Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111..913h&link_type=abstract
Astronomical Journal v.111, p.913
Astronomy and Astrophysics
Astronomy
13
Stars: Carbon, Stars: Variables: Mira, Infrared: Stars
Scientific paper
Radial velocities have been measured in a time series of 30 two micron infrared spectra of the bright, carbon-type Mira S Cep. This is the first carbon-rich Mira variable to be examined with time-series, high-resolution, infrared spectroscopy. Velocities were measured by cross correlation of a spectral interval dominated by CN Δv=-2 red-system lines. The velocities sample the motion of the bulk infrared photo sphere and show S Cep to have a typical Mira-type infrared velocity curve with amplitude of 22 km s-1 The velocities of the cores of low-excitation CO Δv=2 lines were also measured. These strong lines show a contribution to the spectrum from material falling into the star well past maximum light. The strong CO lines also have a contribution from material moving away from the star at a few km s-1. The visual spectrum shows typical characteristics of Mira behavior with Hα varying in strength and large differences among atomic line velocities.
Barnbaum Cecilia
Hinkle Kenneth H.
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