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Old 04-03-2021, 09:38 AM
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astroron (Ron)
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Keep watching Eta Carinae

A very interesting article indeed.

This paragraph is doubly interesting

Quote)
Why is Eta Carinae brightening across all wavelengths? Jon Morse of the University of Colorado notes, "Without question, the central star has brightened since 1997 by roughly a factor of two." Morse continues to explain that if the brightening trend continues, in two years Hubble will be unable to image Eta without saturating because the star will be too bright. No one anticipated that this star would climb to bright magnitudes so soon. And what is stranger is that no one can explain why it is happening across all wavelengths. If the star was only brightening in the visual wavelengths, it might be explained that Eta is shedding an outer layer in response to radiation pressure whereby the star's outer layers cool and its output shifts from ultraviolet to visual wavelengths, however, this is not what is observed. Brightening is occurring across the entire electromagnetic spectrum, implying an intrinsic brightening of Eta Carinae. "And Eta Carinae can't brighten very much," notes Humphreys, "or else it will go boom."



https://www.aavso.org/vsots_etacar?f...cFfg8xhB4-OEyY
Cheers

Last edited by astroron; 04-03-2021 at 02:10 PM.
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Old 04-03-2021, 01:00 PM
AdamJL
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Fascinating, thanks for sharing
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Old 04-03-2021, 05:56 PM
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Thanks Ron. Absorbing and interesting update.

There have been various hypotheses for the eruption in the 1840s e.g. a third star spiralling into one of the other surviving two.

Interesting to see what happens. Maybe a supernova in our lifetime!

Regards, Rob
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Old 05-03-2021, 01:25 PM
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h0ughy (David)
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Tested my new scope out on that last night after reading this. The Star does seem brighter
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Old 05-03-2021, 02:52 PM
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astroron (Ron)
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Quote:
Originally Posted by Robh View Post
Thanks Ron. Absorbing and interesting update.

There have been various hypotheses for the eruption in the 1840s e.g. a third star spiralling into one of the other surviving two.

Interesting to see what happens. Maybe a supernova in our lifetime!

Regards, Rob
Here's hoping Rob.
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Old 11-03-2021, 02:01 PM
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bigjoe (JOSEPH)
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Would be fabulous/inspiring to see something more than mag -4 , brighter than Venus as The one and only Tycho Brahe saw all those years ago.
Bigjoe
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Old 11-03-2021, 04:33 PM
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astroron (Ron)
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Would be fabulous/inspiring to see something more than mag -4 , brighter than Venus as The one and only Tycho Brahe saw all those years ago.
Bigjoe
It sure would.
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