Remarks on Bolometric Corrections and Effective Temperatures.

Abstract

view Abstract Citations (69) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Remarks on Bolometric Corrections and Effective Temperatures. Popper, Daniel M. Abstract The usually accepted systems of bolometric corrections and effective temperatures, based essentially on Kuiper's discussion of 20 years ago, are examined in the light of current knowledge. Bolometric corrections for stars cooler than type FO can be improved with the use of photoelectric magnitudes and colors. For hotter stars, improved atmospheric models are available. Photoelectric colors rather than spectral types are used as argument for both bolometric corrections and temperatures. Stars redder than about B - V $ 1.4 mag. are excluded from the discussion. A new fundamental determination of an effective temperature is that of Sirius from its angular diameter by Hanbury Brown and Twiss. The value is about 1000 lower than earlier determinadons and is in agreement with the value from a model-atmosphere investigation of Vega by Hunger. Model-atmosphere computations for 0 and early B stars by various authors lead generally to much higher temperatures than Kuiper adopted. For stars cooler than the sun, the reliability of temperatures based upon interferometer measures of angular diameters is questioned. Moreover, the effective temperature of YY Gem is somewhat uncertain because its bolometric correction has not been measured. Thus, except for the sun, the scale of effective temperatures cannot be considered definitively established for any spectral class. Temperature differences between giants and main-sequence stars of tbe same spectral type are found to be smaller than those usually adopted. Observations for improving the temperature scale are discussed briefly. Publication: The Astrophysical Journal Pub Date: May 1959 DOI: 10.1086/146663 Bibcode: 1959ApJ...129..647P full text sources ADS | data products SIMBAD (25) GCPD (1)