MWC728

[Tony Rodda]

Hi guys,

I'm new to this so please bear with me.

I enjoyed Steve Shore's article on "new Be targets" in the February Information Letter.

Here's an attempt at MWC728. What are the small emission peaks around 588, 569 & 577 nm? (Fe?).

MWC728.png (59.34 KiB) Viewed 4983 times

I have recently sent my first spectrum to Francois for the ARAS database.
Where should I register this spectrum if it's not listed in the database?

Apologies for the dumb questions in advance.

Regards

Tony

[Francois Teyssier]

Hi Tony,
I can add a page for MWC728
Note that Steve called for B{e] stars
The Classical Be and Herbig Ae/Be spectra are stored in BESS data base http://basebe.obspm.fr/basebe/

François

[Robin Leadbeater]

Hi Tony,

Thanks for posting this. It introduces a new type of star I was not aware of before. The H alpha emission is very strong so it could be interesting for beginners with the Star Analyser too. The [e] designates that the star shows the forbidden emission lines your spectrum also shows, which only form in very low density regions (Like the famous [OIII] emission in planetary nebulae for example).

Cheers
Robin

[Robin Leadbeater]

Hi again Tony,

Apart from a very weak HeI at 5876A I could not see any reference to emission lines in that region in this reference for example
http://simbad.u-strasbg.fr/simbad/sim-r ... .809..129M
but the [OI] lines mentioned at 6300A 6364A are not obvious in your spectrum
So I am wondering if the emission lines in your spectrum could be residual sky lines from light pollution perhaps? (Could the lines at ~5880 for example be the Na D line?)

Cheers
Robin

[Tony Rodda]

Hi Robin,

Thanks for the response (once again).

Firstly, thanks for the paper. Very good intro to these objects. It explained a great deal.

My local 'light pollution' has changed recently from sodium street lights to LED and I'm still assessing the 'damage'.
So its unlikely to be an Na effect on that basis (unless it's just a general 'wash' in the sky).

I've tried a few different binning options when processing but nothing changes much.

I'll attempt another obs asap at different alt/az and see if it changes.

Regards

Tony