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Robin Leadbeater
 Post subject: WR 140 13.5.08
PostPosted: 14. May 2008, 19:31:15 PM 
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A result from last night compared with Dec07-Jan08

LHIRES 600 l/mm 90min (18x5min) R~3200 S/N 120

(Vega used as "flat". Normalised using linear fit through Marchenko "continuum" wavelengths)

Robin


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Thomas Eversberg
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PostPosted: 14. May 2008, 19:34:58 PM 
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Great, Robin! That looks quite reliable, stable and solid. I'm impressed! :D
I believe that is a god baseline for the periastron passage.

Bye, Thomas
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Lothar Schanne
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PostPosted: 14. May 2008, 20:07:16 PM 
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Hello Robin,

for comparison a spectrum of 12.5.2008, without any normalization. There are some variations around 570 nm.


C14, Lhires III, 40 um slit, 1200 g/mm grating, Sigma 1603ME, 1x1 binning, 4x20min. = 80 min exposition, not normalized, roughly calibrated, S/N = 170 [5970:5990].
FWHM of Na lines(D, 5890 und 5896) 1.52 A -> R >= 3875.


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Robin Leadbeater
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PostPosted: 14. May 2008, 20:56:40 PM 
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Quote:
Hello Robin,

for comparison a spectrum of 12.5.2008, without any normalization. There are some variations around 570 nm.
hello Lothar,

That is interesting. I do not think I am seeing any significant change in my spectrum but your resolution and S/N is a bit better so perhaps you are seeing more than me. Do you have the spectrum as a fits file? I could normalize it in the same way and compare the two.

Best Regards
Robin
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Robin Leadbeater
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PostPosted: 15. May 2008, 12:05:47 PM 
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Hello Lothar,

Thank you for the FITS file. I have made a comparison of the area of interest. (Normalized using points at 5635 and 5755A.)

Are there any real changes yet? I am not sure.

Note 5635 is not a Marchenko continuum point. This is the reason for the slope in the top of the emission line but I do not have the Marchenko point below this in my spectrum and I did not get a good comparison by extrapolating from the higher points. (I think there is a problem with the way Vspec calculates the spline fit. It sometimes includes points at the edges of the profile which it should not. I need to talk to Valerie about it)

Best Regards
Robin


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Lothar Schanne
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PostPosted: 15. May 2008, 17:06:32 PM 
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Quote:
Are there any real changes yet? I am not sure.
Hi Robin,

no, I believe also, there is no significant change.

But ist is interesting to see the good overlapping of our spectra in spite of the different setups. That makes me happy ! :D

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