The Radial Velocity Variability of the K Giant beta Ophiuchi. II. Long-Period Variations

Details The Radial Velocity Variability of the K Giant beta Ophiuchi. II. Long-Period Variations The Radial Velocity Variability of the K Giant beta Ophiuchi. II. Long-Period Variations

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...468..391h&link_type=abstract

Astrophysical Journal v.468, p.391

Astronomy and Astrophysics

Astronomy

15

Stars: Individual Constellation Name: Beta Ophiuchi, Stars: Oscillations, Techniques: Radial Velocities

Scientific paper

Precise relative radial velocity measurements (σ ˜ 20 m s-1) of the K giant β Oph are presented and these show variations with a period of 13.05 days. Rotational modulation, low-mass companions, and radial velocity variations can be excluded as an explanation for these variations. Most likely this period results from a nonradial g-mode. A period analysis on the residual radial velocities after subtracting the contribution of the dominant period yields a long-term period of 142.3 days and a short-term period of 0.2589±0.005 days. The latter is consistent with previous works by Hatzes & Cochran. The long-term period, if real, most likely arises from rotational modulation by surface features, although the presence of a planetary companion cannot be excluded at the present time.

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