Determination of stellar shape in microlensing event MOA 2002-BLG-33

N. J. Rattenbury; F. Abe; D. P. Bennett; I. A. Bond; J. J. Calitz; A. Ciaret; K. H. Cook; Y. Furuta; A. Gal-Yam; J. F. Glicenstein; J. B. Hearnshaw; P. H. Hauschildt; P. M. Kilmartin; Y. Kurata; K. Masuda; D. Maoz; Y. Matsubara; P. J. Meintjes; M. Moniez; Y. Muraki; S. Noda; E. O. Ofek; K. Okajima; L. Philpott; S. H. Rhie; T. Sako; D. J. Sullivan; T. Sumi; D. M. Terndrup; P. J. Tristram; J. Wood; T. Yanagisawa; P. C.M. Yock

doi:10.1051/0004-6361:20052858

Determination of stellar shape in microlensing event MOA 2002-BLG-33

N. J. Rattenbury^*, F. Abe, D. P. Bennett, I. A. Bond, J. J. Calitz, A. Ciaret, K. H. Cook, Y. Furuta, A. Gal-Yam, J. F. Glicenstein, J. B. Hearnshaw, P. H. Hauschildt, P. M. Kilmartin, Y. Kurata, K. Masuda, D. Maoz, Y. Matsubara, P. J. Meintjes, M. Moniez, Y. MurakiS. Noda, E. O. Ofek, K. Okajima, L. Philpott, S. H. Rhie, T. Sako, D. J. Sullivan, T. Sumi, D. M. Terndrup, P. J. Tristram, J. Wood, T. Yanagisawa, P. C.M. Yock

^*Corresponding author for this work

School of Physics and Astronomy

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Abstract

We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the source star. At this time, the source star was closely bounded on all sides by a caustic of the lens. This allowed the oblateness of the source star to be constrained. We found that a/b = 1.02 _-0.02 ^+0.04 where a and b are its semi-major and semi-minor axes respectively. The angular resolution of this measurement is approximately 0.04 μarcsec. We also report HST images of the event that confirm a previous identification of the source star as an F8-G2 turn-off main-sequence star.

Original language	English
Pages (from-to)	645-650
Number of pages	6
Journal	Astronomy and Astrophysics
Volume	439
Issue number	2
DOIs	https://doi.org/10.1051/0004-6361:20052858
State	Published - Aug 2005

Keywords

Gravitational lensing
Stars: atmospheres
Stars: rotation

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10.1051/0004-6361:20052858

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Rattenbury, N. J., Abe, F., Bennett, D. P., Bond, I. A., Calitz, J. J., Ciaret, A., Cook, K. H., Furuta, Y., Gal-Yam, A., Glicenstein, J. F., Hearnshaw, J. B., Hauschildt, P. H., Kilmartin, P. M., Kurata, Y., Masuda, K., Maoz, D., Matsubara, Y., Meintjes, P. J., Moniez, M., ... Yock, P. C. M. (2005). Determination of stellar shape in microlensing event MOA 2002-BLG-33. Astronomy and Astrophysics, 439(2), 645-650. https://doi.org/10.1051/0004-6361:20052858

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title = "Determination of stellar shape in microlensing event MOA 2002-BLG-33",

abstract = "We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the source star. At this time, the source star was closely bounded on all sides by a caustic of the lens. This allowed the oblateness of the source star to be constrained. We found that a/b = 1.02 -0.02 +0.04 where a and b are its semi-major and semi-minor axes respectively. The angular resolution of this measurement is approximately 0.04 μarcsec. We also report HST images of the event that confirm a previous identification of the source star as an F8-G2 turn-off main-sequence star.",

keywords = "Gravitational lensing, Stars: atmospheres, Stars: rotation",

author = "Rattenbury, {N. J.} and F. Abe and Bennett, {D. P.} and Bond, {I. A.} and Calitz, {J. J.} and A. Ciaret and Cook, {K. H.} and Y. Furuta and A. Gal-Yam and Glicenstein, {J. F.} and Hearnshaw, {J. B.} and Hauschildt, {P. H.} and Kilmartin, {P. M.} and Y. Kurata and K. Masuda and D. Maoz and Y. Matsubara and Meintjes, {P. J.} and M. Moniez and Y. Muraki and S. Noda and Ofek, {E. O.} and K. Okajima and L. Philpott and Rhie, {S. H.} and T. Sako and Sullivan, {D. J.} and T. Sumi and Terndrup, {D. M.} and Tristram, {P. J.} and J. Wood and T. Yanagisawa and Yock, {P. C.M.}",

year = "2005",

month = aug,

doi = "10.1051/0004-6361:20052858",

language = "אנגלית",

volume = "439",

pages = "645--650",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

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Rattenbury, NJ, Abe, F, Bennett, DP, Bond, IA, Calitz, JJ, Ciaret, A, Cook, KH, Furuta, Y, Gal-Yam, A, Glicenstein, JF, Hearnshaw, JB, Hauschildt, PH, Kilmartin, PM, Kurata, Y, Masuda, K, Maoz, D, Matsubara, Y, Meintjes, PJ, Moniez, M, Muraki, Y, Noda, S, Ofek, EO, Okajima, K, Philpott, L, Rhie, SH, Sako, T, Sullivan, DJ, Sumi, T, Terndrup, DM, Tristram, PJ, Wood, J, Yanagisawa, T & Yock, PCM 2005, 'Determination of stellar shape in microlensing event MOA 2002-BLG-33', Astronomy and Astrophysics, vol. 439, no. 2, pp. 645-650. https://doi.org/10.1051/0004-6361:20052858

TY - JOUR

T1 - Determination of stellar shape in microlensing event MOA 2002-BLG-33

AU - Rattenbury, N. J.

AU - Abe, F.

AU - Bennett, D. P.

AU - Bond, I. A.

AU - Calitz, J. J.

AU - Ciaret, A.

AU - Cook, K. H.

AU - Furuta, Y.

AU - Gal-Yam, A.

AU - Glicenstein, J. F.

AU - Hearnshaw, J. B.

AU - Hauschildt, P. H.

AU - Kilmartin, P. M.

AU - Kurata, Y.

AU - Masuda, K.

AU - Maoz, D.

AU - Matsubara, Y.

AU - Meintjes, P. J.

AU - Moniez, M.

AU - Muraki, Y.

AU - Noda, S.

AU - Ofek, E. O.

AU - Okajima, K.

AU - Philpott, L.

AU - Rhie, S. H.

AU - Sako, T.

AU - Sullivan, D. J.

AU - Sumi, T.

AU - Terndrup, D. M.

AU - Tristram, P. J.

AU - Wood, J.

AU - Yanagisawa, T.

AU - Yock, P. C.M.

PY - 2005/8

Y1 - 2005/8

N2 - We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the source star. At this time, the source star was closely bounded on all sides by a caustic of the lens. This allowed the oblateness of the source star to be constrained. We found that a/b = 1.02 -0.02 +0.04 where a and b are its semi-major and semi-minor axes respectively. The angular resolution of this measurement is approximately 0.04 μarcsec. We also report HST images of the event that confirm a previous identification of the source star as an F8-G2 turn-off main-sequence star.

AB - We report a measurement of the shape of the source star in microlensing event MOA 2002-BLG-33. The lens for this event was a close binary whose centre-of-mass passed almost directly in front of the source star. At this time, the source star was closely bounded on all sides by a caustic of the lens. This allowed the oblateness of the source star to be constrained. We found that a/b = 1.02 -0.02 +0.04 where a and b are its semi-major and semi-minor axes respectively. The angular resolution of this measurement is approximately 0.04 μarcsec. We also report HST images of the event that confirm a previous identification of the source star as an F8-G2 turn-off main-sequence star.

KW - Gravitational lensing

KW - Stars: atmospheres

KW - Stars: rotation

UR - http://www.scopus.com/inward/record.url?scp=23944465724&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20052858

DO - 10.1051/0004-6361:20052858

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AN - SCOPUS:23944465724

SN - 0004-6361

VL - 439

SP - 645

EP - 650

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

IS - 2

ER -

Determination of stellar shape in microlensing event MOA 2002-BLG-33

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