Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The radio continuum spectrum of Mira A and Mira B up to submillimeter
  wavelengths   We present new measurements of the flux densities at submillimeter
wavelengths based on ALMA band 7 (338 GHz) and band 9 (679 GHz) observations to
better constrain the origin of the continuum emission of the Mira AB binary
system and to check its orbit. We have measured the Mira A and Mira B continuum
in ALMA band 7, with a resolution of ~0"31, and for the first time in ALMA band
9, with a resolution of ~0"18. We resolved the binary system at both bands, and
derived the continuum spectral index of the stars and their relative position.
We also analyzed ALMA SciVer data obtained in bands 6 and 3. Measurements at
centimeter wavelengths obtained by other authors have been included in our
study of the spectral energy distribution of the Mira components. The Mira A
continuum emission has a spectral index of 1.98+-0.04 extending from
submillimeter down to centimeter wavelengths. The spectral index of the Mira B
continuum emission is 1.93+-0.06 at wavelengths ranging from submillimeter to
~3.1 mm, and a shallower spectral index of 1.22+-0.09 at longer wavelengths.
The Mira A continuum emission up to submillimeter wavelengths is consistent
with that of a radio photosphere surrounding the evolved star for which models
predict a spectral index close to 2. The Mira B continuum emission cannot be
described with a single ionized component. An extremely compact and dense
region around the star can produce the nearly thermal continuum measured in the
0.4-3.1 mm wavelength range, and an inhomogeneous, less dense, and slightly
larger ionized envelope could be responsible for the emission at longer
wavelengths. Our results illustrate the potential of ALMA for high precision
astrometry of binary systems. We have found a significant discrepancy of ~14
milliarcsec between the ALMA measurements and the predicted orbit positions.

5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin