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A RADIAL-VELOCITY STUDY OF THE NITROGEN SUPERGIANT HD 105056

NOLAN R. WALBORN, PETER S. CONTI and JEAN-MARIE VREUX
Publications of the Astronomical Society of the Pacific
Vol. 92, No. 547 (June 1980), pp. 284-287
Stable URL: http://www.jstor.org/stable/40677578
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A RADIAL-VELOCITY STUDY OF THE NITROGEN SUPERGIANT HD 105056
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Abstract

An investigation of the radial velocity of the ON supergiant HD 105056 has shown it to be variable with a small range (30-40 km sec⁻¹) and short time scale (a few days), but no satisfactory periodicity has been found in the variations. Evidence is found for a stellar wind of variable magnitude, and there are small absorption-line intensity changes in the spectrum possibly with a very short time scale (≲1 hour). Either the star is not a binary and the variations arise entirely in the stellar wind; or, if it is a binary, it must have a low-mass companion and/or low inclination, and the small-amplitude velocity period is obscured by the combination of measurement errors and stellar wind effects.

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