The measurement of precise radial velocities of early type stars

Journal Article · Mon Apr 01 04:00:00 EST 1991 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115782· OSTI ID:5638519

Morse, J A; Mathieu, R D; Levine, S E ^[1]

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1. North Carolina Univ., Chapel Hill (USA) Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA) Wisconsin Univ., Madison (USA)

Methods are discussed which have made it possible to measure radial velocities to within 1-3 km/s for O, B, and A spectral-type stars of all v sin i. The methods are based on the premise that neither the spectral type nor the rotation velocity of a star need be well known prior to the velocity measurement. This makes them particularly suitable for survey studies or programs dealing with very heterogeneous samples of early stars. Observations of early type members of the Pleiades and Alpha Persei open clusters at 3787 A shown that the radial-velocity zero point used here for the early type stars is consistent with that for late-type stars to about 1 km/s for all spectral types and projected rotation velocities. 25 refs.

• OSTI ID: 5638519
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 101; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGE-COUPLED DEVICES
MEASURING METHODS
MOTION
RADIAL VELOCITY
ROTATION
SEMICONDUCTOR DEVICES
SPECTROPHOTOMETRY
STAR CLUSTERS
STARS
VELOCITY