadbeater.png (29.23 KiB) Viewed 2581 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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Re: Call for observation for a new variable star

Postby Andrew Smith » Thu Mar 05, 2020 11:16 pm

Well done on such a faint star Robin, even with that SN ratio it looks fairly conclusive.
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Re: Call for observation for a new variable star

Postby Robin Leadbeater » Fri Mar 06, 2020 11:24 am

Thanks Andrew,

It was much harder than I expected. I recorded SN 2020ue at mag 14.5 and higher air mass the same night and got an SNR of ~30 so at mag 16 I expected an SNR of ~15. Either it is a fair bit fainter than that or the bright moonlight had a greater effect.

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
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Re: Call for observation for a new variable star

Postby Robin Leadbeater » Fri Mar 06, 2020 11:51 am

OK I see on the astrosurf forum it has been remeasured at V mag 17 (though brighter in the red) so this is the faintest object I have recorded with the ALPY in its standard configuration.

Olivier, can you post a link to my spectrum in the astrosurf thread ?

Here is the guider image

sdssj095613p77_685723p9_20200303_guider.png
sdssj095613p77_685723p9_20200303_guider.png (229.97 KiB) Viewed 2531 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Robin Leadbeater
 
Posts: 1551
Joined: Mon Sep 26, 2011 4:41 pm

Re: Call for observation for a new variable star

Postby Olivier GARDE » Fri Mar 06, 2020 3:03 pm

Robin Leadbeater wrote:Olivier, can you post a link to my spectrum in the astrosurf thread ?


Robin,

I dit it.
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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