SIMBAD references

2018A&A...616A..68G - Astronomy and Astrophysics, volume 616A, 68-68 (2018/8-1)

Fundamental properties of red-clump stars from long-baseline H-band interferometry.

GALLENNE A., PIETRZYNSKI G., GRACZYK D., NARDETTO N., MERAND A., KERVELLA P., GIEREN W., VILLANOVA S., MENNICKENT R.E. and PILECKI B.

Abstract (from CDS):

Observations of 48 red-clump stars were obtained in the H band with the PIONIER instrument installed at the Very Large Telescope Interferometer. Limb-darkened angular diameters were measured by fitting radial intensity profile I(r) to square visibility measurements. Half the angular diameters determined have formal errors better than 1.2%, while the overall accuracy is better than 2.7%. Average stellar atmospheric parameters (effective temperatures, metallicities and surface gravities) were determined from new spectroscopic observations and literature data and combined with precise Gaia parallaxes to derive a set of fundamental stellar properties. These intrinsic parameters were then fitted to existing isochrone models to infer masses and ages of the stars. The added value from interferometry imposes a better and independent constraint on the R-Teff plane. Our derived values are consistent with previous works, although there is a strong scatter in age between various models. This shows that atmospheric parameters, mainly metallicities and surface gravities, still suffer from a non-accurate determination, limiting constraints on input physics and parameters of stellar evolution models.

Abstract Copyright: © ESO 2018

Journal keyword(s): techniques: interferometric - techniques: high angular resolution - stars: late-type - stars: fundamental parameters

Simbad objects: 159

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2019.12.14-06:10:16

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