EXPANDING the CATALOG: CONSIDERING the IMPORTANCE of CARBON, MAGNESIUM, and NEON in the EVOLUTION of STARS and HABITABLE ZONES

Amanda Truitt, Patrick Young

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Building on previous work, we have expanded our catalog of evolutionary models for stars with variable composition; here we present models for stars of mass 0.5-1.2 M o, at scaled metallicities of 0.1-1.5 Z o, and specific C/Fe, Mg/Fe, and Ne/Fe values of 0.58-1.72 C/Feo, 0.54-1.84 Mg/Feo, and 0.5-2.0 Ne/Feo, respectively. We include a spread in abundance values for carbon and magnesium based on observations of their variability in nearby stars; we choose an arbitrary spread in neon abundance values commensurate with the range seen in other low Z elements due to the difficult nature of obtaining precise measurements of neon abundances in stars. As indicated by the results of Truitt et al., it is essential that we understand how differences in individual elemental abundances, and not just the total scaled metallicity, can measurably impact a star's evolutionary lifetime and other physical characteristics. In that work, we found that oxygen abundances significantly impacted the stellar evolution; carbon, magnesium, and neon are potentially important elements to individually consider due to their relatively high (but also variable) abundances in stars. We present 528 new stellar main-sequence models, and we calculate the time-dependent evolution of the associated habitable zone boundaries for each based on mass, temperature, and luminosity. We also reintroduce the 2 Gyr "Continuously Habitable Zone" (CHZ2) as a useful tool to help gauge the habitability potential for a given planetary system.

Original languageEnglish (US)
Article number87
JournalAstrophysical Journal
Volume835
Issue number1
DOIs
StatePublished - Jan 20 2017

Keywords

  • astrobiology
  • astronomical databases: miscellaneous
  • catalogs
  • planetary systems
  • stars: abundances
  • stars: evolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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