Magnetic activity on 12 Cam and 29 Dra from long-term photometry

Details Magnetic activity on 12 Cam and 29 Dra from long-term photometry Magnetic activity on 12 Cam and 29 Dra from long-term photometry

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009an....330..377z&link_type=abstract

Astronomische Nachrichten, Vol.330, Issue 4, p.377

Astronomy and Astrophysics

Astronomy

3

Stars: Activity, Stars: Individual (12 Cam, 29 Dra), Stars: Late Type, Stars: Magnetic Fields, Starspots, Techniques: Photometric

Scientific paper

We present newly discovered magnetic cycles of two late-type and long-period SB1 systems: 12 Cam and 29 Dra. The long-term photometry study revealed the presence of magnetic multiperiodic cycles on both stars, namely 14.8 and 8.5 yr for 12 Cam and 20.3, 11.1, and 7.6 yr for 29 Dra. Furthermore, the modelling of the V-band light curves revealed the existence of two active longitudes on 12 Cam and probably on 29 Dra as well. Both stars show changes of rotational period. The 12 Cam is the slowest rotating star whose activity cycle has been determined. The activity cycles determined by us allow us to extend to the slower rotation regime and to improve the significance of the empirical relation between rotation period and magnetic cycle length.

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