Astron. J., 149, 131 (2015/April-0)
Main-sequence effective temperatures from a revised mass-luminosity relation based on accurate properties.
EKER Z., SOYDUGAN F., SOYDUGAN E., BILIR S., GOKCE E.Y., STEER I., TUYSUZ M., SENYUZ T. and DEMIRCAN O.
Abstract (from CDS):
The mass-luminosity (M-L), mass-radius (M-R), and mass-effective temperature (M-Teff) diagrams for a subset of galactic nearby main-sequence stars with masses and radii accurate to ≤ 3% and luminosities accurate to ≤ 30% (268 stars) has led to a putative discovery. Four distinct mass domains have been identified, which we have tentatively associated with low, intermediate, high, and very high mass main-sequence stars, but which nevertheless are clearly separated by three distinct break points at 1.05, 2.4, and 7 M☉ within the studied mass range of 0.38-32 M☉. Further, a revised mass-luminosity relation (MLR) is found based on linear fits for each of the mass domains identified. The revised, mass-domain based MLRs, which are classical (L ∝ Mα), are shown to be preferable to a single linear, quadratic, or cubic equation representing an alternative MLR. Stellar radius evolution within the main sequence for stars with M > 1 M☉ is clearly evident on the M-R diagram, but it is not clear on the M-Teff diagram based on published temperatures. Effective temperatures can be calculated directly using the well known Stephan-Boltzmann law by employing the accurately known values of M and R with the newly defined MLRs. With the calculated temperatures, stellar temperature evolution within the main sequence for stars with M > 1 M☉ is clearly visible on the M-Teff diagram. Our study asserts that it is now possible to compute the effective temperature of a main-sequence star with an accuracy of ∼6%, as long as its observed radius error is adequately small (<1%) and its observed mass error is reasonably small (<6%).
binaries: eclipsing - binaries: spectroscopic - catalogs - stars: fundamental parameters
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<Available at CDS (J/AJ/149/131): table2.dat table7.dat>
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