Abstract
We investigate the question of the possible variable conditions in dwarf novae. The Balmer decrements are used as variability indicators due to their form being strongly dependent on the conditions in the radiating medium. It is shown that the decrements are usually anomalous and variable in time at minimum light, which indicates a variability of the conditions in the radiating medium. The spectrum changes significantly during the outburst state, the decrement becomes steep and has no anomalies. It appears that the outburst makes the emitting region more homogeneous and sparse. Another possible explanation is that the radiation is emitted by some other region, unseen at minimum light.
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References
V. P. Grinin, Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii 62, 54 (1980).
T. Zwitter and U. Munari, Astron. and Astrophys. Suppl. 107, 504 (1994); 114, 575 (1995); 117, 449 (1996)
U. Munari and T. Zwitter, Astron. and Astrophys. Suppl. 128, 277 (1998).
U. Munari, T. Zwitter, and A. Bragaglia, Astron. and Astrophys. Suppl. 122, 495 (1997).
L. Morales-Rueda and T. R. Marsh, Monthly Notices Royal Astron. Soc. 332, 814 (2002).
H. A. Sheets, J. R. Thorstensen, C. J. Peters, et al., Publ. Astron. Soc. Pacific 119, 494 (2007).
G. Williams, Astrophys. J. Suppl. 53, 523 (1983).
I. G. Martinez-Pais, F. Giovannelli, C. Rossi, and S. Gaudenzi, Astron. and Astrophys. 291, 455 (1994).
N. F. Vojkhanskaya, Astrofizicheskie Issledovaniia 9, 16 (1977).
J. T. Clarke, S. Bowyer, and D. Capel, Astrophys. J. 287, 845 (1984).
J. T. Clarke and S. Bowyer, Astron. and Astrophys. 140, 345 (1984).
T. R. Marsh, Monthly Notices Royal Astron. Soc. 231, 1117 (1988).
R. Ishioka, S. Mineshige, T. Kato, et al., Publ. Astron. Soc. Japan 56, 481 (2004).
T. R. Marsh and K. Horne, Astrophys. J. 349, 593 (1990).
F. Piche and P. Szkody, Astron. J. 98, 2225 (1989).
L. Morales-Rueda, T. R. Marsh, and I. Billington, Monthly Notices Royal Astron. Soc. 313, 454 (2000).
F. V. Hessman, Astron. J. 98, 675 (1989).
R. Baptista, C. A. Haswell, and G. Thomas, Monthly Notices Royal Astron. Soc. 334, 198 (2002).
D. Steeghs, K. Horne, T. R. Marsh, and J. F. Donati, Monthly Notices Royal Astron. Soc. 281, 626 (1996).
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Original Russian Text © N.F. Vojkhanskaja, 2017, published in Astrofizicheskii Byulleten’, 2017, Vol. 72, No. 2, pp. 212–219.
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Vojkhanskaja, N.F. Balmer decrements in dwarf novae. Astrophys. Bull. 72, 191–198 (2017). https://doi.org/10.1134/S1990341317020109
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DOI: https://doi.org/10.1134/S1990341317020109