How typical is the Sun's magnetic cycle ?
Abstract
Solar analogs refer to main-sequence stars with 0.8 Msun < mass < 1.2 Msun. Solar twins are stars with Teff, [Fe/H], mass and rotation indistinguishable from the Sun. These solar twins shed a new light on the question of how typical the Sun is within the class of solar-type stars. From the magnetic activity point of view, some previous work has suggested that the Sun's magnetic cycle period Pcyc is unusual compared with similar stars, falling between sequences of active and inactive stars. Combining a sample from HARPS planet-search program with high-precision Ca II H & K chromospheric activity measurements we selected a large number of new reliable Pcyc, and we revisit the relation between rotation periods Prot and Pcyc. Our preliminary analysis shows that the Sun does not has a special position between the active and inactive sequences, but instead follows a new solar-analog-twin sequence proposed here.
- Publication:
-
IAU General Assembly
- Pub Date:
- August 2015
- Bibcode:
- 2015IAUGA..2250017D