The surface gravity and mass of Arcturus

Details The surface gravity and mass of Arcturus The surface gravity and mass of Arcturus

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..410a&link_type=abstract

Astrophysical Journal, Part 1, vol. 214, June 1, 1977, p. 410-417.

Astronomy and Astrophysics

Astrophysics

38

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

Scientific paper

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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