Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chemical abundances of planetary nebulae in the disk-bulge connection   We report the spectrophotometric investigation of a planetary nebula sample
located at the disk-bulge interface of the Milky Way. The main goal of this
work was to determine the galactocentric distance where, according to the
intermediate mass population, bulge and disk properties separate. In order to
derive such distance, new abundances were derived for a sample of PN located at
this region, and the results were combined with additional data from the
literature. The abundance analysis indicates a chemical abundance distribution
similar to that derived from bulge stars, as already pointed out by other
authors.
  Statistical distance scales were then used to study the distribution of
chemical abundances across the disk-bulge connection. A Kolmogorov-Smirnov test
was used to find the distance in which the chemical properties of these regions
better separate, resulting in a best value of 2.9 kpc to define the inner limit
of the disk.

5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci
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
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex