Universität zu Köln

Makarenko, Ekaterina, I, Igoshev, Andrei P. and Kholtygin, A. F. (2021). Testing the fossil field hypothesis: could strongly magnetized OB stars produce all known magnetars? Mon. Not. Roy. Astron. Soc., 504 (4). S. 5813 - 5829. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

Stars of spectral types O and B produce neutron stars (NSs) after supernova explosions. Most of NSs are strongly magnetized including normal radio pulsars with B proportional to 10(12) G and magnetars with B proportional to 10(14) G. A fraction of 7-12 per cent of massive stars are also magnetized with B proportional to 10(3) G and some are weakly magnetized with B proportional to 1 G. It was suggested that magnetic fields of NSs could be the fossil remnants of magnetic fields of their progenitors. This work is dedicated to study this hypothesis. First, we gather all modern precise measurements of surface magnetic fields in O, B, and A stars. Secondly, we estimate parameters for lognormal distribution of magnetic fields in B stars and found mu(B) = 2.83 +/- 0.1 log(10) (G), sigma(B) = 0.65 +/- 0.09 for strongly magnetized and mu(B) = 0.14 +/- 0.5 log(10) (G), s = 0.7(-0.27)(+0.57) for weakly magnetized. Third, we assume that the magnetic field of pulsars and magnetars have 2.7-dex difference in magnetic fields and magnetars represent 10 per cent of all young NSs and run population synthesis. We found that it is impossible to simultaneously reproduce pulsars and magnetars populations if the difference in their magnetic fields is 2.7 dex. Therefore, we conclude that the simple fossil origin of the magnetic field is not viable for NSs.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Makarenko, Ekaterina, I UNSPECIFIED UNSPECIFIED UNSPECIFIED Igoshev, Andrei P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kholtygin, A. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-588913
DOI:	10.1093/mnras/stab1175
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	504
Number:	4
Page Range:	S. 5813 - 5829
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ISOLATED NEUTRON-STARS; B-TYPE STARS; OBLIQUE ROTATOR MODEL; DELTA-SCUTI STAR; AP STARS; SPECTRAL VARIABILITY; POPULATION SYNTHESIS; STELLAR EVOLUTION; RADIO-PULSARS; MASSIVE STARS Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58891