A Spectral-line Analysis of the G8 III Standard ε VIR

Eleven seasons of spectroscopic data comprised of 107 exposures for the stable G8 III standard star, ε Vir are analyzed for projected rotation rate and granulation parameters. A Fourier analysis of the line shapes yield v sin i = 3.06 ± 0.20 km s⁻¹ and a radial-tangential macroturbulence dispersion ζ _RT = 5.16 ± 0.08 km s⁻¹. The radial velocity over nine seasons is constant to 18 m s⁻¹. The absolute radial velocity with granulation blueshifts (but not gravitational redshift) removed is −14120 ± 75 m s⁻¹. Line-depth ratios show the temperature to be constant to 0.7 K over 11 years, although a small secular rise or cyclic variation ∼1 K cannot be ruled out. The third-signature plot shows that the star has granulation velocities 10% larger than the Sun's. Mapping the Fe i λ 6253 line bisector on to the third-signature plot indicates a normal-for-giants flux deficit area of 12.8%, indicating ∼134 K temperature difference between granules and lanes. Deficit velocities of GK giants are seen to shift to higher values with higher luminosity, ∼0.75 km s⁻¹ over Δ M _V ∼ 1.5, indicating larger velocity differences between granules and lanes for giants higher in the HR diagram.