A nature of the X-ray and optical emission from gamma Cassiopeia stars

Kholtygin A.; Yakunin I.; Ryspaeva E.; Mokshin D.

doi:doi:10.26119/VAK2024.063

Home / Conferences / Modern astronomy: from the Early Universe to exoplanets and black holes / Modern astronomy: from the Early Universe to exoplanets and black holes Volume 1

A nature of the X-ray and optical emission from gamma Cassiopeia stars

Submit manuscript Download PDF
Text

To cite

A NATURE OF THE X-RAY AND OPTICAL EMISSION FROM GAMMA CASSIOPEIA STARS

Section: STARS AND THE INTERSTELLAR MEDIUM

Proceedings: MODERN ASTRONOMY: FROM THE EARLY UNIVERSE TO EXOPLANETS AND BLACK HOLES Volume 1

UDC 52 UDC 524.33 UDC 53 UDC 520 UDC 521 UDC 523 UDC 524 UDC 52-1 UDC 52-6

CSCSTI 41.00 CSCSTI 29.35 CSCSTI 29.31 CSCSTI 29.33 CSCSTI 29.27 CSCSTI 29.05

Russian Classification of Professions by Education 03.06.01 Russian Classification of Professions by Education 03.05.01 Russian Classification of Professions by Education 03.04.03

Russian Library and Bibliographic Classification 2 Russian Library and Bibliographic Classification 223

Russian Trade and Bibliographic Classification 614 Russian Trade and Bibliographic Classification 6135

BISAC SCI004000 Astronomy BISAC SCI005000 Physics / Astrophysics

Kholtygin A. ¹

Yakunin I. ²

Ryspaeva E. ³

Mokshin D. ⁴

Author and publication information

Authors:

1. Saint-Petersburg University

2. Special Astrophysical Observatory of the Russian Academy of Sciences

3. Saint-Petersburg University
Crimean Astrophysical Observatory of the Russian Academy of Sciences

4. Saint-Petersburg University

Type:

Сonference article

DOI:

https://doi.org/10.26119/VAK2024.063

EDN:

https://elibrary.ru/njzvce

Published:

27.12.2024

Subject area:

UDC 52
UDC 524.33
UDC 53
UDC 520
UDC 521
UDC 523
UDC 524
UDC 52-1
UDC 52-6
CSCSTI 41.00
CSCSTI 29.35
CSCSTI 29.31
CSCSTI 29.33
CSCSTI 29.27
CSCSTI 29.05
Russian Classification of Professions by Education 03.06.01
Russian Classification of Professions by Education 03.05.01
Russian Classification of Professions by Education 03.04.03
Russian Library and Bibliographic Classification 2
Russian Library and Bibliographic Classification 223
Russian Trade and Bibliographic Classification 614
Russian Trade and Bibliographic Classification 6135
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics

Language:

English

Keywords:

stars: general, emission-line, Be; X-rays: stars

Abstract and keywords

Abstract (English):
To test the origin of the X-ray and optical emission from the

γ

Cas-type stars, we analyzed their optical spectra obtained on the 6-m telescope BTA, the 1.25-m telescope of the Crimean station of the State Astronomical Institute (SAI, Moscow), the 2.5-m telescope SAI25 of SAI, and the photometric TESS light curves. We compare the optical variability of the

γ

Cas-type stars with variations of their X-ray luminosity. An overlap between the periods of line profile variations in the spectra of

γ

Cas stars and the variations in their X-ray brightness allows us to assume that a significant fraction of X-rays emits from the same place where the optical radiation comes from. The

γ

Cas-type stars HD 45314, HD 45995 and NGC 6649 9 demonstrate the ultrafast X-ray brightness variations with the periods of about 50–90 seconds, which may be the rotation periods of white dwarfs components of binary systems. Thus, we can assume that at least for these stars the X-ray emission goes partly due to accretion onto rapidly rotating white dwarfs. The anomalously hard X-ray emission from the

γ

Cas stars can be interpreted by assuming that the contribution of non-thermal X-ray emission is generated as a result of a reconnection of the local magnetic field lines of the Be star and its decretion disk.

Keywords:
stars: general, emission-line, Be; X-rays: stars

Text

Text (PDF): Read Download

References

1. Afanasiev V.L. and Moiseev A.V., 2005, Astronomy Letters, 31, 3, p. 194

2. Delgado A.J. and Thomas H.-C. 1981, Astronomy & Astrophysics, 96, 1-2, p. 142

3. Dewi J.D.M., Pols O.R., Savonije G.J., et al., 2002, Monthly Notices Royal Astronomical Society, 331, 4, p. 1027

4. Gies D.R., Wang L., Klement R., 2023, Astrophysical Journal Letters, 942, 1, id. L6

5. Ikonnikova N.P., Shaposhnikov I.A., Esipov V.F., et al., 2021, Astronomy Letters, 47, 8. p. 560

6. Kholtygin A.F., Moiseeva A.V., Yakunin I.A., et al., 2021a, Geomagnetism and Aeronomy, 61, p. 923

7. Kholtygin A.F., Burlak, M.A., Tsiopa, O.A., 2021b, Astronomicheskij Tsirkulyar, 1649, p. 1

8. Kholtygin A.F., Ryspaeva E.B., Moiseeva A., et al., 2022a, The Multifaceted Universe: Theory and Observations-2022, id. 44

9. Kholtygin A.F., Moiseeva A.V., Yakunin I.A., et al., 2022b, Geomagnetism and Aeronomy, 62, p. 1136

10. Kholtygin A., Burlak M., Milanova Y., 2022c, Astronomicheskij Tsirkulyar, 1652, p. 1

11. Kholtygin A.F., Ryspaeva E.B., Yakunin I.A., et al., 2023a, INASAN Science Reports, 8, 2, p. 86

12. Kholtygin A.F., Yakunin I.A., Burlak M.A., et al., 2023b, Astrophysical Bulletin, 78, 4, p. 557

13. Laplace E., Götberg Y., de Mink S.E., et al., 2020, Astronomy & Astrophysics, 637, id. A6

14. Nazé Y., Motch C., Rauw G., et al., 2020, Monthly Notices Royal Astronomical Society, 493, 2, p. 2511

15. Nazé Y., Rauw G., Smith M.A., et al., 2022, Monthly Notices Royal Astronomical Society, 516, 3, p. 3366

16. Panchuk V.E., Chuntonov G.A., Naidenov I.D., 2014, Astrophysical Bulletin, 69, 3, p. 339

17. Pols O.R., Cote J., Waters L.B.F.M., et al., 1991, Astronomy & Astrophysics, 241, p. 419

18. Postnov K., Oskinova L., Torrejón J.M., 2017, Monthly Notices Royal Astronomical Society, 465, 1, p. L119

19. Potanin S.A., Belinski, A.A., Dodin A.V., et al., 2020, Astronomy Letters, 46, 12, p. 836

20. Rivinius T., Carciofi A.C., Martayan C. 2013, Astronomy and Astrophysics Review, 21, id. 69

21. Ruždjak,D., Božić H., Harmanec P., et al., 2009, Astronomy & Astrophysics, 506, 3, p. 1319

22. Ryspaeva E.B. and Kholtygin A.F., 2021, Open Astronomy, 30, 1, p. 132

23. Smith M.A., Lopes de Oliveira R., Motch C., 2012, Astrophysical Journal, 755, 1, id. 64

24. Smith M.A., Lopes de Oliveira R., Motch C., 2017, Monthly Notices Royal Astronomical Society, 469, 2, p. 1502

25. Smith R.K., Brickhouse N.S., Liedahl D.A. et al., 2001, Astrophysical Journal, 556, 2, p. L91

Submit manuscript Download PDF
Text

To cite

Citations:

Confirmation

Регистрация