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LX Cygni: Birth of a Carbon star

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#1 ssmith

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Posted 16 July 2020 - 11:04 AM

I was photographing LX Cygni as part of my ongoing carbon star survey and it wasn't until I began processing my photos and doing some research that I learned how unique this star is - it apparently has evolved from an S class star to a C class or Carbon Star from 1975 to 2008.  Over this time span its period of variability rapidly lengthened from 460 days to 588 days which researchers believe coincided with a "Dredging up of Carbon" from its interior to its surface, thus drastically changing its spectral signature. See this paper for a full discussion:   

 

Birth of a Carbon Star

 

Looking at the AAVSO light curves it also appears that its maximum visual magnitude has decreased from 9.0 to ~12.0 which makes it a more challenging object to observe visually.  In my photo I measured its current magnitude at ~14.1 which is near its minimum brightness of ~15.0.  I have also attached the AAVSO Light curve.

 

LX Cyg C9 7-12-20 6fr edit2.jpg

 

LX Cyg Light Curve.jpg


Edited by ssmith, 16 July 2020 - 01:05 PM.

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#2 Rich (RLTYS)

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Posted 17 July 2020 - 02:37 PM

Thanks, an excellent report. It's amazing how much LX has dimmed over the years.


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#3 DHEB

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Posted 20 July 2020 - 12:38 PM

Very interesting! Thank you for the pointer!


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