Determining the effective temperatures of F-G supergiants from spectroscopic criteria

Details Determining the effective temperatures of F-G supergiants from spectroscopic criteria Determining the effective temperatures of F-G supergiants from spectroscopic criteria

Publishing date

May 1998

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..372k&link_type=abstract

Journals

Astronomy Letters, Volume 24, Issue 3, May 1998, pp.372-376; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 438

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 2

7

Type

Scientific paper

Abstract

The ratio of the depths (equivalent widths) of spectral lines is a good indicator of the effective tem- perature. We derive 23 analytical relations for determining the effective temperatures of F-G supergiants from the depth ratio of lines in the red spectral range. These calibrations are valid for a wide range of surface gravities, microturbulent velocities, and chemical abundances. The effective temperature can be determined with an accuracy higher than 50-80 K by using determinations from several relations. Based on high-resolution CCD spectra, we obtain high-accuracy effective temperatures for six well-studied supergiants. The calibrations are in good agreement with theoretical and empirical temperature scales for F-G supergiants.

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