High Resolution X-ray Spectroscopy of the Post-T Tauri Star PZ Tel

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dc.creatorArgiroffi, C.
dc.creatorDrake, J. J.
dc.creatorMaggio, A.
dc.creatorPeres, G.
dc.creatorSciortino, S.
dc.creatorHarnden, F. R.
dc.date2004-03-01
dc.date.accessioned2026-07-07T11:42:20Z
dc.date.available2026-07-07T11:42:20Z
dc.descriptionWe present an analysis of the Chandra High Energy Transmission Grating Spectrometer observation of the rapidly rotating P_(rot)=0.94 d post T Tauri (~20 Myr old) star PZ Telescopii, in the Tucana association. Using two different methods we have derived the coronal emission measure distribution, em(T), and chemical abundances. The em(T) peaks at log T = 6.9 and exhibits a significant emission measure at temperatures log T > 7. The coronal abundances are generally ~0.5 times the solar photospheric values that are presumed fairly representative of the composition of the underlying star. A minimum in abundance is seen at a first ionization potential (FIP) of 7-8 eV, with evidence for higher abundances at both lower and higher FIP, similar to patterns seen in other active stars. From an analysis of the He-like triplet of Mg XI we have estimated electron densities of ~10^(12)-10^(13) cm^(-3). All the coronal properties found for PZ Tel are much more similar to those of AB Dor, which is slightly older than PZ Tel, than to those of the younger T Tauri star TW Hya. These results support earlier conclusions that the soft X-ray emission of TW Hya is likely dominated by accretion activity rather than by a magnetically-heated corona. Our results also suggest that the coronae of pre-main sequence stars rapidly become similar to those of older active main-sequence stars soon after the accretion stage has ended.
dc.description15 pages, 8 Postscript figures, accepted for publication in Astrophysical Journal
dc.identifierhttps://arxiv.org/abs/astro-ph/0403017
dc.identifierhttp://arxiv.org/abs/astro-ph/0403017
dc.identifierAstrophys.J.609:925-934,2004
dc.identifierdoi:10.1086/420692
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200853
dc.subjectAstrophysics
dc.titleHigh Resolution X-ray Spectroscopy of the Post-T Tauri Star PZ Tel
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