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PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU

Year 2018, Volume: 60 Issue: 2, 27 - 40, 01.08.2018

Abstract

In
this study, high-precision photometric data of V960 Tau are presented in order
to reveal the pulsation characteristics of the star. The data are taken from
the HI-1A instrument of the STEREO
satellite between 2007 and 2011. The results of the photometric analysis are
compared with findings derived from spectroscopic line measurements (equivalent
width and line intensity) to have a better understanding of the relation
between light curve variabilities and circumstellar disk structure. As a result
of the photometric and spectroscopic analyses, it is seen that frequency
distribution and amplitude intensities of the star are the same with those of a
typical Be star. The star has at least 14 independent frequencies and most of
these are accumulated around the peaks at 1.01 and 1.95 c/d. With this
configuration, the star exhibits 2:1 frequency distribution. Even though the
frequency distribution is quite similar to a Slowly Pulsating B type star, V960
Tau may be considered as a β Cephei
type variable based on its temperature and luminosity values. Additionally, the
equivalent width and line intensity values of the emission lines appear to be correlated
with the light curve variations. This may be an indication that the photometric
variations may be related to the environmental disc structure.

References

  • M. Jaschek, C. Jaschek, A. M. Hubert-Delplace, and H. Hubert, “A classification of Be stars”, Astronomy and Astrophysics Supplement Series, vol. 42, pp.103-114, October 1980.
  • O. Struve, “On the Origin of Bright Lines in Spectra of Stars of Class B”, Astrophysical Journal, vol. 73, pp. 94, March 1931.
  • J. M. Porter and T. Rivinius, “Classical Be Stars”, The Publications of the Astronomical Society of the Pacific, vol. 115, pp. 1153-1170, October 2003.
  • A. C. Carciofi, A. T. Okazaki, J. B. Le Bouquin, S. Stefl, T. Rivinius, D. Baade, J. E. Bjorkman, and C. A. Hummel, “Cyclic variability of the circumstellar disk of the Be star ζ Tauri. II. Testing the 2D global disk oscillation model”, Astronomy and Astrophysics, vol. 504, pp. 915-927, September 2009.
  • M. Bossi, G. Guerrero, and G. Bianchini, “Photometric Multiperiodicity of the Be Star 120 Tauri”, Information Bulletin on Variable Stars, vol. 3348, pp. 1, July 1989.
  • C. J. Eyles, R. A. Harrison, C. J. Davis, N. R. Waltham, B. M. Shaughnessy, H. C. A. Mapson-Menard, D. Bewsher, S. R. Crothers, J. A. Davies, G. M. Simnett, R. A. Howard, J. D. Moses, J. S. Newmark, D. G. Socker, J.-P. Halain, J.-M. Defise, E. Mazy, and P. Rochus, “The Heliospheric Imagers Onboard the STEREO Mission”, Solar Physics, vol. 254, pp. 387-445, February 2009.
  • V. Sangaralingam and I. R. Stevens, “STEREO TRansiting Exoplanet and Stellar Survey (STRESS) - I. Introduction and data pipeline”, Monthly Notices of the Royal Astronomical Society, vol. 418, pp. 1325-1334, December 2011.
  • C. E. Jones, C. Tycner, and A. D. Smith, “The Variability of Hα Equivalent Widths in Be Stars”, The Astronomical Journal, vol. 141, pp. 150, May 2011.
  • Y. Fremat, J. Zorec, A. M. Hubert, and M. Floquet, “Effects of gravitational darkening on the determination of fundamental parameters in fast-rotating B-type stars”, Astronomy and Astrophysics, vol. 440, pp. 305-320, September 2005.
  • C. Neiner and A.-M. Hubert, “The pulsations of Be stars”, Communications in Asteroseismology, vol. 158, pp. 194, July 2009.
  • A. M. Hubert and M. Floquet, “Investigation of the variability of bright Be stars using HIPPARCOS photometry”, Astronomy and Astrophysics, vol. 335, pp. 565-572, July 1998.
  • C. Cameron, H. Saio, R. Kuschnig, G. A. H. Walker, J. M. Matthews, D. B. Guenther, A. F. J. Moffat, S. M. Rucinski, D. Sasselov, and W. W. Weiss, “MOST Detects SPBe Pulsations in HD 127756 and HD 217543: Asteroseismic Rotation Rates Independent of vsini”, The Astrophysical Journal, vol. 685, pp. 489-507, September 2008.
  • H. Saio, “A- and B-type star pulsations in the Kepler and CoRoT era: theoretical considerations”, In G. Mathys, E. R. Griffin, O. Kochukhov, R. Monier, and G. M. Wahlgren, editors, Putting A Stars into Context: Evolution, Environment, and Related Stars, pp. 305-313, November 2014.
  • P. J. Flower, “Transformations from Theoretical H-R Diagrams to C-M Diagrams”, Astronomy and Astrophysics, vol. 54, pp. 31, January 1977.
  • H. Saio, “Prospects for Asteroseismology of Rapidly Rotating B-Type Stars”. In M. Goupil, K. Belkacem, C. Neiner, F. Ligni`eres, and J. J. Green, editors, Lecture Notes in Physics, Berlin Springer Verlag, vol. 865 of Lecture Notes in Physics, Berlin Springer Verlag, pp. 159, 2013.
  • L. A. Balona, “Short-period variability in Be stars”, Monthly Notices of the Royal Astronomical Society, vol. 245, pp. 92-100, July 1990.
Year 2018, Volume: 60 Issue: 2, 27 - 40, 01.08.2018

Abstract

References

  • M. Jaschek, C. Jaschek, A. M. Hubert-Delplace, and H. Hubert, “A classification of Be stars”, Astronomy and Astrophysics Supplement Series, vol. 42, pp.103-114, October 1980.
  • O. Struve, “On the Origin of Bright Lines in Spectra of Stars of Class B”, Astrophysical Journal, vol. 73, pp. 94, March 1931.
  • J. M. Porter and T. Rivinius, “Classical Be Stars”, The Publications of the Astronomical Society of the Pacific, vol. 115, pp. 1153-1170, October 2003.
  • A. C. Carciofi, A. T. Okazaki, J. B. Le Bouquin, S. Stefl, T. Rivinius, D. Baade, J. E. Bjorkman, and C. A. Hummel, “Cyclic variability of the circumstellar disk of the Be star ζ Tauri. II. Testing the 2D global disk oscillation model”, Astronomy and Astrophysics, vol. 504, pp. 915-927, September 2009.
  • M. Bossi, G. Guerrero, and G. Bianchini, “Photometric Multiperiodicity of the Be Star 120 Tauri”, Information Bulletin on Variable Stars, vol. 3348, pp. 1, July 1989.
  • C. J. Eyles, R. A. Harrison, C. J. Davis, N. R. Waltham, B. M. Shaughnessy, H. C. A. Mapson-Menard, D. Bewsher, S. R. Crothers, J. A. Davies, G. M. Simnett, R. A. Howard, J. D. Moses, J. S. Newmark, D. G. Socker, J.-P. Halain, J.-M. Defise, E. Mazy, and P. Rochus, “The Heliospheric Imagers Onboard the STEREO Mission”, Solar Physics, vol. 254, pp. 387-445, February 2009.
  • V. Sangaralingam and I. R. Stevens, “STEREO TRansiting Exoplanet and Stellar Survey (STRESS) - I. Introduction and data pipeline”, Monthly Notices of the Royal Astronomical Society, vol. 418, pp. 1325-1334, December 2011.
  • C. E. Jones, C. Tycner, and A. D. Smith, “The Variability of Hα Equivalent Widths in Be Stars”, The Astronomical Journal, vol. 141, pp. 150, May 2011.
  • Y. Fremat, J. Zorec, A. M. Hubert, and M. Floquet, “Effects of gravitational darkening on the determination of fundamental parameters in fast-rotating B-type stars”, Astronomy and Astrophysics, vol. 440, pp. 305-320, September 2005.
  • C. Neiner and A.-M. Hubert, “The pulsations of Be stars”, Communications in Asteroseismology, vol. 158, pp. 194, July 2009.
  • A. M. Hubert and M. Floquet, “Investigation of the variability of bright Be stars using HIPPARCOS photometry”, Astronomy and Astrophysics, vol. 335, pp. 565-572, July 1998.
  • C. Cameron, H. Saio, R. Kuschnig, G. A. H. Walker, J. M. Matthews, D. B. Guenther, A. F. J. Moffat, S. M. Rucinski, D. Sasselov, and W. W. Weiss, “MOST Detects SPBe Pulsations in HD 127756 and HD 217543: Asteroseismic Rotation Rates Independent of vsini”, The Astrophysical Journal, vol. 685, pp. 489-507, September 2008.
  • H. Saio, “A- and B-type star pulsations in the Kepler and CoRoT era: theoretical considerations”, In G. Mathys, E. R. Griffin, O. Kochukhov, R. Monier, and G. M. Wahlgren, editors, Putting A Stars into Context: Evolution, Environment, and Related Stars, pp. 305-313, November 2014.
  • P. J. Flower, “Transformations from Theoretical H-R Diagrams to C-M Diagrams”, Astronomy and Astrophysics, vol. 54, pp. 31, January 1977.
  • H. Saio, “Prospects for Asteroseismology of Rapidly Rotating B-Type Stars”. In M. Goupil, K. Belkacem, C. Neiner, F. Ligni`eres, and J. J. Green, editors, Lecture Notes in Physics, Berlin Springer Verlag, vol. 865 of Lecture Notes in Physics, Berlin Springer Verlag, pp. 159, 2013.
  • L. A. Balona, “Short-period variability in Be stars”, Monthly Notices of the Royal Astronomical Society, vol. 245, pp. 92-100, July 1990.
There are 16 citations in total.

Details

Primary Language English
Journal Section Review Articles
Authors

Doğuş Özuyar 0000-0001-8544-0950

Publication Date August 1, 2018
Submission Date July 10, 2018
Acceptance Date November 2, 2018
Published in Issue Year 2018 Volume: 60 Issue: 2

Cite

APA Özuyar, D. (2018). PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU. Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering, 60(2), 27-40.
AMA Özuyar D. PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU. Commun.Fac.Sci.Univ.Ank.Series A2-A3: Phys.Sci. and Eng. August 2018;60(2):27-40.
Chicago Özuyar, Doğuş. “PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU”. Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering 60, no. 2 (August 2018): 27-40.
EndNote Özuyar D (August 1, 2018) PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU. Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering 60 2 27–40.
IEEE D. Özuyar, “PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU”, Commun.Fac.Sci.Univ.Ank.Series A2-A3: Phys.Sci. and Eng., vol. 60, no. 2, pp. 27–40, 2018.
ISNAD Özuyar, Doğuş. “PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU”. Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering 60/2 (August 2018), 27-40.
JAMA Özuyar D. PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU. Commun.Fac.Sci.Univ.Ank.Series A2-A3: Phys.Sci. and Eng. 2018;60:27–40.
MLA Özuyar, Doğuş. “PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU”. Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering, vol. 60, no. 2, 2018, pp. 27-40.
Vancouver Özuyar D. PHOTOMETRIC AND SPECTROSCOPIC VARIABILITY OF A POSSIBLE β CEPHEI STAR; V960 TAU. Commun.Fac.Sci.Univ.Ank.Series A2-A3: Phys.Sci. and Eng. 2018;60(2):27-40.

Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering

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