The radius and mass of the subgiant star β Hyi from interferometry and asteroseismology

J. R. North; J. Davis; T. R. Bedding; M. J. Ireland; A. P. Jacob; J. O'Byrne; S. M. Owens; J. G. Robertson; W. J. Tango; P. G. Tuthill

doi:10.1111/j.1745-3933.2007.00355.x

The radius and mass of the subgiant star β Hyi from interferometry and asteroseismology

J. R. North^*, J. Davis, T. R. Bedding, M. J. Ireland, A. P. Jacob, J. O'Byrne, S. M. Owens, J. G. Robertson, W. J. Tango, P. G. Tuthill

^*Corresponding author for this work

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

44 Citations (Scopus)

Abstract

We have used the Sydney University Stellar Interferometer to measure the angular diameter of β Hydri. This star is a nearby G2 subgiant the mean density of which was recently measured with high precision using asteroseismology. We determine the radius and effective temperature of the star to be 1.814 ± 0.017R⊙ (0.9 per cent) and 5872 ± 44 K (0.7 per cent) respectively. By combining the radius with the mean density, as estimated from asteroseismology, we make a direct estimate of the stellar mass. We find a value of 1.07 ± 0.03 M⊙ (2.8 per cent), which agrees with published estimates based on fitting in the Hertzsprung-Russell diagram, but has much higher precision. These results place valuable constraints on theoretical models of β Hyi and its oscillation frequencies.

Original language	English
Pages (from-to)	L80–L83
Number of pages	4
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	380
Issue number	1
DOIs	https://doi.org/10.1111/j.1745-3933.2007.00355.x
Publication status	Published - Sept 2007
Externally published	Yes

Keywords

Stars: fundamental parameters
Stars: individual: β hyi
Techniques: interferometric

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10.1111/j.1745-3933.2007.00355.x

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North, J. R., Davis, J., Bedding, T. R., Ireland, M. J., Jacob, A. P., O'Byrne, J., Owens, S. M., Robertson, J. G., Tango, W. J., & Tuthill, P. G. (2007). The radius and mass of the subgiant star β Hyi from interferometry and asteroseismology. Monthly Notices of the Royal Astronomical Society: Letters, 380(1), L80–L83. https://doi.org/10.1111/j.1745-3933.2007.00355.x

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title = "The radius and mass of the subgiant star β Hyi from interferometry and asteroseismology",

abstract = "We have used the Sydney University Stellar Interferometer to measure the angular diameter of β Hydri. This star is a nearby G2 subgiant the mean density of which was recently measured with high precision using asteroseismology. We determine the radius and effective temperature of the star to be 1.814 ± 0.017R⊙ (0.9 per cent) and 5872 ± 44 K (0.7 per cent) respectively. By combining the radius with the mean density, as estimated from asteroseismology, we make a direct estimate of the stellar mass. We find a value of 1.07 ± 0.03 M⊙ (2.8 per cent), which agrees with published estimates based on fitting in the Hertzsprung-Russell diagram, but has much higher precision. These results place valuable constraints on theoretical models of β Hyi and its oscillation frequencies.",

keywords = "Stars: fundamental parameters, Stars: individual: β hyi, Techniques: interferometric",

author = "North, {J. R.} and J. Davis and Bedding, {T. R.} and Ireland, {M. J.} and Jacob, {A. P.} and J. O'Byrne and Owens, {S. M.} and Robertson, {J. G.} and Tango, {W. J.} and Tuthill, {P. G.}",

year = "2007",

month = sep,

doi = "10.1111/j.1745-3933.2007.00355.x",

language = "English",

volume = "380",

pages = "L80–L83",

journal = "Monthly Notices of the Royal Astronomical Society: Letters",

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T1 - The radius and mass of the subgiant star β Hyi from interferometry and asteroseismology

AU - North, J. R.

AU - Davis, J.

AU - Bedding, T. R.

AU - Ireland, M. J.

AU - Jacob, A. P.

AU - O'Byrne, J.

AU - Owens, S. M.

AU - Robertson, J. G.

AU - Tango, W. J.

AU - Tuthill, P. G.

PY - 2007/9

Y1 - 2007/9

N2 - We have used the Sydney University Stellar Interferometer to measure the angular diameter of β Hydri. This star is a nearby G2 subgiant the mean density of which was recently measured with high precision using asteroseismology. We determine the radius and effective temperature of the star to be 1.814 ± 0.017R⊙ (0.9 per cent) and 5872 ± 44 K (0.7 per cent) respectively. By combining the radius with the mean density, as estimated from asteroseismology, we make a direct estimate of the stellar mass. We find a value of 1.07 ± 0.03 M⊙ (2.8 per cent), which agrees with published estimates based on fitting in the Hertzsprung-Russell diagram, but has much higher precision. These results place valuable constraints on theoretical models of β Hyi and its oscillation frequencies.

AB - We have used the Sydney University Stellar Interferometer to measure the angular diameter of β Hydri. This star is a nearby G2 subgiant the mean density of which was recently measured with high precision using asteroseismology. We determine the radius and effective temperature of the star to be 1.814 ± 0.017R⊙ (0.9 per cent) and 5872 ± 44 K (0.7 per cent) respectively. By combining the radius with the mean density, as estimated from asteroseismology, we make a direct estimate of the stellar mass. We find a value of 1.07 ± 0.03 M⊙ (2.8 per cent), which agrees with published estimates based on fitting in the Hertzsprung-Russell diagram, but has much higher precision. These results place valuable constraints on theoretical models of β Hyi and its oscillation frequencies.

KW - Stars: fundamental parameters

KW - Stars: individual: β hyi

KW - Techniques: interferometric

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DO - 10.1111/j.1745-3933.2007.00355.x

M3 - Letter

AN - SCOPUS:52249106011

SN - 1745-3933

VL - 380

SP - L80–L83

JO - Monthly Notices of the Royal Astronomical Society: Letters

JF - Monthly Notices of the Royal Astronomical Society: Letters

IS - 1

ER -

The radius and mass of the subgiant star β Hyi from interferometry and asteroseismology

Abstract

Keywords

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