A low-amplitude periodicity in the radial velocity and chromospheric emission of Beta Geminorum

Details A low-amplitude periodicity in the radial velocity and chromospheric emission of Beta Geminorum A low-amplitude periodicity in the radial velocity and chromospheric emission of Beta Geminorum

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..825l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 690, p. 825-831.

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22

Chromosphere, Emission Spectra, Giant Stars, K Stars, Radial Velocity, Stellar Atmospheres, Computational Astrophysics, Least Squares Method, Stellar Magnetic Fields, Stellar Spectrophotometry

Scientific paper

Using high-quality spectra obtained with the hydrogen fluoride technique at the Canada-France-Hawaii 3.6-m telescope and Dominion Astrophysical Observatory 1.22-m telescope, we have detected a low-amplitude periodicity in both the radial velocity and chromospheric emission of Beta Geminorum. In addition, we have detected a long-term change (greater than 12 yr) in this star's chromospheric emission which is reminiscent of solar-type magnetic cycles believed present in giants of similar spectral type. The radial-velocity variations can be fitted by a sinusoid with amplitude and period of K = 46.23 +/- 3.9 m/s, P = 584.65 +/- 3.3 d. A similar, statistically significant (false-alarm probability of 1 percent) period is found in the residuals from the long-term trend in the chromospheric emission: P = 587.7 +/-12 d. However, because of the weakness of the signal, K = 0.583 +/- 0.19 mA, this detection needs confirmation.

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