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23 April 2024 |
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X-ray spectral and timing characteristics of the stars in the young open cluster IC 2391 | | A. Marino
; G. Micela
; G. Peres
; I. Pillitteri
; S. Sciortino
; | | Date: |
5 Oct 2004 | | Subject: | astro-ph | | Affiliation: | 1,2), G. Micela , G. Peres , I. Pillitteri , S. Sciortino ( Dipartimento di Scienze Fisiche & Astronomiche, Sezione di Astronomia, Universita` di Palermo, Palermo, Italy INAF - Osservatorio Astronomico di Palermo, Palermo, Italy | | Abstract: | We present X-ray spectral and timing analysis of members of the young open cluster IC 2391 observed with the XMM-Newton observatory. We detected 99 X-ray sources by analysing the summed data obtained from MOS1, MOS2 and pn detectors of the EPIC camera; 24 of them are members, or probable members, of the cluster. Stars of all spectral types have been detected, from the early-types to the late-M dwarfs. Despite the capability of the instrument to recognize up to 3 thermal components, the X-ray spectra of the G, K and M members of the cluster are well described with two thermal components (at kT$_1 sim$ 0.3-0.5 keV and kT$_2 sim$ 1.0-1.2 keV respectively) while the X-ray spectra of F members require only a softer 1-T model. The Kolmogorov-Smirnov test applied to the X-ray photon time series shows that approximately 46% of the members of IC 2391 are variable with a confidence level $>$99%. The comparison of our data with those obtained with ROSAT/PSPC, nine years earlier, and ROSAT/HRI, seven years earlier, shows that there is no evidence of significant variability on these time scales, suggesting that long-term variations due to activity cycles similar to that on the Sun are not common, if present at all, among these young stars. | | Source: | arXiv, astro-ph/0410099 | | Other source: | [GID 1083992] astro-ph/0410099 | | Services: | Forum | Review | PDF | Favorites | |
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