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[nova] T Pyx : optical spectrum in the rising phase !

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We obtained optical spectra of T Pyx on Apr. 14.478 UT according to reports of the discovery of the new outbrust ("AAVSO Alert Notics 436" and "vsnet-alert"). T Pyx is a recurrent nova. In the 1966 outburst, the object reached ~6mag in visual bands.  The object brighteness is about 11.5 mag when we observed it tonight. Our preliminary spectrum is shown in the figure. The spectrum shows strong balmer (H-alpha, H-beta), He II, N III, and atomic carbon lines. These features are unique.  In ordinary novae or recurrent novae, they show P-Cygni absorption features for the balmer and He or FeII, and other emissions in its early phase of the outburst. But, T Pyx showed no significant P-Cygni absorptions. These features may be due to the remnant gas surrounding T Pyx with a underdeveloped pseudo-photosphere during the very early stage of the explosion.  We continue observations of the object.

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