Martin A. Guerrero, Xuan Fang, Marcelo Miguel Miller Bertolami, Gerardo Ramos-Larios, Helge Tobias Todt, Alexandre Alarie, Laurence Sabin, Luis F. Miranda, Christophe Morisset, Carolina Kehrig, Saul A. Zavala
- Planetary nebulae are ionized clouds of gas formed by the hydrogen-rich envelopes of low- and intermediate-mass stars ejected at late evolutionary stages. The strong UV flux from their central stars causes a highly stratified ionization structure, with species of higher ionization potential closer to the star. Here, we report on the exceptional case of HuBi 1, a double-shell planetary nebula whose inner shell presents emission from low-ionization species close to the star and emission from high-ionization species farther away. Spectral analysis demonstrates that the inner shell of HuBi 1 is excited by shocks, whereas its outer shell is recombining. The anomalous excitation of these shells can be traced to its low-temperature [WC10] central star whose optical brightness has declined continuously by 10 magnitudes in a period of 46 years. Evolutionary models reveal that this star is the descendant of a low-mass star (≃1.1 M⊙) that has experienced a ‘born-again’ event1 whose ejecta shock-excite the inner shell. HuBi 1 represents thePlanetary nebulae are ionized clouds of gas formed by the hydrogen-rich envelopes of low- and intermediate-mass stars ejected at late evolutionary stages. The strong UV flux from their central stars causes a highly stratified ionization structure, with species of higher ionization potential closer to the star. Here, we report on the exceptional case of HuBi 1, a double-shell planetary nebula whose inner shell presents emission from low-ionization species close to the star and emission from high-ionization species farther away. Spectral analysis demonstrates that the inner shell of HuBi 1 is excited by shocks, whereas its outer shell is recombining. The anomalous excitation of these shells can be traced to its low-temperature [WC10] central star whose optical brightness has declined continuously by 10 magnitudes in a period of 46 years. Evolutionary models reveal that this star is the descendant of a low-mass star (≃1.1 M⊙) that has experienced a ‘born-again’ event1 whose ejecta shock-excite the inner shell. HuBi 1 represents the missing link in the formation of metal-rich central stars of planetary nebulae from low-mass progenitors, offering unique insight regarding the future evolution of the born-again Sakurai’s object2. Coming from a solar-mass progenitor, HuBi 1 represents a potential end-state for our Sun.…
MetadatenAuthor details: | Martin A. GuerreroORCiD, Xuan FangORCiD, Marcelo Miguel Miller BertolamiORCiD, Gerardo Ramos-LariosORCiD, Helge Tobias TodtORCiD, Alexandre AlarieORCiD, Laurence SabinORCiD, Luis F. MirandaORCiD, Christophe MorissetORCiD, Carolina Kehrig, Saul A. Zavala |
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DOI: | https://doi.org/10.1038/s41550-018-0551-8 |
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ISSN: | 2397-3366 |
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Title of parent work (English): | Nature Astronomy |
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Publisher: | Nature Publ. Group |
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Place of publishing: | London |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2018/08/06 |
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Publication year: | 2018 |
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Release date: | 2021/09/21 |
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Tag: | Astronomy and astrophysics; Astronomy and planetary science; Interstellar medium; Stars; Stellar evolution |
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Volume: | 2 |
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Issue: | 10 |
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Number of pages: | 6 |
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First page: | 784 |
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Last Page: | 789 |
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Funding institution: | CONACyTConsejo Nacional de Ciencia y Tecnologia (CONACyT) [CONACyT-CB2015-254132, A1-S-12258]; Universidad de Guadalajara; Fundacion Marcos Moshinsky; ProMoFID2018; PAPIIT (Mexico)Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT) [IA-101316]; Ministerio de Economia, Industria y Competitividad (Spain) [AYA2014-57369-C3-3, AYA2017-84390-C2-1-R]; FEDER fundsEuropean Union (EU); ANPCyTANPCyT [PICT-2016-0053]; MinCyT-DAAD bilateral cooperation program [DA/16/07]; ITE-UNAM [1500-479-3-V-04]; [AYA 2014-57280-P] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access / Green Open-Access |
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