The Radial Velocity Variability of alpha Persei: A Low-Amplitude Cepheid outside the Instability Strip?

Details The Radial Velocity Variability of alpha Persei: A Low-Amplitude Cepheid outside the Instability Strip? The Radial Velocity Variability of alpha Persei: A Low-Amplitude Cepheid outside the Instability Strip?

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452..401h&link_type=abstract

Astrophysical Journal v.452, p.401

Astronomy and Astrophysics

Astronomy

10

Stars: Oscillations, Stars: Individual Constellation Name: Alpha Persei

Scientific paper

Precise radial velocity measurements (σ ˜ 35 m s-1) are presented for the F5 supergiant alpha Per. Low-amplitude variations with a 2K amplitude of 300 m s-1 and a period of 87.7 days, or a possible (but less likely) period of 9.80 days, are detected. The favored period of 87.7 days most likely arises from rotational modulation by surface features or nonradial pulsations. If the radial velocity variations of α Per result from pulsations, then this star may represent a case for Cepheid-like pulsations in a star just outside of the known boundary of the Cepheid instability strip.

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