Journal Article

Supergiant temperatures and linear radii from near-infrared interferometry

G. T. Van Belle, M. J. Creech-Eakman and A. Hart

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 4, pages 1925-1935
Published in print April 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14146.x
Supergiant temperatures and linear radii from near-infrared interferometry

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We present angular diameters for 42 Luminosity Class (LC) I stars and 32 LC II stars that have been interferometrically determined with the Palomar Testbed Interferometer. Derived values of radius and effective temperature are established for these objects, and an empirical calibration of these parameters for supergiants will be presented as a function of spectral type and colours. For the effective temperature versus (VK)0 colour, we find an empirical calibration with a median deviation of ΔT= 70 K in the range of 0.7 < (VK)0 < 5.1 for LC I stars; for LC II, the median deviation is ΔT= 120 K from 0.4 < (VK)0 < 4.3. Effective temperature as a function of spectral type is also calibrated from these data, but shows significantly more scatter than the TEFF versus (VK)0 relationship. No deviation of TEFF versus spectral type is seen for these high-luminosity objects relative to LC II giants. Directly determined diameters range up to 400 R, though are limited by poor distance determinations, which dominate the error estimates. These temperature and radii measures reflect a direct calibration of these parameters for supergiants from empirical means.

Keywords: techniques: interferometric; stars: fundamental parameters; supergiants; infrared: stars

Journal Article.  5962 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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