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Observing >> Variable Star Observing and Radio Astronomy

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Reged: 08/24/07

Loc: Unterallgäu, Bavaria, Germany
Chi Cyg near maximum brightness (spectrum) new
      #5853802 - 05/11/13 01:16 PM


it has been quite some time, when I took my last spectra. That night (2013, May 06), I also wanted to test the suitability of my C5 for spectral observations. Combined with an Alan Gee shapley lens it worked quite well and is a nice and compact setup for Staranalyser and video camera (and light weight mount).

The spectra show Chi Cyg near maximum brightness 2013. H-delta and H-gamma emission lines are clearly visible, even in the raw spectrum. This star is a Mira-type variable with the longest period of all Mira-type stars, belonging to type S6. Its strong absorption bands are generated by ZrO, instead of TiO as for Mira-type M-class stars. Refering to Gray/Corbally, Stellar Spectral Classification, Mira-type stars often show H-gamma and H-delta in emission when they reach their maximum brightness.

Link to analysis Chi Cyg:

For comparison, in 2010 I observed Mira itself at its maximum brightness (together with M-class star alp Ceti). Please refer to the following link. The H-emission-lines had been visible too.

Mira spectra:


Edited by HANTO (05/11/13 01:58 PM)

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Carpal Tunnel

Reged: 07/03/10

Re: Chi Cyg near maximum brightness (spectrum) [Re: HANTO]
      #5884029 - 05/25/13 01:56 PM

Interesting investigation!

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