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IQ Eri outburst

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lmk
lmk's picture
IQ Eri outburst

Found it about v~13.0 last night. I have it noted as an atypical dwarf nova or IP. Anyone have more background on this star?

Mike LMK

lmk
lmk's picture
double peak?

Maybe its the double peak in the 2008 outburst thats so strange? But then, its apparent because of just two different observers (DWI and SWIL), could they have a significant offset error responsible, or is this behavior real?

Mike LMK

pukemaru
pukemaru's picture
IQ Eri

Mike, what magnitudes are we talking about here for the two observers?(I see one was 13.0) The AAVSO Special Notice #140 29 Dec 2008 notes large amplitude variations of up to 0.65 mag (Monnard), and up to 1 mag (Bonnardeau)

This appears to be only the second recorded outburst.

Stephen HSP

FJQ
FJQ's picture
IQ Eri

To: Mike,

Will try to squeeze this one out tonight.  My target list is getting crowded so i'll have to stop observing objects west of 23:00 RA.  Now for the "fun" of reducing 25 different variable star CCD V & B mags over the last 4 months...hope to be done with this before my next 4 month cycle is over on 30Apr13!

James

lmk
lmk's picture
variations between observers or real?

Stephen, The two observers I am referring to are DSI:

http://www.aavso.org/lcg/plot?auid=000-BFQ-140&starname=IQ%20ERI&lastday...

and SWIL:

http://www.aavso.org/lcg/plot?auid=000-BFQ-140&starname=IQ%20ERI&lastday...

Despite the one magnitude short term variations in the time series, the two observers either show a (1) distinct double peak in the outburst in V around 01/01/2009 or (2) a significant zero-point offset about an additional magnitude in V !

So, I was hoping we could resolve this issue during the current outburst, by consistent measurements.

Mike LMK

lmk
lmk's picture
Lack of interest in this var

I estimated it v=13.9 last night, so looks like the outburst is ending. Since no other observer submitted any positive estimates during the outburst, I must conclude there is no interest in this variable and I will drop it from my program :(

Mike LMK

stubbo
stubbo's picture
IQ Eri

Hi Mike,

Been watching this star from the start and have obs on Dec 21, 15.3. 22, 15.2. 30, 13.0. Jan 2, 12.6. 3,12.9. 4, 13.8 and last night 13.0! I wonder what it will be tonight, so don't give up on it just yet.

Rod.

 

FJQ
FJQ's picture
IQ Eri

To:  Mike,

Like I mentioned on 31-Dec12,  I started to shoot this.  Will submit my data after this post.  This is an object best shot by our Southern observers, since its so low on our horizon.  Well you weren't hallucinating it got a little brighter than 12.5!  I used 1 reference and 5 comp stars to derive Vmags with an uncertainty (1/SNR) of 0.003-0.008 Vmag over 3 days of observation. Looks like its fading.  Will continue watching it if my other deep southern variable, CL Pup, doesn't get neglected.  Here is a graph of IQ Eri's 3-day behavior.  Thanks for the head-up BTW!

James, Los Angeles, CA

lmk
lmk's picture
Maybe multiple peaks?

Thanks Rod and James! Yes, it does look now like it has rebrightened, so maybe the "double peak" of 2008 is real.

If you could upload all your obs into Webobs it would really help visualize it in LCG...

Yes, it may indeed be an unusual outburster and worth closer examination by the pros :)

Mike LMK

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