The angular diameter of R Doradus: a nearby Mira-like star | Zendy

T. R. Bedding | Zendy; A. A. Zijlstra | Zendy; O. von der Lühe | Zendy; J. G. Robertson | Zendy; R. G. Marson | Zendy; J. R. Barton | Zendy; B. S. Carter | Zendy

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The angular diameter of R Doradus: a nearby Mira-like star

Author(s) -

T. R. Bedding,

A. A. Zijlstra,

O. von der Lühe,

J. G. Robertson,

R. G. Marson,

J. R. Barton,

B. S. Carter

Publication year - 1997

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/286.4.957

Subject(s) - physics , astrophysics , radius , luminosity , star (game theory) , amplitude , brightness , angular diameter , astronomy , stars , optics , galaxy , computer security , computer science

We find the angular diameter of R Doradus to be 57 +/- 5 mas, exceeding thatof Betelgeuse and implying that R Dor is larger in apparent size than everystar except the Sun. R Dor is shown to be closely related to the Miravariables. We estimate an effective temperature of 2740 +/- 190 K, a distanceof 61 +/- 7 pc, a luminosity of 6500 +/- 1400 Lsol and a radius of 370 +/- 50Rsol. The characteristics of R Dor are consistent with it being near the edgeof a Mira instability strip. We detect non-zero closure phases from R Dor,indicating an asymmetric brightness distribution. We also observed W Hya, asmall-amplitude Mira, for which we find an angular diameter of 44 +/- 4 mas.Comment: MNRAS (accepted); 7 pages, LaTeX with necessary style file and PostScript figure

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