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Superfast Stellar Pulsations from O to A Stars

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Abstract

New results of our studies of superfast variability on the minute and second scales of line profiles in the spectra of early type stars are presented. The spectra of program BA stars were obtained with the 1.25-meter telescope of the Crimean SAI station with exposures from 1.5 to 20 seconds and a total observation time of 2–3 hours. The variability of Hβ and Hα line profiles in spectra of program stars is analyzed. The studied stars have regular line profile variations with periods from 5 to 90 minutes and amplitudes of 0.5–2% of the continuum level. For better understanding the superfast variability of BA stars the X-Ray spectra and X-Ray light curves of selected Be stars obtained on the XMM-Newton satellite are analyzed. The variability of X-ray fluxes for HD 110 432, the analogue of γ Cas stars, on minute time scales is detected. It is shown that a nonthermal contribution into X-rays of the γ Cas analogues can be significant.

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REFERENCES

  1. Di Mauro, M.P., A review on asteroseismology, in Frontier Research in Astrophysics II, Mondello, Palermo, Italy, 2016, id 29.

  2. Le Contel, J.M., Sareyan, J.P., and Dantel, M., Short period variable stars. II. Variations in the spectrum of the beta CMa star HD 43818, Astron. Astrophys., 1970, vol. 8, id 29.

  3. Hamaguchi, K., Drake, S., Corcoran, M., et al., First NICER observations of the Enigmatic Be Star, Gamma Cassiopeiae, in AAS Meeting, 2018, vol. 231, id 349.12.

  4. Hubrig, S., Schöller, M., and Kholtygin, A.F., Short time-scale spectral variability in the A0 supergiant HD 92 207 and the importance of line profile variations for the interpretation of FORS 2 spectropolarimetric observations, Mon. Not. R. Astron. Soc., 2014, vol. 440, no. 2, pp. 1779–1785.

    Article  Google Scholar 

  5. Hubrig, S., Küker, M., Järvinen, S.P., et al., A short and sudden increase of the magnetic field strength and the accompanying spectral variability in the O9.7 V star HD 54879, Mon. Not. R. Astron. Soc., 2019, vol. 484, pp. 4495–4506.

    Article  Google Scholar 

  6. Kaper, L., Henrichs, H.F., Fullerton, A.W., et al., Coordinated ultraviolet and Hα spectroscopy of bright O-type stars, Astron. Astrophys., 1997, vol. 327, pp. 281–298.

    Google Scholar 

  7. Kholtygin, A.F., Monin, D.N., Surkov, A.E., and Fabrika, S.N., Fast line-profile variability in the spectra of O stars, Astron. Lett., 2003, vol. 29, pp. 175–187.

    Article  Google Scholar 

  8. Kholtygin, A.F., Batrakov, A.A., Fabrika, S.N., et al., Super-fast line-profile variability in the spectra of OBA-stars: B1-star ρ Leo, Astrophys. Bull., 2018, vol. 73, no. 4, pp. 471–477.

    Article  Google Scholar 

  9. Kholtygin, A.F., Ikonnikova, N.P., Dodin, A.V., and Tsiopa, O.A., Superfast line profile variability in the spectra of ρ Leo: New results, Astron. Lett., 2020a, vol. 46, no. 3, pp. 168–176.

    Article  Google Scholar 

  10. Kholtygin, A.F., Batrakov, A.A., Fabrika, S.N., et al., Super-fast line-profile variability in the spectra of OBA stars. II. A0 star α2 CVn, Astrophys. Bull., 2020b, vol. 75, no. 3, pp. 278–283.

    Article  Google Scholar 

  11. Kholtygin, A.F., Moiseeva, A.V., Yakunin, I.A., and Hubrig, S., Superfast line profile variations in the spectra of OBA stars. III. A0 star α2 Cvn, new results, Astrophys. Bull., 2020c, vol. 75, pp. 284–293.

    Article  Google Scholar 

  12. Kholtygin, A.F., Moiseeva, A.V., Kurdoyakova, M.S., et al., Super-fast line-profile variability in the spectra of OBA stars. IV: ζ Ori A, Astrophys. Bull., 2021a, vol. 76, no. 2, pp. 185–195.

    Article  Google Scholar 

  13. Kholtygin, A.F., Burlak, M.A., and Tsiopa, O.A., Unusual fast spectral variability of γ Cas, Astron. Tsirk., 2021b, no. 1649, pp. 1–4.

  14. Kochukhov, O., Adelman, S.J., Gulliver, A.F., and Piskunov, N., Weather in stellar atmosphere revealed by the dynamics of mercury clouds in α Andromedae, Nat. Phys., 2007, vol. 3, pp. 526–529.

    Article  Google Scholar 

  15. Korzennik, S.G., Rabello-Soares, M.C., Schou, J., and Larson, T.P., Accurate characterization of high-degree modes using MDI observations, Astrophys. J., 2013, vol. 772, no. 2, id 87.

  16. Roberts, D.H., Lehar, J., and Dreher, J.W., Time series analysis with CLEAN. I. Derivation of a spectrum, Astron. J., 1987, vol. 93, pp. 968–989.

    Article  Google Scholar 

  17. Ryabchikova, T.A., Malanushenko, V.P., and Adelman, S.J., Orbital elements and abundance analyses of the double-lined spectroscopic binary α Andromedae, Astron. Astrophys., 1999, vol. 351, pp. 963–972.

    Google Scholar 

  18. Ryspaeva, E.B. and Kholtygin, A.F., Contribution of a non-thermal component to the X-ray emission of OB stars, Astrophys. Bull., 2020, vol. 75, pp. 127–138.

    Article  Google Scholar 

  19. Smith, M.A. and Polidan, R.S., Dynamic processes in Be star atmospheres. I - 'Dimple' formation in the He I lambda 6678 line of lambda Eridani, Astrophys. J., 1993, vol. 408, no. 1, pp. 323–336.

    Article  Google Scholar 

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Funding

The work was supported by the Russian Foundation for Basic Research, grant no. 19-02-00311 À. The work of I. Ya. Yakunin was supported of by the Russian Foundation for Basic Research, project no. 19-32-60007. Observations with the SAO RAS telescopes were supported by the Ministry of Science and Higher Education of the Russian Federation, agreement no. 05.619.21.0016 (unique project identifier RFMEFI61919X0016).

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Authors and Affiliations

  1. St. Petersburg State University, 198504, St. Petersburg, Russia

    A. F. Kholtygin, I. A. Yakunin & M. S. Kurdoyakova

  2. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhny Arkhyz, Russia

    A. V. Moiseeva & I. A. Yakunin

  3. Sternberg Astronomical Institute, Moscow State University, 119991, Moscow, Russia

    M. A. Burlak

  4. Crimean Astrophysical Observatory RAS, 298409, Nauchny, Crimea, Russia

    E. B. Ryspaeva

  5. Main (Pulkovo) Astronomical Observatory RAS, 196140, St. Petersburg, Russia

    O. A. Tsiopa

Authors
  1. A. F. Kholtygin
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  2. A. V. Moiseeva
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  3. I. A. Yakunin
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  4. M. A. Burlak
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  5. E. B. Ryspaeva
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  6. O. A. Tsiopa
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  7. M. S. Kurdoyakova
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Correspondence to A. F. Kholtygin.

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Kholtygin, A.F., Moiseeva, A.V., Yakunin, I.A. et al. Superfast Stellar Pulsations from O to A Stars. Geomagn. Aeron. 62, 1136–1140 (2022). https://doi.org/10.1134/S0016793222080126

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  • DOI: https://doi.org/10.1134/S0016793222080126

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