Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...337..413f&link_type=abstract
Astronomy and Astrophysics, v.337, p.413-420 (1998)
Astronomy and Astrophysics
Astrophysics
8
Stars: Individual: Hd 283572, Stars: Late-Type, Stars: Activity, Stars: Coronae, X-Rays: Stars
Scientific paper
We have analyzed the existing X-ray spectroscopic data for the Weak-Line T Tauri star (WTTS) HD 283572, from the ROSAT, ASCA and SAX satellites. All the data sets are well fit with an absorbed two-temperature model based on collisional ionization equilibrium. Together with the Einstein data discussed in the literature, these data sets afford a 16.5 years time span, allowing to study the short- and long-term spectroscopic and photometric variability characteristics of the X-ray emission from WTT stars. The X-ray luminosity of HD 283572 appears to vary by factors of =~ 2 on time scales of tens of kiloseconds, within a single observations, while its average X-ray luminosity has varied by a factor of =~ 2.5 (peak-to-peak) along the 16.5 yr studied here. The SAX observation also shows evidence for a short flare, with an enhancement of the X-ray luminosity by a factor of =~ 4.
Favata Fabio
Micela Giuseppina
Sciortino Salvatore
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