Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial velocity measurements of the pulsating zirconium star: LS IV -14
  116   The helium-rich hot subdwarf LS IV -14 116 shows remarkably high surface
abundances of zirconium, yttrium, strontium, and germanium, indicative of
strong chemical stratification in the photosphere. It also shows photometric
behaviour indicative of non-radial g-mode pulsations, despite having surface
properties inconsistent with any known pulsational instability zone. We have
conducted a search for radial velocity variability. This has demonstrated that
at least one photometric period is observable in several absorption lines as a
radial velocity variation with a semi-amplitude in excess of 5 km s$^{-1}$. A
correlation between line strength and pulsation amplitude provides evidence
that the photosphere pulsates differentially. The ratio of light to velocity
amplitude is too small to permit the largest amplitude oscillation to be
radial.

16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn