eta carinae spectrum

[bojan]

Spectrum, taken Jan 5th from Mt Waverley, by way of SA100 (grism) and C11.

For comparison, I attached the one taken in 2016, with same camera (scope was different (MTO 10_1100) and grism was closer to sensor)

[JimsShed]

Hi Bojan,
Interesting changes in values. Can you suggest any reading matter that would help in understanding or interpreting these values.

Thanks, Jim

[skysurfer]

It appears to me that the brightness of Eta has increased a little since last year. As a northerner, I arrived in Oz last Friday night and I pointed my binos to the star tonight and it was considerably brighter than the three surrounding stars forming a triangle s, p and u Carinae. Last time I saw it (Mar 2019) it appeared fainter.

Is that really true ?

[bojan]

Wikipedia has a lot of details:
https://en.wikipedia.org/wiki/Eta_Carinae
As to differences in spectra, resolution and scale are too different to directly compare them. Also, IR part is very dependent on local (atmospheric) conditions..

[Domino]

Thanks for sharing those pics. An interesting comparison.