Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photometric study of new southern SU UMa-type dwarf novae - II:
  Authentication of BF Ara as a Normal SU UMa-type Dwarf Nova with the Shortest
  Supercycle   We photometrically observed the 2002 August long outburst of BF Ara. The
observation for the first time unambiguously detected superhumps (average
period 0.08797(1) d), qualifying BF Ara as a genuine SU UMa-type dwarf nova. An
analysis of the long-term visual light curve yielded a mean supercycle length
of 84.3(3) d. The characteristics of outbursts and superhumps more resemble
those of usual SU UMa-type dwarf novae rather than those of ER UMa stars. BF
Ara is thus confirmed to be the usual SU UMa-type dwarf nova with the shortest
known supercycle length. There still remains an unfilled gap of distributions
between ER UMa stars and usual SU UMa-type dwarf novae. We detected a zero
period change of the superhumps, which is quite unexpected from our previous
knowledge. This discovery implies that a previous interpretation requiring a
low M-dot would be no longer valid, or that a different mechanism is
responsible for BF Ara. We propose that the reduced (prograde) apsidal motion
of the eccentric disk by pressure forces may be responsible for the unusual
period change in BF Ara.

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The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
3
The categories of this paper are: physics
16
The categories of this paper are: stat
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg