A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring

C. Alcock; R. A. Allsman; D. R. Alves; T. S. Axelrod; A. C. Becker; D. P. Bennett; P. A. Charles; K. H. Cook; A. J. Drake; K. C. Freeman; M. Geha; K. Griest; M. J. Lehner; S. L. Marshall; K. E. McGowan; D. Minniti; C. A. Nelson; B. A. Peterson; P. Popowski; M. R. Pratt; P. J. Quinn; C. W. Stubbs; W. Sutherland; A. B. Tomaney; T. Vandehei; D. L. Welch

doi:10.1046/j.1365-8711.2001.04041.x

A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring

C. Alcock^*, R. A. Allsman, D. R. Alves, T. S. Axelrod, A. C. Becker, D. P. Bennett, P. A. Charles, K. H. Cook, A. J. Drake, K. C. Freeman, M. Geha, K. Griest, M. J. Lehner, S. L. Marshall, K. E. McGowan, D. Minniti, C. A. Nelson, B. A. Peterson, P. Popowski, M. R. PrattP. J. Quinn, C. W. Stubbs, W. Sutherland, A. B. Tomaney, T. Vandehei, D. L. Welch

^*Corresponding author for this work

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Abstract

We present a ∼5-yr optical light curve of the recurrent Be/X-ray transient A0538-66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at P = 420.8 ± 0.8 d and a short-term modulation at 16.6510 ± 0.0022 d which, within errors, confirms the previously found orbital period. Furthermore, the orbital activity is only seen at certain phases of the 421-d cycle, suggesting that the long-term modulation is related to variations in the Be star envelope.

Original language	English
Pages (from-to)	678-684
Number of pages	7
Journal	Monthly Notices of the Royal Astronomical Society
Volume	321
Issue number	4
DOIs	https://doi.org/10.1046/j.1365-8711.2001.04041.x
Publication status	Published - 11 Mar 2001

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Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Becker, A. C., Bennett, D. P., Charles, P. A., Cook, K. H., Drake, A. J., Freeman, K. C., Geha, M., Griest, K., Lehner, M. J., Marshall, S. L., McGowan, K. E., Minniti, D., Nelson, C. A., Peterson, B. A., Popowski, P., ... Welch, D. L. (2001). A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring. Monthly Notices of the Royal Astronomical Society, 321(4), 678-684. https://doi.org/10.1046/j.1365-8711.2001.04041.x

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title = "A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring",

abstract = "We present a ∼5-yr optical light curve of the recurrent Be/X-ray transient A0538-66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at P = 420.8 ± 0.8 d and a short-term modulation at 16.6510 ± 0.0022 d which, within errors, confirms the previously found orbital period. Furthermore, the orbital activity is only seen at certain phases of the 421-d cycle, suggesting that the long-term modulation is related to variations in the Be star envelope.",

keywords = "Binaries: Close, Stars: Individual: A0538-66, X-rays: Stars",

author = "C. Alcock and Allsman, {R. A.} and Alves, {D. R.} and Axelrod, {T. S.} and Becker, {A. C.} and Bennett, {D. P.} and Charles, {P. A.} and Cook, {K. H.} and Drake, {A. J.} and Freeman, {K. C.} and M. Geha and K. Griest and Lehner, {M. J.} and Marshall, {S. L.} and McGowan, {K. E.} and D. Minniti and Nelson, {C. A.} and Peterson, {B. A.} and P. Popowski and Pratt, {M. R.} and Quinn, {P. J.} and Stubbs, {C. W.} and W. Sutherland and Tomaney, {A. B.} and T. Vandehei and Welch, {D. L.}",

year = "2001",

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doi = "10.1046/j.1365-8711.2001.04041.x",

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pages = "678--684",

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Alcock, C, Allsman, RA, Alves, DR, Axelrod, TS, Becker, AC, Bennett, DP, Charles, PA, Cook, KH, Drake, AJ, Freeman, KC, Geha, M, Griest, K, Lehner, MJ, Marshall, SL, McGowan, KE, Minniti, D, Nelson, CA, Peterson, BA, Popowski, P, Pratt, MR, Quinn, PJ, Stubbs, CW, Sutherland, W, Tomaney, AB, Vandehei, T & Welch, DL 2001, 'A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring', Monthly Notices of the Royal Astronomical Society, vol. 321, no. 4, pp. 678-684. https://doi.org/10.1046/j.1365-8711.2001.04041.x

TY - JOUR

T1 - A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring

AU - Alcock, C.

AU - Allsman, R. A.

AU - Alves, D. R.

AU - Axelrod, T. S.

AU - Becker, A. C.

AU - Bennett, D. P.

AU - Charles, P. A.

AU - Cook, K. H.

AU - Drake, A. J.

AU - Freeman, K. C.

AU - Geha, M.

AU - Griest, K.

AU - Lehner, M. J.

AU - Marshall, S. L.

AU - McGowan, K. E.

AU - Minniti, D.

AU - Nelson, C. A.

AU - Peterson, B. A.

AU - Popowski, P.

AU - Pratt, M. R.

AU - Quinn, P. J.

AU - Stubbs, C. W.

AU - Sutherland, W.

AU - Tomaney, A. B.

AU - Vandehei, T.

AU - Welch, D. L.

PY - 2001/3/11

Y1 - 2001/3/11

N2 - We present a ∼5-yr optical light curve of the recurrent Be/X-ray transient A0538-66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at P = 420.8 ± 0.8 d and a short-term modulation at 16.6510 ± 0.0022 d which, within errors, confirms the previously found orbital period. Furthermore, the orbital activity is only seen at certain phases of the 421-d cycle, suggesting that the long-term modulation is related to variations in the Be star envelope.

AB - We present a ∼5-yr optical light curve of the recurrent Be/X-ray transient A0538-66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at P = 420.8 ± 0.8 d and a short-term modulation at 16.6510 ± 0.0022 d which, within errors, confirms the previously found orbital period. Furthermore, the orbital activity is only seen at certain phases of the 421-d cycle, suggesting that the long-term modulation is related to variations in the Be star envelope.

KW - Binaries: Close

KW - Stars: Individual: A0538-66

KW - X-rays: Stars

UR - http://www.scopus.com/inward/record.url?scp=18044404424&partnerID=8YFLogxK

U2 - 10.1046/j.1365-8711.2001.04041.x

DO - 10.1046/j.1365-8711.2001.04041.x

M3 - Article

SN - 0035-8711

VL - 321

SP - 678

EP - 684

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

A 421-d activity cycle in the BeX recurrent transient A0538-66 from MACHO monitoring

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