Complex Velocity Fields in the Shell of T Pyxidis

Details Complex Velocity Fields in the Shell of T Pyxidis Complex Velocity Fields in the Shell of T Pyxidis

1998-02-13

arxiv.org/abs/astro-ph/9802170v1

Astrophys.J. 498 (1998) L61

Astronomy and Astrophysics

Astrophysics

8 pages including 2 figures; Accepted for publication in The Astrophysical Journal Letters

Scientific paper

10.1086/311310

We present spatially-resolved, moderate-resolution spectrophotometry of the recurrent nova T Pyx and a portion of the surrounding shell. The spectrum extracted from a strip of width 10'' centered on the star shows well-known, strong emission lines typical of old novae, plus a prominent, unfamiliar emission line at 6590 Angstroms. This line, and a weaker companion at 6540 Angstroms which we also detect, have been previously reported by Shahbaz et al., and attributed to Doppler-shifted H alpha emission from a collimated jet emerging from T Pyx. We demonstrate that these lines are instead due to [NII] 6548, 6584 from a complex velocity field in the surrounding nebula. The comments of past workers concerning the great strength of HeII 4686 in T Pyx itself are also reiterated.

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