Portal de Periódicos da CAPES

GINGA observations of X-ray flares on Algol

1992; IOP Publishing; Volume: 400; Linguagem: Inglês

10.1086/171998

1538-4357

Robert A. Stern, Yutaka Uchida, S. Tsuneta, F. Nagase,

Astronomical Observations and Instrumentation

view Abstract Citations (69) References (43) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS GINGA Observations of X-Ray Flares on Algol Stern, R. A. ; Uchida, Y. ; Tsuneta, S. ; Nagase, F. Abstract The Ginga X-ray satellite observed Algol (Beta Per) for 2 days in 1989 January, including both the primary optical eclipse and most of the secondary eclipse. We derive upper limits of about 20 and 10 percent, respectively, for the eclipsed flux fraction during the two eclipses. A large flare lasting over 12 hr was seen prior to and during secondary eclipse. High-temperature Fe line emission is clearly detected in the proportional counter data. The Fe line equivalent width is variable during the flare, ranging from 0.4-1.0 keV. Except for two intervals during the flare rise, the observed equivalent width is lower than predicted using solar abundances and an optically thin plasma model. Similar behavior has also been observed by Ginga in a large flare on UX Ari: in both events, opacity effects at line center may be playing a significant role. Loop model analysis of the large flare suggests that it involves a substantially longer loop or loops than a shorter duration Algol flare seen with Exosat. Publication: The Astrophysical Journal Pub Date: November 1992 DOI: 10.1086/171998 Bibcode: 1992ApJ...400..321S Keywords: Eclipsing Binary Stars; Satellite Observation; Spaceborne Astronomy; Stellar Flares; X Ray Stars; Ginga Satellite; High Temperature Plasmas; Stellar Mass Ejection; X Ray Binaries; Astrophysics; STARS: BINARIES: ECLIPSING; STARS: CORONAE; STARS: INDIVIDUAL CONSTELLATION NAME: BETA PERSEI; X-RAYS: STARS full text sources ADS | data products SIMBAD (5)