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SN in M33?

xordi
10 Oct, 2019 20:22
I found a star on the recent M33 images which was not there earlier. How it can be checked what is it? Is it kind of variable star?
Simbad gives the following result: Simbad
There is a WR star near by, however it is not displayed on the AladinLite view, so it cannot be confirmed based on that.

I marked the star on the below image, it is very near to the center.

Recent images for example:
https://astrob.in/yqr8xe/C/
https://astrob.in/2fz4sh/0/

Older images for example:
https://astrob.in/320026/B/
https://astrob.in/87869/0/

Edited 10 Oct, 2019 22:19
strudolyubov
11 Oct, 2019 03:34
Hi Xordi,

Nice catch! Looks like one of the luminous variables or maybe even a nova. Did you try to estimate its magnitude based on the comparison of its photon count with that of the nearby catalogued stars? If you have good astrometry (coordinates), you can try to run advanced Visier catalog search. Based on the approximate position from your image (01:33:52.504, +30:44:39.39), there are 5 catalogued stars from LGGS Survey (Massey et al. 2007) within 10" radius (all 20-22 V_mag). One of them is indeed a WR candidate. You can also check the LGGS Survey images of the central region of M33 (obtained with 4-m Mayall Telescope on Kitt Peak) in different spectral bands (large files, gzipped FITS format):

http://www2.lowell.edu/users/massey/lgsurvey.html                                       (general survey information)
ftp://ftp.lowell.edu/pub/massey/lgsurvey/datarelease/M33/Center/           (image data for central region of M33)

Also, here is the link to a deep image of M33 obtained with one of the VLT telescopes (VST) to get a detailed view (look for a 650 Mb full-size version):

https://www.eso.org/public/images/eso1424a/

CS
Sergey
xordi
11 Oct, 2019 09:17
Thank you for the info Sergey!

I have compared with VST ( it is a very detailed  photo) and the result is the same, the stars appears as new and quite bright compared to neighbours.

https://astrophotonotes.com/images/m33_vari/vst.gif

In AAVSO and GCVS nothing is displayed for those coordinates.

Query: center= 013352.508 +304439.40, radius= 60
No variable star could be found.
The end
Die_Launische_Diva
11 Oct, 2019 10:10
AT2019qml?  R.A. = 01h33m52s.710, Dec. = +30°44'35".90

Please take a look at http://www.rochesterastronomy.org/snimages/updates.html
xordi
11 Oct, 2019 10:15
@Die Launische Diva, thank you!!

This is it. In the mean time it got much brighter.
Die_Launische_Diva
11 Oct, 2019 10:19
Congratulations! Excellent catch!
xordi
11 Oct, 2019 10:31
Thanks a lot for this link to the novae updates, I saved for future cases.
Edited 11 Oct, 2019 10:47
astrojeff
11 Oct, 2019 11:36
Nice Job, trying to find it as well.  Do you have a wider view?
xordi
11 Oct, 2019 11:45
Yes Jeff,pls find below:

strudolyubov
11 Oct, 2019 16:12
@Xordi
Congrats!

From the measurements prior to Sept. 30, it looked like it was fading. Would be interesting to see what it is going to do next, especially if it is brightening now.

CS
Sergey
xordi
11 Oct, 2019 17:10
Thanks Sergey! Your initial assumption was correct.
VicV
yesterday, 12:03
Thanks for posting this!
I was blinking my M33 data last month and found the new star as well.
However, I didn't know how to check if it was a nova.

xordi
yesterday, 20:16
@Victor,  very  nice! On your version it is just 2 days old!

For checking novas, you can find a link above in this thread and here is another one IAU.
Edited yesterday, 20:16
 
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