========================================================================== J/A+A/478/507 Effect of activity on stellar temp. and radii (Morales+, 2008) The following files can be converted to FITS (extension .fit .fgz or .fiZ) table?.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/A+A/478/507 ==========================================================================
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Beginning of ReadMe : J/A+A/478/507 Distances and atmospheric parameters of MSU stars (Morales+, 2008) ================================================================================ The effect of activity on stellar temperatures and radii. Morales J.C., Ribas I., Jordi C. <Astron. Astrophys. 478, 507 (2008)> =2008A&A...478..507M ================================================================================ ADC_Keywords: Binaries, eclipsing ; Stars, late-type; Effective temperatures ; Magnitudes Keywords: stars: activity - stars: fundamental parameters - stars: late-type - stars: binaries: eclipsing Abstract: Recent analyses of low-mass eclipsing binary stars have unveiled a significant disagreement between the observations and the predictions of stellar structure models. Results show that theoretical models underestimate the radii and overestimate the effective temperatures of low-mass stars but yield luminosities that accord with observations. A hypothesis based upon the effects of stellar activity was put forward to explain the discrepancies. Here we study the existence of the same trend in single active stars and provide a consistent scenario to explain systematic differences between active and inactive stars in the H-R diagram reported earlier. The analysis is done using single field stars of spectral types late-K and M and computing its bolometric magnitudes and temperatures through infrared colours and spectral indices. The properties of the stars in samples of active and inactive stars are compared statistically to reveal systematic differences. After accounting for a number of possible bias effects, active stars are shown to be cooler than inactive stars of similar luminosity therefore implying a larger radius as well, in proportions that are in excellent agreement with those found from eclipsing binaries. The present results generalise the existence of strong radius and temperature dependences on stellar activity to the entire population of low-mass stars, regardless of their membership in close binary systems. Description: These tables list the fundamental properties of 747 stars with trigonometric parallaxes determinations from the Palomar/Michigan State University survey (hereafter PMSU; Reid et al. 1995; Hawley et al. 1996, Cat. III/198). For each of those stars its PMSU number, identifier, distance, TiO5 spectral index, equivalent width of the Halpha line (EW Halpha) if active, K band magnitude and absolute bolometric magnitude are listed. The final remark indicates if the star has been excluded from the sample of single main sequence stars.