Strange star in M27

[photoncraft]

Hi

I found some strange star in M27. Recently I modified my Z6 and shot m27.

before i took picture with Sony a7s and Nikon D800E.

ANd some days ago I compared 3 files and Nikon Z6 image have new star.

Is this star only showing in more ha wave or new appears between at least 2019 and 2021?

I Attached compare image

What's your think about this?

[Wiu-Wiu]

There is a very red star in other images at that location. Probably your modded DSLR picks up more of this band than the other ones. 

 

https://www.ing.iac.es/PR/science/m27.html

 

 

[photoncraft]

17 minutes ago, Wiu-Wiu said:

There is a very red star in other images at that location. Probably your modded DSLR picks up more of this band than the other ones. 

 

https://www.ing.iac.es/PR/science/m27.html

 

 

Thanks for link!

it's really red star compare another.

[newbie alert]

Could be a hot pixel

[Astroscot2]

There are a number of variable stars in M27, could be one of them?

[ollypenrice]

It shows very clearly in my 2017 Ha-OIII-LRGB version...

My image's best fit is with your 2021 rendition.

Olly

 

[gorann]

Also present in my processing of 2016 Liverpool telescope data👍

[Martin Meredith]

According to Aladin, that is the Mira-type variable star V571 Vul. There's some info (in German) here: http://www.astro-photos.net/CCD/M27_cctv.html which Google translates to:

In the northwestern part of M 27 there is a long-period variable Red Giant of the Mira type. It changes its brightness from 17.5 mag to 14 mag with a period length of 214 days. The official name is V571 Vul, the 571st variable star discovered in the constellation Foxes (Latin Vulpecula). The star discovered in 1990 by the Czech amateur astronomer Leos Ondra is known under the much prettier name Goldilocks Variabler. The history of discovery is also pretty. Two astronomy magazines published a picture of M 27 on their front pages, but they were taken at different times. Ondra noticed that a red star was shining in one shot, which was obviously missing in the other shot.