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Title:
A detailed X-ray investigation of zeta Puppis. I. The dataset and some preliminary results
Authors:
Nazé, Y.; Flores, C. A.; Rauw, G.
Affiliation:
AA(GAPHE, Département AGO, Université de Liège, Allée du 6 Août 17, Bât. B5C, 4000, Liège, Belgium ; ), AB(Departamento de Astronomia, Universidad de Guanajuato, Apdo Postal 144, Guanajuato, GTO, Mexico), AC(GAPHE, Département AGO, Université de Liège, Allée du 6 Août 17, Bât. B5C, 4000, Liège, Belgium)
Publication:
Astronomy & Astrophysics, Volume 538, id.A22, 9 pp. (A&A Homepage)
Publication Date:
02/2012
Origin:
EDP Sciences
Astronomy Keywords:
X-rays: stars, stars: early-type, stars: individual:zetaPuppis, stars: mass-loss
DOI:
10.1051/0004-6361/201117387
Bibliographic Code:
2012A&A...538A..22N

Abstract


Aims: One of the closest and brightest massive stars, zeta Puppis, was the first early-type object observed by the current generation of X-ray observatories. These observations provided some surprising results, partly confirming the theoretical predictions while simultaneously unveiling some problematic mismatches with expectations. In this series of papers, we perform a thorough study of zeta Puppis in X-rays, using a decade of XMM-Newton observations.
Methods: The star zeta Puppis was observed 18 times by XMM-Newton, totaling 1 Ms in exposure. This provides the highest quality high-resolution X-ray spectrum of a massive star to date, as well as a perfect dataset for studying X-ray variability in an "archetype" object.
Results: This first paper reports on the data reduction of this unique dataset and provides a few preliminary results. On the one hand, analysis of EPIC low-resolution spectra shows the star to have a remarkably stable X-ray emission from one observation to the next. On the other hand, fitting by a wind model of individual line profiles recorded by RGS confirms the wavelength dependence of the line morphology.

Based on observations collected with XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).Table 1 is available in electronic form at http://www.aanda.org

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