Study of FK Comae Berenices. V. Spot evolution and detection of surface differential rotation

Details Study of FK Comae Berenices. V. Spot evolution and detection of surface differential rotation Study of FK Comae Berenices. V. Spot evolution and detection of surface differential rotation

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...476..881k&link_type=abstract

Astronomy and Astrophysics, Volume 476, Issue 2, December III 2007, pp.881-891

Astronomy and Astrophysics

Astrophysics

17

Stars: Activity, Stars:, Late-Type, Stars: Starspots, Stars:, Individual: Fk Comae Berenices

Scientific paper

Aims:We investigate the spot evolution and the surface differential rotation of the single late-type giant FK Com. Methods: A total of 18 new surface temperature maps of FK Com are calculated with the Doppler imaging technique for the years 1993-2003. Photometric observations from 2002-2004 are also given. The new and previously published spectroscopic and photometric observations are used to study the spot locations and lifetimes, and to estimate the value of the surface differential rotation. Results: The phases of the active regions determined from the Doppler images follow closely the active longitudes determined earlier from the long-term photometric observations. One active longitude can remain active for several years, but the exact spot configuration within the active longitude changes on much shorter time scales, indicating that the spot lifetime is months instead of years. There are periods during which the spot configuration changes even within days. Measurements using spot latitudes from the Doppler images and spot rotation periods from the photometric observations yield a surface differential rotation law of Ω=(151.30°/day ± 0.09°/day)-(1.78°/day ± 0.12°/{day})sin2ψ and the relative differential rotation coefficient α=0.012± 0.002 for FK Comae.
Based on observations obtained at the Nordic Optical Telescope, Observatorio Roque de los Muchachos, La Palma, Canary Islands, Spain; the Kitt Peak National Observatory, USA; the National Astronomical Observatory, Rozhen, Bulgaria; Automatic Photometric Telescopes Phoenix 10, Wolfgang and Amadeus, Arizona, USA. Tables 2a-c are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/476/881 Figures 2 and 3 are only available in electronic form at http://www.aanda.org

Affiliated with

Also associated with

No associations

Rating

Study of FK Comae Berenices. V. Spot evolution and detection of surface differential rotation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Study of FK Comae Berenices. V. Spot evolution and detection of surface differential rotation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of FK Comae Berenices. V. Spot evolution and detection of surface differential rotation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1473448