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
BISAK SCI004000 Astronomy
BISAK SCI005000 Physics / Astrophysics
Studies of magnetic white dwarfs in the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) have been carried out since 1990 with the 6-m telescope using various spectrographs and with the 1-m Zeiss-1000 telescope using the Multi-Mode Photometer-Polarimeter (MMPP). As a result, we have derived direct estimates of the longitudinal magnetic field obtained with spectropolarimetric observations and circular polarization values in the photometric mode. We observed both well-known magnetic white dwarfs and objects with no data about magnetic field. Among well-known magnetic objects, there were white dwarfs with an extremely strong magnetic field of up to hundreds megagauss and weak magnetic white dwarfs with a field of several tens kilogauss. The use of these data and the data obtained by other authors allowed time series of the observations of these objects to be several decades. Analyzing these time series, we estimated the lower limits of the evolution times of the magnetic fields of white dwarfs.
stars: white dwarfs, magnetic field, evolution
1. Aitov V.N., Valyavin G.G., Valeev A.F., et al., 2022, Astrophysical Bulletin, 77, 3, p. 301
2. Bagnulo S. and Landstreet J.D., 2021, Monthly Notices of the Royal Astronomical Society, 507, 4, p. 5902
3. Fabrika S.N., Shtol' V.G., Valyavin G.G., 1997, Astronomy Letters, 23, 1, p. 43
4. Fabrika S. and Valyavin G., 1999, ASP Conf. Ser., 169, p. 214
5. Holberg J.B., Oswalt T.D., Sion E.M., et al., 2016, Monthly Notices of the Royal Astronomical Society, 462, 3, p. 2295
6. Kepler S.O., Pelisoli I., Jordan S., et al., 2013, Monthly Notices of the Royal Astronomical Society, 429, 4, p. 2934
7. Landstreet J.D., Bagnulo S., Valyavin G.G., et al., 2012, Astronomy & Astrophysics, 545, id. A30
8. Landstreet J.D., Bagnulo S., Martin A., et al., 2016, Astronomy & Astrophysics, 591, id. A80
9. Landstreet J.D., Bagnulo S., Valyavin G.G., et al., 2017, Astronomy & Astrophysics, 607, id. A92
10. Valyavin G., Bagnulo S., Monin D., et al., 2005, Astronomy & Astrophysics, 439, 3, p. 1099
11. Valyavin G., Bagnulo S., Fabrika S., et al., 2006, Astrophysical Journal, 648, 1, p. 559
12. Valyavin G., Wade G.A., Bagnulo S., et al., 2008, Astrophysical Journal, 683, 1, p. 466
13. Valyavin G., Shulyak D., Wade G.A., et al., 2014, Nature, 515, 7525, p. 88
14. Wendell C.E., van Horn H.M., Sargent D., 1987, Astrophysical Journal, 313, p. 284
