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Title:
The surface gravity and mass of Arcturus
Authors:
Ayres, T. R.; Johnson, H. R.
Affiliation:
AA(Harvard College Observatory and Smithsonian Astrophysical Observatory, Cambridge, Mass.), AB(Indiana University, Bloomington, Ind.)
Publication:
Astrophysical Journal, Part 1, vol. 214, June 1, 1977, p. 410-417. (ApJ Homepage)
Publication Date:
06/1977
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
K Stars, Late Stars, Red Giant Stars, Stellar Gravitation, Stellar Mass, Stellar Spectra, Abundance, Atmospheric Models, Calcium, Calibrating, Spectrum Analysis, Stellar Atmospheres, Stellar Evolution, Stellar Models, Stellar Temperature
DOI:
10.1086/155265
Bibliographic Code:
1977ApJ...214..410A

Abstract

The surface gravity of the K giant Arcturus is estimated by comparing synthetic spectra based on model atmospheres with measured wing shapes of the Ca I and Ca II resonance lines calibrated by absolute photometry. The result, log g of approximately 1.6 cm/sec per sec, is consistent with previous spectroscopic estimates based on weak-line ionization ratios, with the exception of a recent determination by Maeckle et al. (1975). A stellar mass of 1.1(+1.7, -0.7) solar masses is obtained for a radius of 27 solar radii. This estimate suggests that Arcturus has not suffered substantial mass loss during its post-main-sequence evolution on the 'ascending red-giant branch'.

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