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Spectrum of LX CygLX Cygni is a long period variable (or "Mira" star) in the Faint CV and LPV project of the AAVSO's CCD Observing program. Originally entered in the GCVS with a period of about 460 days, the period has increased dramatically since the late 1960s, and now lies between 550 and 600 days. The following spectrum of LX Cyg by Maurice Gavin shows the spectral characteristics of the star during its recent decline from maximum.
A plot of visual and CCD observations of LX Cyg from the Light Curve Generator shows the stars recent period, including the current fade from maximum. Note that the period is much longer than the 465.3 days currently given in the GCVS. Since the period is still changing, more observations will be needed in the years to come to track this evolution. 
Also note the significant difference in the visual and CCDV light curves for this star. Ron Zissell has studied this, and found that it can be explained by two things: the fact that there is a difference between the comparison star magnitudes in visual and V bandpasses, and the fact that the spectral type of this very red star (B-V > +3.0) changes during the course of the pulsation cycle. Ron Zissell's work on this and several other stars will appear in the next issue of the Journal of the AAVSO. |
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