The Hot Corona of the Giant YY Mensae with Chandra and XMM-Newton

Details The Hot Corona of the Giant YY Mensae with Chandra and XMM-Newton The Hot Corona of the Giant YY Mensae with Chandra and XMM-Newton

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1202a&link_type=abstract

American Astronomical Society, HEAD meeting #7, #12.02; Bulletin of the American Astronomical Society, Vol. 35, p.616

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Chandra and XMM-Newton high-resolution X-ray spectra of the rapidly rotating giant YY Mensae. It belongs to the class of ``FK Com stars'', i.e. single cool giant stars with projected equatorial velocities measured up to 110 km/s. Chandra and XMM-Newton provide excellent high-resolution X-ray spectra to study the properties of this extreme coronal source. The X-ray spectrum is dominated by a strong continuum component with bright emission lines, mostly from H-like transitions and highly ionized Fe lines (up to Fe XXV), indicative of a very high coronal temperature (≈ 3 keV). The Chandra High-Energy Transmission Grating Spectrometer data are ideal to study at very high resolution this hot coronal source. The Reflection Grating Spectrometer onboard XMM-Newton however provides better information on the cool coronal plasma, and on the carbon and nitrogen abundances. Although no obvious flare was detected in the light curves, YY Men's X-ray luminosity varied by a factor of two between the Chandra and XMM-Newton observations (log LX ≈ 32.16 - 32.42). We derive the coronal emission measure distribution, elemental abundances, and density estimates.
We acknowledge support by SAO grant GO2-3016X.

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