Hα emission in the chromospherically active binary σ_2_ Coronae Borealis (TZ CrB).

Details Hα emission in the chromospherically active binary σ_2_ Coronae Borealis (TZ CrB). Hα emission in the chromospherically active binary σ_2_ Coronae Borealis (TZ CrB).

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..101f&link_type=abstract

Astronomy and Astrophysics, v.320, p.101-108

Astronomy and Astrophysics

Astrophysics

8

Stars: Chromospheres, Stars: Activity, Stars: Binaries: Close, Object: {Sigma_2_ Crb = Tz Crb

Scientific paper

Spectrophotometry of the chromospherically active system σ_2_ Coronae Borealis was obtained in the Hα region, during two observing campaigns at Catania Observatory. During the first campaign, 1988 June 22 - 29, 135 spectra were collected, while 12 spectra were obtained during the second campaign which spanned from June 2nd to June 12th 1989. We have recorded the spectra of the two stars composing the visual binary (σ_1_ and σ_2_ CrB) on the same frame by placing the spectrograph slit along the line connecting the two stars. This enabled us to obtain a light curve in the red band (λ6410-6590Å), using σ_1_ CrB as comparison star. The light curve exhibits changes in the amplitude and in the phase of minimum light between the two observing seasons. The equivalent width of the Hα emission core has been evaluated using the spectrum synthesis method. Hα emission from both components of the inner system is detected in the spectra near quadrature, but it is stronger in the cooler G0 V star. The Hα equivalent width shows low-amplitude modulation in both years which seems to be anti-correlated with the simultaneous light curve. Comparing our results of the 1988 campaign with the contemporaneous X-ray, UV, and Radio measurements reported by Stern et al. (1992ApJ...391..760S) we show that the MgII flux of the cooler component is anti-correlated with our light curve, and a similar behaviour is displayed by the Ly-α flux reported by Hannikainen et al. (1990, ESA SP-310: Evolution in Astrophysics: IUE Astronomy in the Era of New space Missions, p. 387).

Affiliated with

Also associated with

No associations

Rating

Hα emission in the chromospherically active binary σ_2_ Coronae Borealis (TZ CrB). 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 Hα emission in the chromospherically active binary σ_2_ Coronae Borealis (TZ CrB)., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hα emission in the chromospherically active binary σ_2_ Coronae Borealis (TZ CrB). will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1315492