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| Paper: |
SMA Spectral Line Imaging Survey at 279 – 355 GHz of the
Oxygen-rich AGB Star IK Tau |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
73 |
| Authors: |
De Beck, E.; Kamiński, T.; Menten, K. M.; Patel, N. A.; Young, K. H.; Gottlieb, C. A. |
| Abstract: |
Dedicated, unbiased spectral scans of asymptotic giant branch stars have
so far been published only for a few carbon-rich stars, with a strong
focus on the nearby and bright IRC +10216. We present results from a
spectral survey of the circumstellar envelope of the oxygen-rich AGB
star IK Tau obtained with the Submillimeter Array (SMA) at ~
0'.9 angular resolution in the frequency range 279–355 GHz,
expanding the molecular inventory for M-type evolved stars and filling
an observational gap. The survey shows over 140 emission lines, belonging
to more than 30 species. The emission of AlO and of several vibrationally
excited species traces the acceleration of the wind. Isotopic ratios for
carbon, silicon, and sulfur will be derived from the observed emission
of isotopologues of CO, SiO, SiS, HCN, SO, and SO2. This will allow
us to constrain the AGB nucleosynthesis of IK Tau. We highlight the
first detection of PO and PN around an oxygen-rich AGB star, detected
at unexpectedly high abundances, and emphasise the importance of unbiased
spectral surveys of AGB stars and the need for updated chemical models. |
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