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A&A 407, L63-L66 (2003)
DOI: 10.1051/0004-6361:20031053

Letter

X-ray rotational modulation of a supersaturated star in IC 2391

A. Marino¹, G. Micela², G. Peres¹ and S. Sciortino<sup>2

1</sup>  Dipartimento di Scienze Fisiche e Astronomiche, Sez. di Astronomia, Università di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
²  INAF - Osservatorio Astronomico di Palermo G.S. Vaiana, Piazza del Parlamento 1, 90134 Palermo, Italy

(Received 7 April 2003 / Accepted 8 July 2003 )

Abstract
We present evidence of X-ray rotational modulation on VXR45, a young fast rotator star, member of IC 2391. It is a dG9 spectral type star whose rotational period and X-ray luminosity make it a supersaturated star. Our X-ray observation, made with EPIC/PN on XMM-Newton, covers about two photometric rotational periods. The detection of  X-ray rotational  modulation implies the presence of structural inhomogeneities. Possible interpretations are presented and discussed.

Key words: open clusters and associations -- stars: individual: IC 2391 -- stars: coronae -- stars: late-type -- stars: rotation -- X-ray: stars

Offprint request: A. Marino, marino@astropa.unipa.it

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© ESO 2003

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