X - ray rotational modulation of a supersaturated star in IC 2391
نویسندگان
چکیده
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˚modulation implies the presence of structural inhomogeneities. Possible interpretations are presented and discussed.
منابع مشابه
Coronal stripping in supersaturated stars
A recent unambiguous detection of X-ray rotational modulation of the supersaturated star VXR45 (P = 0.223 days) has shown that its corona has discrete dark and bright X-ray regions. We suggest that due to the rapid rotation, the X-ray emitting corona has been centrifugally stripped away, creating open field regions that are dark in X-rays. This leads naturally both to a significant rotational m...
متن کاملMembership , lithium , and metallicity in the young open clusters IC 2602 and IC 2391 : enlarging the sample ⋆ ⋆ ⋆
We present lithium abundances for ∼50 X-ray selected candidate members of the 30–50 Myr old open clusters IC 2602 and IC 2391. These data enlarge and extend to cooler temperatures previous Li surveys of these clusters by Stauffer et al. (1989) and Randich et al. (1997). We also give for the first time an estimate of the metallicity of the two clusters which turns out to be close to solar. Radia...
متن کاملX-ray Emission from Nearby M-dwarfs: the Super-saturation Phenomenon
A rotation rate and X-ray luminosity analysis is presented for rapidly rotating single and binary M-dwarf systems. X-ray luminosities for the majority of both single & binary M-dwarf systems with periods below ≃ 5−6 days (equatorial velocities, Veq∼>6 km s) are consistent with the current rotation-activity paradigm, and appear to saturate at about 10 of the stellar bolometric luminosity. The si...
متن کاملCorrosion Behavior of a Fe-25at%Sn Supersaturated Solid Solution in H3PO4 Solution
Corrosion resistance of iron can be drastically improved by addition of passivating alloying elements. A supersaturated solid solution of Fe-25at%Sn was produced by mechanical alloying of commercially pure iron and tin powders for 24 hours using a planetary ball mill. Electrochemical measurements were performed on cold compacted unsintered specimens.. XRD investigation on produced alloy showed ...
متن کاملThe Sun as an X-ray Star: Active Region Evolution, Rotational Modulation, and Implications for Stellar X-ray Variability
We study the contribution of an active region and its core to the luminosity and the spectrum of the Sun in the X-ray band and to the relevant solar emission measure vs. temperature distribution, EM(T ). We also study the relevant changes in the course of four solar rotations, and the solar rotational modulation due to this active region, the only one present at that time. To this end, we have ...
متن کامل