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- W101932071 abstract "We present preliminary observational evidences on the variation of the activity level in late type stars, during the evolutionary phases on the main sequence and beyond. We have selected a sample of 51 stars (Fig. 1), lying mostly along evolutionary tracks between 1.3 and 1.7 solar masses, which have been observed in soft X-rays with the Einstein Observatory, and in UV with IUE (Maggio et al. 1990; Haisch et al .1990). Two ROSAT targets, and four new IUE observations are also included. We find that the radiative emission from the outer atmospheres of stars with M > 1.6 M ⊙ seems to behave differently than for stars with lower mass. On the main sequence, the X-ray luminosity of most stars with B-V < 0.42 (spectral type F3) is relatively low, at L x ~ 3 × 10 28 erg s -1 (Fig. 2). In the early evolutionary phases beyond the main sequence, the X-ray luminosity of the higher mass stars tend to increase sistematically up to ~ 10 30 erg s -1 , while the lower mass stars show an initial moderate increase followed by a drop, at B-V ~ 0.6, below our sensitivity threshold." @default.
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- W101932071 date "1993-01-01" @default.
- W101932071 modified "2023-10-16" @default.
- W101932071 title "Evolution of Stellar Activity in Early Post-Main-Sequence Phases" @default.
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- W101932071 doi "https://doi.org/10.1017/s0252921100018558" @default.
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