Abstract
view Abstract Citations (15) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High-Dispersion Classification of K2-M6 Giants of High and Low Velocity Deutsch, A. J. ; Wilson, O. C. ; Keenan, P. C. Abstract The classification of early M-type giants by the usual criteria of TiO band strengths has been tested by estimating ratios of weak atomic lines on coudé spectrograms of scale 9-10 A mm1. No systematic dif- ferences are found between the types given by the two methods for Population I stars and for high- velocity stars of intermediate Population II. Published V - I and U - I colors also give sequences in agreement with the spectral types. Although there is thus no evidence that TiO bands differ in strength between giants of the two popula- tions studied, in several of the M stars of high velocity a slight weakening of the stronger atomic lines ap- pears to be present. In several stars representing both populations, the absorption lines at Hy and Ho show intensity changes on a time scale of weeks or months; but other absorption lines and bands appear not to vary Publication: The Astrophysical Journal Pub Date: April 1969 DOI: 10.1086/149951 Bibcode: 1969ApJ...156..107D full text sources ADS | data products SIMBAD (37)
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