Abstract
The formation of hydrogen emission lines in the magnetospheres of young stars is considered. The magnetosphere is assumed to be formed by a dipolar magnetic field whose axis is aligned with the stellar rotation axis. The radiative transfer in spectral lines is considered in the Sobolev approximation by taking into account the nonlocal radiative coupling. The gas density and temperature distributions in the magnetosphere are taken to be the same as those in Hartmann et al. (1994). The results of our calculations of the Hα and Hβ line intensities and profiles are presented for the case of a slowly rotating star. We separately consider the magnetospheric models in which the infalling gas is heated by radiation from an accretion spot on the stellar surface and the case where the axis of the magnetosphere is tilted with respect to the stellar rotation axis. Rotational modulation of the spectral line profiles with the stellar rotation period is observed in the latter case.
Similar content being viewed by others
References
S. H. P. Alencar, P. S. Teixeira, M. M. Guimaraes, T. P. McGinnis, J. F. Gameiro, J. Bouvier, S. Aigrain, E. Flaccomio, and F. Favata, Astron. Astrophys. 519, A88 (2010).
J. Bouvier, A. Chelli, S. Allain, L. Carrasco, R. Costero, I. Cruz-Gonzalez, C. Dougados, M. Fernández, et al., Astron. Astrophys. 349, 619 (1999).
J. Bouvier, S. H. P. Alencar, T. Boutelier, C. Dougados, Z. Balog, K. Grankin, S. T. Hodgkin, M. A. Ibrahimov, et al., Astron. Astrophys. 463, 1017 (2007).
A. Dodin, Mon. Not. R. Astron. Soc. 475, 4367 (2018).
C. F. Esau, T. J. Harries, and J. Bouvier, Mon. Not. R. Astron. Soc. 443, 1022 (2014).
S. I. Grachev and V. P. Grinin, Astrofizika 11, 20 (1975).
V. P. Grinin and N. A. Katysheva, Izv. KrAO 62, 52 (1980).
V. P. Grinin and L. V. Tambovtseva, Astron. Rep. 55, 704 (2011).
L. Hartmann, R. Hewett, and N. Calvet, Astrophys. J. 426, 669 (1994).
J. Humlicek, J. Quant. Spectrosc. Radiat. Transfer 27, 437 (1982).
C. M. Johns and G. Basri, Astrophys. J. 449, 341 (1995).
C. M. Johns-Krull, J. A. Valenti, A. P. Hatzes, and A. Kanaan, Astrophys. J. 510, L41 (1999).
R. Kurosawa, M. M. Romanova, and T. J. Harries, Mon. Not. R. Astron. Soc. 385, 1931 (2008).
S. A. Lamzin, Astron. Rep. 42, 439 (1998).
G. H. R. A. Lima, S. H. P. Alencar, N. Calvet, L. Hartmann, and J. Muzerolle, Astron. Astrophys. 522, A104 (2010).
D. G. Luttermoser and H. R. Johnson, Astrophys. J. 388, 579 (1992).
S. Matt and R. E. Pudritz, Astrophys. J. 632, L135 (2005).
P. T. McGinnis, S. H. P. Alencar, M. M. Guimarges, A. P. Sousa, J. Stauffer, J. Bouvier, L. Rebull, N. N. Fonseca, et al., Astron. Astrophys. 577, A11 (2015).
J. Muzerolle, N. Calvet, and L. Hartmann, Astrophys. J. 550, 944 (2001).
P. P. Petrov, Astrofizika 46, 506 (2003).
P. P. Petrov, G. F. Gahm, J. F. Gameiro, R. Duemmler, I. V. Ilyin, T. Laakkonen, M. Lago, and I. Tuominen, Astron. Astrophys. 369, 993 (2001).
G. B. Rybicki and D. G. Hummer, Astrophys. J. 219, 654 (1978).
V. V. Sobolev, Moving Envelopes of Stars (Leningr. Gos. Univ., Leningrad, 1947; Harvard Univ. Press, Cambridge, 1960).
V. V. Sobolev, Astron. Zh. 34, 694 (1957).
L. V. Tambovtseva and V. P. Grinin, Astron. Astrophys. 562, A104 (2014).
Author information
Authors and Affiliations
Corresponding author
Additional information
Funding
This work was supported by Program P12 of the Russian Academy of Sciences “Questions of the Origin and Evolution of the Universe.”
Rights and permissions
About this article
Cite this article
Dmitriev, D.V., Grinin, V.P. & Katysheva, N.A. Formation of Hydrogen Emission Lines in the Magnetospheres of Young Stars. Astron. Lett. 45, 371–383 (2019). https://doi.org/10.1134/S1063773719050013
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063773719050013