A STUDY OF THE PHOTOMETRIC VARIABILITY OF THE PECULIAR MAGNETIC WHITE DWARF WD 1953-011

Valyavin, G; Clark, D M; Machado, Lester Fox; Alvarez, M; Lopez, J M; Hiriart, D; Zharikov, S V; Antonyuk, K; Plachinda, S; Wade, G A; Han, Inwoo; Jeon, Young-Beom; Bagnulo, S; Zurita, C; Mujica, R; Shulyak, D; Burlakova, T

doi:10.1088/0004-637X/734/1/17

Title: A STUDY OF THE PHOTOMETRIC VARIABILITY OF THE PECULIAR MAGNETIC WHITE DWARF WD 1953-011

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Abstract

We present and interpret simultaneous new photometric and spectroscopic observations of the peculiar magnetic white dwarf WD 1953-011. The flux in the V-band filter and intensity of the Balmer spectral lines demonstrate variability with the rotation period of about 1.45 days. According to previous studies, this variability can be explained by the presence of a dark spot having a magnetic nature, analogous to a sunspot. Motivated by this idea, we examine possible physical relationships between the suggested dark spot and the strong-field magnetic structure (magnetic 'spot' or 'tube') recently identified on the surface of this star. Comparing the rotationally modulated flux with the variable spectral observables related to the magnetic 'spot', we establish their correlation and therefore their physical relationship. Modeling the variable photometric flux assuming that it is associated with temperature variations in the stellar photosphere, we argue that the strong-field area and dark, low-temperature spot are comparable in size and located at the same latitudes, essentially overlapping each other with a possible slight longitudinal shift. In this paper, we also present a new, improved value of the star's rotational period and constrain the characteristics of the thermal inhomogeneity over the degenerate's surface.

Authors:

Valyavin, G; Clark, D M; Machado, Lester Fox; Alvarez, M; Lopez, J M; Hiriart, D; Zharikov, S V ^[1]; Antonyuk, K; Plachinda, S ^[2]; Wade, G A ^[3]; Han, Inwoo; Jeon, Young-Beom ^[4]; Bagnulo, S ^[5]; Zurita, C ^[6]; Mujica, R ^[7]; Shulyak, D ^[8]; Burlakova, T ^[9]

Observatorio Astronomico Nacional SPM, Instituto de AstronomIa, Universidad Nacional Autonoma de Mexico, Ensenada, BC (Mexico)
Crimean Astrophysical Observatory, Nauchny, Crimea (Ukraine)
Physics Department, Royal Military College of Canada, Kingston, Ontario (Canada)
Korea Astronomy and Space Science Institute, 61-1, Whaam-Dong, Youseong-Gu, Daejeon 305-348 (Korea, Republic of)
Armagh Observatory, Armagh (United Kingdom)
Instituto de Astrofisica de Canarias, 38200, La Laguna, Tenerife (Spain)
Instituto Nacional de Astrofisica, Optica y ElectronIca, Apartado Postal 51 y 216, 72000 Tonantzintla, Pueblo (Mexico)
Astrophysics, Georg-August-University, Friedrich-Hund-Platz 1, D-37077 Goettingen (Germany)
Special Astrophysical Observatory, Zelenchukskaya (Russian Federation)

Publication Date:: Fri Jun 10 00:00:00 EDT 2011

OSTI Identifier:: 21576689

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 734; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/734/1/17; Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BALMER LINES; MAGNETIC FIELDS; ROTATION; SIMULATION; WHITE DWARF STARS; DWARF STARS; MOTION; STARS

Citation Formats


                    Valyavin, G, Clark, D M, Machado, Lester Fox, Alvarez, M, Lopez, J M, Hiriart, D, Zharikov, S V, Antonyuk, K, Plachinda, S, Wade, G A, Han, Inwoo, Jeon, Young-Beom, Bagnulo, S, Zurita, C, Mujica, R, Shulyak, D, and Burlakova, T. A STUDY OF THE PHOTOMETRIC VARIABILITY OF THE PECULIAR MAGNETIC WHITE DWARF WD 1953-011.  United States: N. p., 2011. 
        Web.  doi:10.1088/0004-637X/734/1/17.

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                    Valyavin, G, Clark, D M, Machado, Lester Fox, Alvarez, M, Lopez, J M, Hiriart, D, Zharikov, S V, Antonyuk, K, Plachinda, S, Wade, G A, Han, Inwoo, Jeon, Young-Beom, Bagnulo, S, Zurita, C, Mujica, R, Shulyak, D, & Burlakova, T. A STUDY OF THE PHOTOMETRIC VARIABILITY OF THE PECULIAR MAGNETIC WHITE DWARF WD 1953-011.  United States.  https://doi.org/10.1088/0004-637X/734/1/17

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                    Valyavin, G, Clark, D M, Machado, Lester Fox, Alvarez, M, Lopez, J M, Hiriart, D, Zharikov, S V, Antonyuk, K, Plachinda, S, Wade, G A, Han, Inwoo, Jeon, Young-Beom, Bagnulo, S, Zurita, C, Mujica, R, Shulyak, D, and Burlakova, T. 2011.  
        "A STUDY OF THE PHOTOMETRIC VARIABILITY OF THE PECULIAR MAGNETIC WHITE DWARF WD 1953-011".  United States.  https://doi.org/10.1088/0004-637X/734/1/17.

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@article{osti_21576689,

  title        = {A STUDY OF THE PHOTOMETRIC VARIABILITY OF THE PECULIAR MAGNETIC WHITE DWARF WD 1953-011},

  author       = {Valyavin, G and Clark, D M and Machado, Lester Fox and Alvarez, M and Lopez, J M and Hiriart, D and Zharikov, S V and Antonyuk, K and Plachinda, S and Wade, G A and Han, Inwoo and Jeon, Young-Beom and Bagnulo, S and Zurita, C and Mujica, R and Shulyak, D and Burlakova, T},

  abstractNote = {We present and interpret simultaneous new photometric and spectroscopic observations of the peculiar magnetic white dwarf WD 1953-011. The flux in the V-band filter and intensity of the Balmer spectral lines demonstrate variability with the rotation period of about 1.45 days. According to previous studies, this variability can be explained by the presence of a dark spot having a magnetic nature, analogous to a sunspot. Motivated by this idea, we examine possible physical relationships between the suggested dark spot and the strong-field magnetic structure (magnetic 'spot' or 'tube') recently identified on the surface of this star. Comparing the rotationally modulated flux with the variable spectral observables related to the magnetic 'spot', we establish their correlation and therefore their physical relationship. Modeling the variable photometric flux assuming that it is associated with temperature variations in the stellar photosphere, we argue that the strong-field area and dark, low-temperature spot are comparable in size and located at the same latitudes, essentially overlapping each other with a possible slight longitudinal shift. In this paper, we also present a new, improved value of the star's rotational period and constrain the characteristics of the thermal inhomogeneity over the degenerate's surface.},

  doi          = {10.1088/0004-637X/734/1/17},

  url          = {https://www.osti.gov/biblio/21576689},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 734,

  place        = {United States},

  year         = {Fri Jun 10 00:00:00 EDT 2011},

  month        = {Fri Jun 10 00:00:00 EDT 2011}

}

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