HR4049: Signature of nova nucleosynthesis?

M. Lugaro; O. Pols; A. I. Karakas; C. A. Tout

doi:10.1016/j.nuclphysa.2005.05.130

HR4049: Signature of nova nucleosynthesis?

M. Lugaro, O. Pols, A. I. Karakas, C. A. Tout

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Abstract

The post-Asymptotic Giant Branch (AGB) star HR4049 is in an eccentric binary system with a relatively short period probably surrounded by a dusty circumbinary disk. Extremely anomalous oxygen isotopic ratios, ¹⁶O/¹⁷O ≃ ¹⁶O/¹⁸O ≃ 7, have been measured from CO₂ molecules likely residing in the disk. Such a composition cannot be explained in the framework of AGB and post-AGB evolution while it can be qualitatively associated with the nucleosynthesis occurring during nova outbursts. We discuss nova models, the presence of a white dwarf companion to HR4049 and possible scenarios for the dynamical evolution of this binary system. Circumbinary disks in which mixing occurs between redgiant and nova material may also be invoked as the site of formation of some rare types of meteoritic presolar grains.

Original language	English
Pages (from-to)	725-728
Number of pages	4
Journal	Nuclear Physics A
Volume	758
Issue number	1-4 SPEC. ISS.
DOIs	https://doi.org/10.1016/j.nuclphysa.2005.05.130
Publication status	Published - 25 Jul 2005
Externally published	Yes

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10.1016/j.nuclphysa.2005.05.130

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title = "HR4049: Signature of nova nucleosynthesis?",

abstract = "The post-Asymptotic Giant Branch (AGB) star HR4049 is in an eccentric binary system with a relatively short period probably surrounded by a dusty circumbinary disk. Extremely anomalous oxygen isotopic ratios, 16O/17O ≃ 16O/18O ≃ 7, have been measured from CO2 molecules likely residing in the disk. Such a composition cannot be explained in the framework of AGB and post-AGB evolution while it can be qualitatively associated with the nucleosynthesis occurring during nova outbursts. We discuss nova models, the presence of a white dwarf companion to HR4049 and possible scenarios for the dynamical evolution of this binary system. Circumbinary disks in which mixing occurs between redgiant and nova material may also be invoked as the site of formation of some rare types of meteoritic presolar grains.",

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TY - JOUR

T1 - HR4049

T2 - Signature of nova nucleosynthesis?

AU - Lugaro, M.

AU - Pols, O.

AU - Karakas, A. I.

AU - Tout, C. A.

PY - 2005/7/25

Y1 - 2005/7/25

N2 - The post-Asymptotic Giant Branch (AGB) star HR4049 is in an eccentric binary system with a relatively short period probably surrounded by a dusty circumbinary disk. Extremely anomalous oxygen isotopic ratios, 16O/17O ≃ 16O/18O ≃ 7, have been measured from CO2 molecules likely residing in the disk. Such a composition cannot be explained in the framework of AGB and post-AGB evolution while it can be qualitatively associated with the nucleosynthesis occurring during nova outbursts. We discuss nova models, the presence of a white dwarf companion to HR4049 and possible scenarios for the dynamical evolution of this binary system. Circumbinary disks in which mixing occurs between redgiant and nova material may also be invoked as the site of formation of some rare types of meteoritic presolar grains.

AB - The post-Asymptotic Giant Branch (AGB) star HR4049 is in an eccentric binary system with a relatively short period probably surrounded by a dusty circumbinary disk. Extremely anomalous oxygen isotopic ratios, 16O/17O ≃ 16O/18O ≃ 7, have been measured from CO2 molecules likely residing in the disk. Such a composition cannot be explained in the framework of AGB and post-AGB evolution while it can be qualitatively associated with the nucleosynthesis occurring during nova outbursts. We discuss nova models, the presence of a white dwarf companion to HR4049 and possible scenarios for the dynamical evolution of this binary system. Circumbinary disks in which mixing occurs between redgiant and nova material may also be invoked as the site of formation of some rare types of meteoritic presolar grains.

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DO - 10.1016/j.nuclphysa.2005.05.130

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JO - Nuclear Physics A

JF - Nuclear Physics A

IS - 1-4 SPEC. ISS.

ER -

HR4049: Signature of nova nucleosynthesis?

Abstract

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