EDP Sciences
Free access
Volume 508, Number 2, December III 2009
Page(s) 1067 - 1072
Section Atomic, molecular, and nuclear data
DOI http://dx.doi.org/10.1051/0004-6361/200913274
Published online 21 October 2009
A&A 508, 1067-1072 (2009)
DOI: 10.1051/0004-6361/200913274

Rotational spectroscopy of AlO

Low-N transitions of astronomical interest in the ${X}^{2}\Sigma^{+}$ state
O. Launila1 and D. P. K. Banerjee2

1  KTH AlbaNova University Center, Department of Applied Physics, 106 91 Stockholm, Sweden
    e-mail: olli@kth.se
2  Astronomy and Astrophysics Division, Physical Research Laboratory, Ahmedabad 380009, Gujarat, India
    e-mail: orion@prl.res.in

Received 9 September 2009 / Accepted 9 October 2009

Aims. The detection of rotational transitions of the AlO radical at millimeter wavelengths from an astronomical source has recently been reported. In view of this, rotational transitions in the ground ${X}^{2}\Sigma^{+}$ state of AlO have been reinvestigated.
Methods. Comparisons between Fourier transform and microwave data indicate a discrepancy regarding the derived value of $\gamma_{\rm D}$ in the v = 0 level of the ground state. This discrepancy is discussed in the light of comparisons between experimental data and synthesized rotational spectra in the v = 0, 1 and 2 levels of ${X}^{2}\Sigma^{+}$.
Results. A list of calculated rotational lines in v = 0, 1 and 2 of the ground state up to N' = 11 is presented which should aid astronomers in analysis and interpretation of observed AlO data and also facilitate future searches for this radical.

Key words: molecular data -- molecular processes -- ISM: molecules -- radio lines: stars

© ESO 2009