The millimeter IRAM-30m line survey toward IK Tauri
| dc.contributor.author | VELILLA PRIETO, L., | |
| dc.contributor.author | SÁNCHEZ CONTRERAS, C., | |
| hal.structure.identifier | Instituto de Ciencia de Materiales de Madrid [ICMM] | |
| dc.contributor.author | CERNICHARO, J., | |
| dc.contributor.author | AGÚNDEZ, M., | |
| hal.structure.identifier | Instituto de RadioAstronomía Milimétrica [IRAM] | |
| dc.contributor.author | QUINTANA-LACACI, G., | |
| dc.contributor.author | BUJARRABAL, V., | |
| dc.contributor.author | ALCOLEA, J., | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | BALANÇA, Christian | |
| hal.structure.identifier | FORMATION STELLAIRE 2017 | |
| dc.contributor.author | HERPIN, Fabrice | |
| hal.structure.identifier | Max-Planck-Institut für Radioastronomie [MPIFR] | |
| dc.contributor.author | MENTEN, K. M., | |
| hal.structure.identifier | Max-Planck-Institut für Radioastronomie [MPIFR] | |
| dc.contributor.author | WYROWSKI, F., | |
| dc.date.issued | 2017 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | We carried out a millimeter wavelength line survey between 79 and 356 GHz with the IRAM-30m telescope to investigate the physical and chemical properties of the molecular envelope of the oxygen-rich AGB star IK Tau. We analysed the molecular lines detected using the population diagram technique to derive rotational temperatures and column densities. Additionally, we conducted a radiative transfer analysis of the SO$_2$ lines detected. For the first time in this source we detected rotational lines in the ground vibrational state of HCO$^+$, NS, NO, and H$_2$CO, as well as several isotopologues of molecules previously identified. We also detected several rotational lines in vibrationally excited states of SiS and SiO isotopologues, and rotational lines of H$_2$O ($\nu_{\mathrm{2}}$=2). We have also increased the number of rotational lines detected of molecules that were previously identified, enabling a detailed study of the molecular abundances and excitation temperatures. IK Tau displays a rich chemistry for an oxygen-rich circumstellar envelope. We highlight the detection of NS and H$_2$CO with fractional abundances of f(NS)$\sim$10$^{-8}$ and f(H$_2$CO)$\sim$[10$^{-7}$--10$^{-8}$]. Most of the molecules display rotational temperatures between 15 and 40 K. NaCl and SiS isotopologues display rotational temperatures higher than the average (~65 K). In the case of SO$_2$ a warm component with $T_{\mathrm{rot}}$$\sim$290 K is also detected. This SO$_2$ warm component is probably arising from the inner regions of the envelope (at $\sim$8$R_{*}$) where SO$_2$ has a fractional abundance of f(SO$_2$)$\sim$10$^{-6}$. This result should be considered for future investigation of the main formation channels of this, and other, parent species in the inner winds of O-rich AGB stars, which at present are not well reproduced by current chemistry models. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | Astrophysics - Solar and Stellar Astrophysics | |
| dc.subject.en | Astrophysics - Astrophysics of Galaxies | |
| dc.title.en | The millimeter IRAM-30m line survey toward IK Tauri | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201628776 | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA] | |
| dc.identifier.arxiv | 1609.01904 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | id.A25 | |
| bordeaux.volume | 597 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01366048 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01366048v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2017&rft.volume=597&rft.spage=id.A25&rft.epage=id.A25&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=VELILLA%20PRIETO,%20L.,&S%C3%81NCHEZ%20CONTRERAS,%20C.,&CERNICHARO,%20J.,&AG%C3%9ANDEZ,%20M.,&QUINTANA-LACACI,%20G.,&rft.genre=article |
Files in this item
| Files | Size | Format | View |
|---|---|---|---|
|
There are no files associated with this item. |
|||