Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The surface nitrogen abundance of a massive star in relation to its
  oscillations, rotation, and magnetic field   We have composed a sample of 68 massive stars in our galaxy whose projected
rotational velocity, effective temperature and gravity are available from
high-precision spectroscopic measurements. The additional seven observed
variables considered here are their surface nitrogen abundance, rotational
frequency, magnetic field strength, and the amplitude and frequency of their
dominant acoustic and gravity mode of oscillation. Multiple linear regression
to estimate the nitrogen abundance combined with principal components analysis,
after addressing the incomplete and truncated nature of the data, reveals that
the effective temperature and the frequency of the dominant acoustic
oscillation mode are the only two significant predictors for the nitrogen
abundance, while the projected rotational velocity and the rotational frequency
have no predictive power. The dominant gravity mode and the magnetic field
strength are correlated with the effective temperature but have no predictive
power for the nitrogen abundance. Our findings are completely based on
observations and their proper statistical treatment and call for a new strategy
in evaluating the outcome of stellar evolution computations.

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The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
19
The categories of this paper are: eess