Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of magnetic fields in stars across the upper main sequence: I.
  Catalogue of magnetic field measurements with FORS1 at the VLT   To properly understand the physics of Ap and Bp stars it is particularly
important to identify the origin of their magnetic fields. For that, an
accurate knowledge of the evolutionary state of stars that have a measured
magnetic field is an important diagnostic. Previous results based on a small
and possibly biased sample suggest that the distribution of magnetic stars with
mass below 3 M_sun in the H-R diagram differs from that of normal stars in the
same mass range (Hubrig et al. 2000). In contrast, higher mass magnetic Bp
stars may well occupy the whole main-sequence width (Hubrig, Schoeller & North
2005). In order to rediscuss the evolutionary state of upper main sequence
magnetic stars, we define a larger and bias-free sample of Ap and Bp stars with
accurate Hipparcos parallaxes and reliably determined longitudinal magnetic
fields. We used FORS1 at the VLT in its spectropolarimetric mode to measure the
magnetic field in chemically peculiar stars where it was unknown or poorly
known as yet. In this first paper we present our results of the mean
longitudinal magnetic field measurements in 136 stars. Our sample consists of
105 Ap and Bp stars, two PGa stars, 17 HgMn stars, three normal stars, and nine
SPB stars. A magnetic field was for the first time detected in 57 Ap and Bp
stars, in four HgMn stars, one PGa star, one normal B-type star and four SPB
stars.

27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin