The Radial Velocity Variability of alpha Persei: A Low-Amplitude Cepheid outside the Instability Strip?
1995; IOP Publishing; Volume: 452; Linguagem: Inglês
10.1086/176311
ISSN1538-4357
AutoresA. P. Hatzes, William D. Cochran,
Tópico(s)Astronomical Observations and Instrumentation
Resumoview Abstract Citations (14) References (28) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Radial Velocity Variability of alpha Persei: A Low-Amplitude Cepheid outside the Instability Strip? Hatzes, Artie P. ; Cochran, William D. Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1995 DOI: 10.1086/176311 Bibcode: 1995ApJ...452..401H Keywords: STARS: OSCILLATIONS; STARS: INDIVIDUAL CONSTELLATION NAME: ALPHA PERSEI full text sources ADS | data products SIMBAD (3)
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