PW And: a Young, Single, Spotted, and Flare K2-Dwarf
Abstract
The single K2 dwarf PW And (HD 1405) has been studied using high resolution echelle spectra taken during eight observing runs from 1999 to 2002. Accurate radial velocity and rotational velocity have been determined by cross correlation with standards stars. The U V W velocity components and the age of 30-80 Myr estimated by using the color magnitude diagram and the LiI line confirm its membership to the young Local Association moving group. We have analysed the photospheric activity (starspots) studying the changes in the bisector of the peak of the cross correlation function (CCF) which are related to changes in the profile of the photospheric lines. The variations of the radial velocity up to 2 km/s that we have found are related with the variations in the CCF bisectors. The chromospheric activity has been analyzed by applying the spectral subtraction technique to the Halpha Hbeta NaI D1&D2 HeI D3 MgIb triplet CaII H&K and CaII IRT lines. Two flares was detected during the 2001 and 2002 observing runs. Variations in the activity seem to be related to the photospheric ones showing a good correlation between radial velocity changes in the CCF bisector and equivalent width of different lines.
- Publication:
-
Stars as Suns : Activity, Evolution and Planets
- Pub Date:
- January 2004
- Bibcode:
- 2004IAUS..219..915M