SIMBAD references

2001ApJ...554.1079S - Astrophys. J., 554, 1079-1086 (2001/June-3)

Extreme Ultraviolet Explorer observations of λ Andromedae.


Abstract (from CDS):

Extreme-ultraviolet spectra (70-740 Å) and light curves (75-175 Å) of the spectroscopic binary system λ Andromedae (HD 222107) were obtained with the Extreme Ultraviolet Explorer (EUVE) satellite in 1997 July and August. Two flares were detected during the observations that spanned 15 days, or almost (3)/(4) of the orbital period of 20.5 days, with a total exposure time of 283 ks. The emission measure distribution (EMD) of λ And derived from a line-based analysis shows an increasing slope with temperatures over the range logTe (K)=6.5-7.3 as well as a remarkable narrow enhancement or ``bump'' around logTe (K)=6.9. Both flaring and quiescent EUVE spectra were obtained. During the flares, small changes were detected in both the general slope of the EMD and the height of the bump, but the bump remained very stable in its temperature. Electron densities of logNe (cm–3)∼12.3 are indicated at temperatures of logTe (K)=7 using Fe XXI and Fe XXII emission features, and those densities increase to logNe (cm–3)∼12.9 during flaring episodes.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Spectroscopic - Stars: Coronae - Stars: Flare - Stars: Individual: Constellation Name: λ Andromedae - X-Rays: Stars

Simbad objects: 6

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