The extreme ultraviolet and X-ray Sun in Time: High-energy evolutionary tracks of a solar-like star
Abstract
Aims: We aim to describe the pre-main-sequence and main-sequence evolution of X-ray and extreme-ultaviolet radiation of a solar-mass star based on its rotational evolution starting with a realistic range of initial rotation rates.
Methods: We derive evolutionary tracks of X-ray radiation based on a rotational evolution model for solar-mass stars and the rotation-activity relation. We compare these tracks to X-ray luminosity distributions of stars in clusters with different ages.
Results: We find agreement between the evolutionary tracks derived from rotation and the X-ray luminosity distributions from observations. Depending on the initial rotation rate, a star might remain at the X-ray saturation level for very different time periods, from ≈10 Myr to ≈300 Myr for slow and fast rotators, respectively.
Conclusions: Rotational evolution with a spread of initial conditions leads to a particularly wide distribution of possible X-ray luminosities in the age range of 20-500 Myr, before rotational convergence and therefore X-ray luminosity convergence sets in. This age range is crucial for the evolution of young planetary atmospheres and may thus lead to very different planetary evolution histories.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 2015
- DOI:
- 10.1051/0004-6361/201526146
- arXiv:
- arXiv:1504.04546
- Bibcode:
- 2015A&A...577L...3T
- Keywords:
-
- Sun: evolution;
- stars: rotation;
- stars: activity;
- stars: solar-type;
- planets and satellites: atmospheres;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 4 pages, 4 figures, accepted for publication in A&