Evidence for coronal activity cycles on 61 Cygni A and B

Details Evidence for coronal activity cycles on 61 Cygni A and B Evidence for coronal activity cycles on 61 Cygni A and B

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...406l..39h&link_type=abstract

Astronomy and Astrophysics, v.406, p.L39-L42 (2003)

Astronomy and Astrophysics

Astrophysics

16

Stars: Late-Type, Stars: Activity, Stars: Coronae, Stars: Chromospheres

Scientific paper

We investigate a four-and-one-half year time-series of ROSAT HRI pointed observations of 61 Cyg A and B and compare the X-ray light curves with the chromospheric Ca HK variability. The ROSAT sampling rate was two pointings per year and typical errors lie in the range of 5-10%. The chromospheric cycles are well-known for both stars from the Mt. Wilson Ca HK survey. Although the time basis of our ROSAT observations is shorter than the 7-and 12-year cycles of components A and B, respectively, we find the long-term trend of coronal activity in close correlation with the chromospheric activity during the observation period, between 1993 and 1998. The chromospheric activity increased through maximum activity down to a minimum for component A, and from maximum to minimum activity for component B. The same behaviour is observed for the X-ray light curves but with much higher amplitudes by factors 2.5-3. The remaining scatter observed around low-order regression curves of coronal activity is small. We conclude that both stars do show coronal cycles and that coronal cycles are the dominant source of variability for 61 Cygni.

Affiliated with

Also associated with

No associations

Rating

Evidence for coronal activity cycles on 61 Cygni A and B 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 Evidence for coronal activity cycles on 61 Cygni A and B, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for coronal activity cycles on 61 Cygni A and B will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1462425