MUSICOS 1998: Optical and X-rays Observations of Flares on the RS CVn Binary HR 1099
Abstract
We present simultaneous and continuous observations of Halpha, Hbeta, NaI D1, D2 and HeI D3 lines of the chromospherically active binary HR 1099. We have observed HR 1099 for more than 3 weeks almost continuously and monitored two flares. An increase in Halpha, CaII H & K, Hbeta, HeI D3 and HeI lambda6678 and a strong filling-in of the NaI D1, D2 and MgI b triplet during one of the flares are observed. We have found that the flares took place at the same phase (0.85) of the binary orbit, and both of them seems to occur near the limb. Several X-rays flares were also detected by ASM on board RXTE. Rotational modulation in the X-rays light curve has been detected with maximum flux when the active K1IV star is in front.
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