| Autor: |
J. Davis, M. J. Ireland, J. R. North, J. G. Robertson, W. J. Tango, P. G. Tuthill |
| Zdroj: |
Publications of the Astronomical Society of Australia; 2011, Vol. 28 Issue 1, p58-65, 8p |
| Abstrakt: |
The Sydney University Stellar Interferometer (SUSI) has been used to make a new determination of the angular diameter of Sirius A. The observations were made at an effective wavelength of 694.1nm and the new value for the limb-darkened angular diameter is 6.048±0.040mas (±0.66%). This new result is compared with previous measurements and is found to be in excellent agreement with a conventionally calibrated measurement made with the European Southern Observatory’s Very Large Telescope Interferometer (VLTI) at 2.176μm (but not with a second globally calibrated VLTI measurement). A weighted mean of the SUSI and first VLTI results gives the limb-darkened angular diameter of Sirius A as 6.041±0.017mas (±0.28%). Combination with the Hipparcos parallax gives the radius equal to 1.713±0.009R⊙. The bolometric flux has been determined from published photometry and spectrophotometry and, combined with the angular diameter, yields the emergent flux at the stellar surface equal to (5.32±0.14)×108Wm-2and the effective temperature equal to 9845±64K. The luminosity is 24.7±0.7L⊙. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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