Magnetic field measurements in white dwarfs. Magnetic field, rotation and spectrum of 40 Eri B
| dc.creator | Fabrika, S. N. | |
| dc.creator | Valyavin, G. G. | |
| dc.creator | Burlakova, T. E. | |
| dc.creator | Barsukova, E. A. | |
| dc.creator | Monin, D. N. | |
| dc.date | 2000-06-04 | |
| dc.date.accessioned | 2026-07-07T01:53:51Z | |
| dc.date.available | 2026-07-07T01:53:51Z | |
| dc.description | This paper describes results of magnetic field measurements of white dwarfs carried out on the 6-m telescope for the last years. A magnetic field of about Be ~ 28 kG has been discovered in the degenerate star WD 1953-011. A rotational period of WD 0009+501, 1.83 hours, has been discovered, the average magnetic field of the star is <Be> = -42.3 +/- 5.4 kG and its semi-amplitude of the rotational variability is 32.0 +/- 6.8 kG. The variable magnetic field of the bright normal (non-magnetic) degenerate star 40 Eridani B was confirmed in January 1999 by Zeeman time-resolved spectroscopy. Both the Halpha and the Hbeta lines give about the same results, we have selected two best periods in the magnetic field variability, 2h25m and 5h17m. The semi-amplitude of the rotational variations B_ max ~ 4000-5000 G and the average field is about zero +/- 500 G. If the magnetic field of 40 Eridani B is a central dipole, then the rotational axis inclination to the line of sight is i ~ 90 DEG, and the magnetic axis inclination to the rotational axis is about the same, beta ~ 90 DEG. For the first time an ultra-high signal-to-noise spectrum of the white dwarf has been obtained (S/N > 1000). We have found in this hydrogen-rich DA white dwarf 40 Eridani B (16500 K) that helium abundance is low (N(He)/N(H) < 10^{-7}), but the spectrum is rich in ultra-weak absorption lines of metals in low ionization states. It was proposed that these lines were produced in both circumstellar and interstellar gas. | |
| dc.description | 11 pages, 12 figures, "Magnetic fields of chemically peculiar and related stars", eds. Yu. V. Glagolevskij and I.I. Romanyuk, Proceed. of Intern. Meeting, Moscow, 2000 (in press), p.219 | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0006050 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0006050 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/1120 | |
| dc.subject | Astrophysics | |
| dc.title | Magnetic field measurements in white dwarfs. Magnetic field, rotation and spectrum of 40 Eri B | |
| dc.type | text |