IGR J19552+0044: A new asynchronous short period polar: Filling the gap between intermediate and ordinary polars

G. Tovmassian; D. González-Buitrago; J. Thorstensen; E. Kotze; H. Breytenbach; A. Schwope; F. Bernardini; S. V. Zharikov; M. S. Hernandez; D. A.H. Buckley; E. De Miguel; F. J. Hambsch; G. Myers; W. Goff; D. Cejudo; D. Starkey; T. Campbell; J. Ulowetz; W. Stein; P. Nelson; D. E. Reichart; J. B. Haislip; K. M. Ivarsen; A. P. Lacluyze; J. P. Moore; A. S. Miroshnichenko

doi:10.1051/0004-6361/201731323

IGR J19552+0044: A new asynchronous short period polar: Filling the gap between intermediate and ordinary polars

G. Tovmassian, D. González-Buitrago, J. Thorstensen, E. Kotze, H. Breytenbach, A. Schwope, F. Bernardini, S. V. Zharikov, M. S. Hernandez, D. A.H. Buckley, E. De Miguel, F. J. Hambsch, G. Myers, W. Goff, D. Cejudo, D. Starkey, T. Campbell, J. Ulowetz, W. Stein, P. NelsonD. E. Reichart, J. B. Haislip, K. M. Ivarsen, A. P. Lacluyze, J. P. Moore, A. S. Miroshnichenko

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

Abstract

Context. Based on XMM-Newton X-ray observations IGR J19552+0044 appears to be either a pre-polar or an asynchronous polar. Aims. We conducted follow-up optical observations to identify the sources and periods of variability precisely and to classify this X-ray source correctly. Methods. Extensive multicolor photometric and medium- to high-resolution spectroscopy observations were performed and period search codes were applied to sort out the complex variability of the object. Results. We found firm evidence of discording spectroscopic (81.29 ± 0.01 m) and photometric (83.599 ± 0.002 m) periods that we ascribe to the white dwarf (WD) spin period and binary orbital period, respectively. This confirms that IGR J19552+0044 is an asynchronous polar. Wavelength dependent variability and its continuously changing shape point at a cyclotron emission from a magnetic WD with a relatively low magnetic field below 20 MG. Conclusions. The difference between the WD spin period and the binary orbital period proves that IGR J19552+0044 is a polar with the largest known degree of asynchronism (0.97 or 3%).

Original language	English (US)
Article number	A36
Journal	Astronomy and Astrophysics
Volume	608
DOIs	https://doi.org/10.1051/0004-6361/201731323
State	Published - Dec 1 2017

Keywords

Accretion, accretion disks
Binaries: close
Stars: magnetic field

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361/201731323

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Tovmassian, G., González-Buitrago, D., Thorstensen, J., Kotze, E., Breytenbach, H., Schwope, A., Bernardini, F., Zharikov, S. V., Hernandez, M. S., Buckley, D. A. H., De Miguel, E., Hambsch, F. J., Myers, G., Goff, W., Cejudo, D., Starkey, D., Campbell, T., Ulowetz, J., Stein, W., ... Miroshnichenko, A. S. (2017). IGR J19552+0044: A new asynchronous short period polar: Filling the gap between intermediate and ordinary polars. Astronomy and Astrophysics, 608, Article A36. https://doi.org/10.1051/0004-6361/201731323

Tovmassian, G, González-Buitrago, D, Thorstensen, J, Kotze, E, Breytenbach, H, Schwope, A, Bernardini, F, Zharikov, SV, Hernandez, MS, Buckley, DAH, De Miguel, E, Hambsch, FJ, Myers, G, Goff, W, Cejudo, D, Starkey, D, Campbell, T, Ulowetz, J, Stein, W, Nelson, P, Reichart, DE, Haislip, JB, Ivarsen, KM, Lacluyze, AP, Moore, JP & Miroshnichenko, AS 2017, 'IGR J19552+0044: A new asynchronous short period polar: Filling the gap between intermediate and ordinary polars', Astronomy and Astrophysics, vol. 608, A36. https://doi.org/10.1051/0004-6361/201731323

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title = "IGR J19552+0044: A new asynchronous short period polar: Filling the gap between intermediate and ordinary polars",

abstract = "Context. Based on XMM-Newton X-ray observations IGR J19552+0044 appears to be either a pre-polar or an asynchronous polar. Aims. We conducted follow-up optical observations to identify the sources and periods of variability precisely and to classify this X-ray source correctly. Methods. Extensive multicolor photometric and medium- to high-resolution spectroscopy observations were performed and period search codes were applied to sort out the complex variability of the object. Results. We found firm evidence of discording spectroscopic (81.29 ± 0.01 m) and photometric (83.599 ± 0.002 m) periods that we ascribe to the white dwarf (WD) spin period and binary orbital period, respectively. This confirms that IGR J19552+0044 is an asynchronous polar. Wavelength dependent variability and its continuously changing shape point at a cyclotron emission from a magnetic WD with a relatively low magnetic field below 20 MG. Conclusions. The difference between the WD spin period and the binary orbital period proves that IGR J19552+0044 is a polar with the largest known degree of asynchronism (0.97 or 3%).",

keywords = "Accretion, accretion disks, Binaries: close, Stars: magnetic field",

author = "G. Tovmassian and D. Gonz{\'a}lez-Buitrago and J. Thorstensen and E. Kotze and H. Breytenbach and A. Schwope and F. Bernardini and Zharikov, {S. V.} and Hernandez, {M. S.} and Buckley, {D. A.H.} and {De Miguel}, E. and Hambsch, {F. J.} and G. Myers and W. Goff and D. Cejudo and D. Starkey and T. Campbell and J. Ulowetz and W. Stein and P. Nelson and Reichart, {D. E.} and Haislip, {J. B.} and Ivarsen, {K. M.} and Lacluyze, {A. P.} and Moore, {J. P.} and Miroshnichenko, {A. S.}",

note = "Publisher Copyright: {\textcopyright} ESO, 2017.",

year = "2017",

month = dec,

day = "1",

doi = "10.1051/0004-6361/201731323",

language = "English (US)",

volume = "608",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

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TY - JOUR

T1 - IGR J19552+0044

T2 - A new asynchronous short period polar: Filling the gap between intermediate and ordinary polars

AU - Tovmassian, G.

AU - González-Buitrago, D.

AU - Thorstensen, J.

AU - Kotze, E.

AU - Breytenbach, H.

AU - Schwope, A.

AU - Bernardini, F.

AU - Zharikov, S. V.

AU - Hernandez, M. S.

AU - Buckley, D. A.H.

AU - De Miguel, E.

AU - Hambsch, F. J.

AU - Myers, G.

AU - Goff, W.

AU - Cejudo, D.

AU - Starkey, D.

AU - Campbell, T.

AU - Ulowetz, J.

AU - Stein, W.

AU - Nelson, P.

AU - Reichart, D. E.

AU - Haislip, J. B.

AU - Ivarsen, K. M.

AU - Lacluyze, A. P.

AU - Moore, J. P.

AU - Miroshnichenko, A. S.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Context. Based on XMM-Newton X-ray observations IGR J19552+0044 appears to be either a pre-polar or an asynchronous polar. Aims. We conducted follow-up optical observations to identify the sources and periods of variability precisely and to classify this X-ray source correctly. Methods. Extensive multicolor photometric and medium- to high-resolution spectroscopy observations were performed and period search codes were applied to sort out the complex variability of the object. Results. We found firm evidence of discording spectroscopic (81.29 ± 0.01 m) and photometric (83.599 ± 0.002 m) periods that we ascribe to the white dwarf (WD) spin period and binary orbital period, respectively. This confirms that IGR J19552+0044 is an asynchronous polar. Wavelength dependent variability and its continuously changing shape point at a cyclotron emission from a magnetic WD with a relatively low magnetic field below 20 MG. Conclusions. The difference between the WD spin period and the binary orbital period proves that IGR J19552+0044 is a polar with the largest known degree of asynchronism (0.97 or 3%).

AB - Context. Based on XMM-Newton X-ray observations IGR J19552+0044 appears to be either a pre-polar or an asynchronous polar. Aims. We conducted follow-up optical observations to identify the sources and periods of variability precisely and to classify this X-ray source correctly. Methods. Extensive multicolor photometric and medium- to high-resolution spectroscopy observations were performed and period search codes were applied to sort out the complex variability of the object. Results. We found firm evidence of discording spectroscopic (81.29 ± 0.01 m) and photometric (83.599 ± 0.002 m) periods that we ascribe to the white dwarf (WD) spin period and binary orbital period, respectively. This confirms that IGR J19552+0044 is an asynchronous polar. Wavelength dependent variability and its continuously changing shape point at a cyclotron emission from a magnetic WD with a relatively low magnetic field below 20 MG. Conclusions. The difference between the WD spin period and the binary orbital period proves that IGR J19552+0044 is a polar with the largest known degree of asynchronism (0.97 or 3%).

KW - Accretion, accretion disks

KW - Binaries: close

KW - Stars: magnetic field

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U2 - 10.1051/0004-6361/201731323

DO - 10.1051/0004-6361/201731323

M3 - Article

AN - SCOPUS:85037989297

SN - 0004-6361

VL - 608

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A36

ER -

IGR J19552+0044: A new asynchronous short period polar: Filling the gap between intermediate and ordinary polars

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Keywords

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