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Hello All,
Over the last several years I have made scattered
observations of the SR variable T CMa. This star is plotted on VSS RASNZ
charts 987/988 for VY CMa and has a catalogue range of 9.5 to 11 and period 309
days but no spectrum indicated. My observations have shown little
variation, ranging between 11.2 and 12.0.
Intrigued by a lack of variation in my
observations, I recently checked both the vsnet and AAVSO light curves for T CMa
and was surprised to find it being recorded by other observers mostly between
magnitudes 9 and 9.5.
A check of the AAVSO chart for VY CMa shows T CMa
plotted but this chart does not plot a magnitude 9.2 field
star 2 arcmin SW of the variable. This
chart is probably not intended for observing T CMa and I suspect the
observations in both the vsnet and the AAVSO refer to the field star and not T
CMa.
If my suspicians are correct, this still
leaves a question over the true variations of T CMa.
Regards
Peter Williams
Heathcote NSW
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Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
