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ATEL #6043 : Detection of a large increase of the size of the Be disk from the X-ray binary A 0535+262
http://www.astronomerstelegram.org/?read=6043

1A 0535+262 = HD 245770 = V725 Tau
Mag V = 9.2

I've take a spectrum of this Be star this night.

I process the spectrum tomorrow...

Here's a spectrum of this Be star taken last night.
I Put it on Bess database.

Olivier

Hi all, a spectrum of April 7 with Lhires III 1200 (submitted on BeSS):



Paolo

I just read from Atel #8487 that for the peculiar Be/X-ray Binary A0535+262/V725 Tau is expecting an X-ray outburst (the system is a strange beast, a strong X-ray emitter due to accrection of matter from the O9 companion onto a neutron star). I don't know how the event impacts in the optical spectrum but I saw, again in Atel messages, several related observation of H-alpha line (EW, FWHM, V/R trend). I hope something is within reach of amateur equipments. There are only three optical spectra in BeSS database until now.

Ref. http://www.astronomerstelegram.org/?read=8487

Paolo

Dear Paolo,

I've taken an hour for it on 31-DEC: and tried VSpec Gauss fit to measure EW, but I'm new to this process and result varied highly upon selecting an interval.
I'll send it to the ARAS DB along with other bunch of spectra I'm reviweing at the moment.

Did a 2nd shoot some hours later (seems as if the line shape had changed), but don't dare to publish it due to sky conditions and poor SNR.

Possibly needs others to shoot it further (at any resolution), I'm serivcing my eq6 mechanics these weeks and + sky/fog conditions are not the best.

Cheers,
Peter

Very good spectrum Peter! Not easy with that resolving power. The line shape has changed a lot but my mid-res observation is very old (april 2014). Very interesting the fast changes you detected, we could try time resolved spectroscopy (I think I'll use the 1200 l/mm grating).

Here the weather is very bad so I cannot observe too. In a few days should improve (I hope). Meanwhile let's check the Astronomer's telegram.

Paolo

Hello,
Here attached our contribution in the follow-up of this star HD 245770 or V 725 Tau with its peculiarity of the line He I 5876 A.
Cordially
Yolande Buchet
Gérard Martineau

Bonjour,
Ci jointe notre contribution dans le suivi de cette étoile HD 245770 ou V 725 Tau avec sa particularité de la raie He I 5876 A.
Cordialement
Yolande Buchet
Gérard Martineau