Chromospheric activity in the Hyades triple system BD + 23 deg 635

Details Chromospheric activity in the Hyades triple system BD + 23 deg 635 Chromospheric activity in the Hyades triple system BD + 23 deg 635

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..457b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, April 1986, p. 457-460.

Astronomy and Astrophysics

Astronomy

1

Binary Stars, Chromosphere, Star Clusters, Stellar Activity, Emission Spectra, H Alpha Line, K Stars, Radial Velocity, Red Shift

Scientific paper

Griffin and Gunn (1981) have shown the Hyades K-dwarf BD + 23 deg 635 to be a triple system, consisting of a single-line spectroscopic binary with a 2.4-day orbital period and a third star at much larger distance. Observations of the red region of BD + 23 deg 635 that were obtained in 1981-82 show H-alpha to be a weak emission feature, exhibiting large velocity shifts with respect to photospheric lines. The spectroscopic primary is identified as the source of the H-alpha emission, implying a high level of chromospheric activity, presumably induced by rapid rotation in the synchronously rotating short-period pair. BD + 23 deg 635 deg appears to show small changes in brightness that are characteristic of BY Draconis stars.

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