Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: AM CVn stars   I review our observational and theoretical knowledge of AM CVn stars,
focusing on recent developments. These include newly discovered systems, the
possibility that two recently discovered extremely short period objects are AM
CVn stars and an update on X-ray, UV an optical studies. Theoretical advances
include the study of the details of both the donor and accretor, and the
physics of the helium accretion discs. I review our (limited) knowledge of the
formation of AM CVn stars and the apparent success of the now more than 25 year
old suggestion that in these objects the mass transfer is driven by
gravitational wave radiation losses. The exciting prospect of directly
detecting these gravitational waves and the possibilities this brings conclude
this contribution.

19
The categories of this paper are: eess
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
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
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex