The angular diameter and fundamental parameters of sirius a

J. Davis; M. J. Ireland; J. R. North; J. G. Robertson; W. J. Tango; P. G. Tuthill

doi:10.1071/AS10010

The angular diameter and fundamental parameters of sirius a

J. Davis, M. J. Ireland, J. R. North, J. G. Robertson, W. J. Tango, P. G. Tuthill

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

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 ± 0.040 mas (±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 2.176m (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 1.7130.009R_⊙. 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) × 10 ⁸Wm^-2 and the effective temperature equal to 9845±64K. The luminosity is 24.7±0.7L_⊙.

Original language	English
Pages (from-to)	58-65
Number of pages	8
Journal	Publications of the Astronomical Society of Australia
Volume	28
Issue number	1
DOIs	https://doi.org/10.1071/AS10010
Publication status	Published - 2011
Externally published	Yes

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title = "The angular diameter and fundamental parameters of sirius a",

abstract = "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 ± 0.040 mas (±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 2.176m (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 1.7130.009R⊙. 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) × 10 8Wm-2 and the effective temperature equal to 9845±64K. The luminosity is 24.7±0.7L⊙.",

keywords = "stars: distances, stars: individual (α CMa, HR 2491), techniques: interferometric",

author = "J. Davis and Ireland, {M. J.} and North, {J. R.} and Robertson, {J. G.} and Tango, {W. J.} and Tuthill, {P. G.}",

year = "2011",

doi = "10.1071/AS10010",

language = "English",

volume = "28",

pages = "58--65",

journal = "Publications of the Astronomical Society of Australia",

issn = "1323-3580",

publisher = "Cambridge University Press",

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T1 - The angular diameter and fundamental parameters of sirius a

AU - Davis, J.

AU - Ireland, M. J.

AU - North, J. R.

AU - Robertson, J. G.

AU - Tango, W. J.

AU - Tuthill, P. G.

PY - 2011

Y1 - 2011

N2 - 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 ± 0.040 mas (±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 2.176m (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 1.7130.009R⊙. 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) × 10 8Wm-2 and the effective temperature equal to 9845±64K. The luminosity is 24.7±0.7L⊙.

AB - 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 ± 0.040 mas (±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 2.176m (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 1.7130.009R⊙. 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) × 10 8Wm-2 and the effective temperature equal to 9845±64K. The luminosity is 24.7±0.7L⊙.

KW - stars: distances

KW - stars: individual (α CMa, HR 2491)

KW - techniques: interferometric

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DO - 10.1071/AS10010

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SN - 1323-3580

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SP - 58

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JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

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The angular diameter and fundamental parameters of sirius a

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