Sign on

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (84) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (2)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
An analysis of the variable radial velocity of alpha Cygni
Authors:
Lucy, L. B.
Affiliation:
AA(Columbia University, New York, N.Y.)
Publication:
Astrophysical Journal, vol. 206, June 1, 1976, pt. 1, p. 499-508. (ApJ Homepage)
Publication Date:
06/1976
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
A Stars, Radial Velocity, Supergiant Stars, Variable Stars, Binary Stars, Orbital Elements, Photographic Plates, Secular Variations, Stellar Mass Ejection
DOI:
10.1086/154405
Bibliographic Code:
1976ApJ...206..499L

Abstract

On the basis of 447 radial velocities obtained at the Lick Observatory in the years 1927-1935, an attempt is made to discover the nature of the semiregular variability of alpha Cygni. Harmonic analysis of the 144 velocities obtained in 1931 suggests that this variability is due to the simultaneous excitation of many discrete pulsation modes. The amplitudes and periods of these modes are then determined by least-squares obtaining a solution that comprises 16 terms. All terms are found to have highly significant amplitudes, and most terms also pass a test of the stability of their amplitudes and phases. Reasons are given for believing that most terms represent nonradial oscillations, leading to the suggestion that the resulting surface motions are to be identified with macroturbulence. An argument is given for believing that the pulsational instability persists down to periods at which atmospheric oscillations become progressive, possibly giving rise to the observed mass loss.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences



More Article Retrieval Options

HELP for Article Retrieval


Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)

  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints