Emission-line Star BD+35 111 brightens

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Emission-line Star BD+35 111 brightens

Postby Robin Leadbeater » Wed Feb 19, 2020 3:44 pm

Gaia reports that the 10th mag Emission-line Star BD+35 1111 has brightened by 0.4mag
https://wis-tns.weizmann.ac.il/object/2020cwi

It is not in the AAVSO VSX catalogue and the only references I can find in ADS are to catalogues of H alpha emission objects so it is not clear what it is. It could be an interesting target for spectroscopy, perhaps bright enough even for high resolution.

Cheers
Robin
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Re: Emission-line Star BD+35 111 brightens

Postby Forrest Sims » Thu Feb 20, 2020 7:12 am

HI Robin,

I bit on this one. Here is a spectrum taken last night with my LISA. (9) 300 sec exposures. The Balmer lines are clear with Alpha in emission as you described. The Na lines are clearly visible as well as numerous lines that I think are HeI. I will upload the spectrum to the BAA database as soon as I can figure out how it should be categorized.

Cheers!
Woody
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bd+35111_20200220_173_Forrest Sims annotated.png
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Re: Emission-line Star BD+35 111 brightens

Postby Robin Leadbeater » Thu Feb 20, 2020 3:31 pm

Nice interesting spectrum. I have now found this reference (not in the references listed in SIMBAD)
https://ui.adsabs.harvard.edu/abs/2014A ... S/abstract
where it is classed as an irregular variable with spectral type B2Ve (ie could be a classical Be star) with significant extinction E(B-V) ~ 0.5 which I say would fit the description of your spectrum.

I guess you could add it to the BAA database as either a Be star candidate or under the catch all "variable of unknown type" Your call ;-)

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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Re: Emission-line Star BD+35 111 brightens

Postby Frederic Pastor » Sun Feb 23, 2020 8:59 am

Hi all,

Here is my humble contribution.

Couldn't obtain a better resolution, when I compare with the nice spectra of Forrest. And the catch was a bit more complicated than thought (in the middle of M38, with similar Magnitude star around BD+35 1111) ;)

That said, we may find hopefully the Balmer lines + Na lines. And the clear Ha emission.

Many thanks for your article Robin.

Fred
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BD+35 1111.jpg
BD+35 1111 taken last 22nd Feb 2020
BD+35 1111.jpg (72.6 KiB) Viewed 2071 times
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