Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sulfur, Chlorine, and Argon in Planetary Nebulae. IIA: Observations of a
  Southern Sample   In this paper we present fully reduced and dereddened emission line strengths
for a sample of 45 southern Type II planetary nebulae (PNe). The
spectrophotometry for these PNe covers an extended optical/near-IR range from
3600 - 9600 Angstroms. This PN study and subsequent analysis (presented in a
companion paper), together with a similar treatment for a northern PN sample,
is aimed at addressing the lack of homogeneous, consistently observed, reduced,
and analyzed data sets that include the near-IR [S III] lines at 9069 and 9532
Angstroms. The use of Type II objects only is intended to select disk nebulae
that are uncontaminated by nucleosynthetic products of the progenitor star.
Extending spectra redward to include the strong [S III] lines enables us to
look for consistency between S++ abundances inferred from these lines and from
the more accessible, albeit weaker, [S III] line at 6312 Angstroms.

37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
26
The categories of this paper are: bayes-an