First light measurements with the XMM-Newton reflection grating spectrometers: Evidence for an inverse first ionisation potential effect and anomalous Ne abundance in the Coronae of HR 1099

By A. Brinkman, E. Behar, M. Güdel, M. Audard, A. Boggende, G. Branduardi‐Raymont, J. Cottam, C. Erd, J. Herder, F. Jansen and 7 more. 2000

152 citations recorded by the source corpus.

The RS CVn binary system HR 1099 was extensively observed by the XMM-Newton observatory in February 2000 as its first-light target. A total of 570 ks of exposure time was accumulated with the Reflection Grating Spectrometers (RGS). The integrated X-ray spectrum between 5-38A is of unprecedented quality and shows numerous features attributed to transitions of the elements C, N, O, Ne, Mg, Si, S, Fe. Ni, and probably others. We perform an in-depth study of the elemental composition of the average corona of this system, and find that the elemental abundances strongly depend on the first ionisation potential (FIP) of the elements. But different from the solar coronal case, we find an inverse FIP effect, i.e., the abundances (relative to oxygen) increase with increasing FIP. Possible scenarios, e.g., selective enrichment due to Ne-rich flare-like events, are discussed.

Subfields: Astronomy and Astrophysics

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Citations in the corpus

The Sun in Time: Activity and Environment (2007, background): “Early observations of the extremely active subgiant HR 1099 (Brinkman et al., 2001) and the MS K-type ZAMS star AB Dor (Güdel et al., 2001) with the XMM-Newton Reflection Grating Spectrometer uncovered a new, systematic FIP-related bias in magnetically active stars: in contrast to the solar case,…”
Stellar Activity on the Young Suns of Orion: COUP Observations of K5-7 Pre-Main-Sequence Stars (2005, background): “This may be a poor assumption as abundance anomalies and temporal variations have been seen in other magnetically active stars (e.g., Favata & Schmitt 1999; Brinkman et al. 2001) and are present in some COUP sources (G05).”
Evidence for Accretion: High-Resolution X-Ray Spectroscopy of the Classical T Tauri Star TW Hydrae (2001, background): “Evidence for such time-dependent abundance anomalies has been noted for certain late-type stars (e.g., Tsuboi et al. 1998; Brinkman et al. 2001; Audard et al. 2001; see also discussion in Feigelson 2001).”
A Unified Picture of the First Ionization Potential and Inverse First Ionization Potential Effects (2004, background): “…data from XMM-Newton andChandra, the elemental abundance anomalies in active stellar coronae were revealed to be more akin to an inverse FIP effect (Brinkman et al. 2001; Drake et al. 2001), in that while high-FIP elements are essentially unchanged relative to H, low-FIP elements are now depleted…”
Magnetic Flaring in the Pre-Main-Sequence Sun and Implications for the Early Solar System (2002, background): “…consistent with the 105 enhancement over 1 Myr that we infer from 6 The overabundance of neon seen in the X-ray spectra of powerful stellar flares (Brinkman et al. 2001; Güdel et al. 2002) and the association of neon with helium abundances in solar energetic particles (Dwyer et al. 2001) support…”
10 MK Gas in M17 and the Rosette Nebula: X-Ray Flows in Galactic H II Regions (2003, background): “Excess NeIX and NeX lines are prominent in the spectra of nearby flaring late-type stars (Brinkman et al. 2001) and can be presentin pre-main sequence flaring stars as well.”
X-Ray-emitting Young Stars in the Orion Nebula (2002, methodology): “For example, recent spectral studies of flares in magnetically active stars in the solar neighborhood using the XMM-Newton satellite show dramatic variations in neon and iron abundances on timescales of hours during magnetic flares (Brinkman et al. 2001; Güdel et al. 2001; Drake et al. 2001).”