spectro-aras.com

After three frustrating weeks of cloudy weather here in the southwest UK, it was possible to catch up with the evolution of WR140 as it approaches periastron on November 22nd. The blueshifted emission excess has begun to emerge on the normally flat-topped CIII emission line :

WR140 approaches ...

I think we could expect to see the first blue-shifted excess on the flat-topped CIII emission by October 16th or even earlier, based on what I observed during the last periastron. At the moment the CIII emission is still fairly constant:
WR140 time series 2024 Jan 05 - Sep 17 CIII zoom.png
A ...

Whilst the uncertain eruption of TCrB has become a focus for observation this year, I think the forthcoming periastron of the binary Wolf Rayet star WR140 shouldn’t be neglected. A high-resolution pro-am campaign around the previous periastron in 2016 December resulted in improved orbital elements ...

Hi, I am using an Alpy 600 and have never been able to get an accurate calibration during the six years I've been using it. I normally use ISIS but have switched to Demetra to see if that made any difference. I have played around with different degrees of polynomial and various calibration lines ...

Hi Francois,
Thanks for the work to recover this site, it's great to be back. Here are my Relco calibration details:

Spectroscope: Alpy 600
Calibration lines:
7383.98
7272.94
7147.04
6965.43
6506.53
6266.49
5852.49
5400.56
4764.87
4545.05
4158.59
3946.10
Degree 4 polynomial
Alpy 600 Relco ...

Wonderful to be able to consult and post on the forum again! Thanks so much for all of the hard work to recover from this terrible hack
Cheers
Hugh

I captured another Alpy spectrum of ups Sgr on September 16th which shows that the blue shifted Hα absorption has now faded compared to the last spectrum I captured on August 29th:
upsSgr 2022.08.29-16.09.png
upsSgr 2022.08.29-16.09 Halpha zoom.png
All of the hydrogen Balmer lines appear to have ...

That's a beautiful Doppler shift between your high resolution spectra Guillaume.
I captured another Alpy spectrum on 29th August that shows no sign yet of any weakening in the Hα absorption feature. Here's a comparison with my spectrum taken 23 days previously:

Full wavelength range normalised at ...

Thanks Robin for highlighting this interesting star. Even at the low resolution of my Alpy 600 the apparent P Cygni profile is quite distinct, although at this resolution not the plateau between the Hα emission and absorption visible in Guillaume's high resolution spectrum. For such a hot star the ...

I recently brought together the 46 spectra that I captured 2021 March 22 - 2022 March 22 to paint a spectroscopic portrait of Nova Cas 2021. The results are described in a short paper in the Variable Star Section Circular no.192 just published by the British Astronomical Association, which can be ...