THE DIFFERENTIAL REDSHIFT OF TITANIUM LINES IN K STARS

THE DIFFERENTIAL REDSHIFT OF TITANIUM LINES IN K STARS

We present measurements of line core positions in UVES spectra of a sample of K-type stars, using the technique of bisector tracing. In all but two of these stars we detect an excess redshift of Ti I lines with respect to Fe I lines. We explain this invoking the temperature-dependence of the line de...

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Veröffentlicht in:Revista mexicana de astronomía y astrofísica 2022-10, Vol.58 (2), p.173-180
Hauptverfasser: Oostra, B., Vargas Muñoz, P. C.
Format: Artikel
Sprache:eng
Schlagworte:
Astronomy & Astrophysics
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Zusammenfassung:We present measurements of line core positions in UVES spectra of a sample of K-type stars, using the technique of bisector tracing. In all but two of these stars we detect an excess redshift of Ti I lines with respect to Fe I lines. We explain this invoking the temperature-dependence of the line depths. We conclude that the granulation curve is not unique but depends on the chemical species.
ISSN:0185-1101
DOI:10.22201/ia.01851101p.2022.58.02.01