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The Observation and Analysis of Stellar Photospheres
- D. F. Gray
- Physics
- 16 December 2021
This textbook describes the equipment, observational techniques, and analysis used in the investigation of stellar photospheres. Now in its fourth edition, the text has been thoroughly updated and…
Measurements of rotation and turbulence in F, G and K dwarfs.
- D. F. Gray
- Physics
- 1 June 1984
The rotational break for G giants
- D. F. Gray
- Physics
- 1 December 1989
New high-resolution spectroscopic observations have been obtained for 73 G giants. Fourier analysis of their spectral lines yields rotation velocities and macroturbulence dispersions. Combined with…
The Star Patch on the G8 Dwarf chi Bootis A
- C. Toner, D. F. Gray
- Physics
- 1 November 1988
Les observations spectroscopiques de cette naine rouge montrent que des variations dans l'asymetrie des raies spectrales et dans les largeurs equivalentes apparaissent periodiquement tous les 6.43…
SPECTRAL LINE-DEPTH RATIOS AS TEMPERATURE INDICATORS FOR COOL STARS
- D. F. Gray
- Physics, Geology
- 1 December 1994
The use of spectral line-depth ratios as a stellar thermometer in G and K dwarfs is developed and refined beyond an earlier study (Gray and Johnson 1991). Ratios incorporating a line with any degree…
ROTATION AND MACROTURBULENCE IN METAL-POOR FIELD RED GIANT AND RED HORIZONTAL BRANCH STARS
- B. Carney, D. F. Gray, J. Laird
- Physics
- 30 November 2007
We report the results for rotational velocities, Vrot sin i, and macroturbulence dispersions, ζRT, for 12 metal-poor field red giant branch (RGB) stars and 7 metal-poor field red horizontal branch…
The Rotation of Arcturus and Active Longitudes on Giant Stars
- D. F. Gray, Kevin I. T. Brown
- Physics
- 7 August 2006
From two decades of high‐resolution spectroscopic measurements of Arcturus (HR 5340, K2 III), we identify a 2 yr modulation in the velocity span of the bisector of the Fe i λ6252.57 line. It seems…
High‐resolution spectroscopic study of red clump stars in the Galaxy: iron‐group elements
- E. Puzeras, G. Tautvaišienė, Y. Chorniy
- Physics
- 19 June 2010
The main atmospheric parameters and abundances of the iron-group elements (vanadium, chromium, iron, cobalt and nickel) are determined for 62 red giant ‘clump’ stars revealed in the Galactic field by…
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