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Title: LAMBDA BOO ABUNDANCE PATTERNS: ACCRETION FROM ORBITING SOURCES

The abundance anomalies in λ Boo stars are popularly explained by element-specific mass inflows at rates that are much greater than empirically inferred bounds for interstellar accretion. Therefore, a λ Boo star’s thin outer envelope must derive from a companion star, planet, analogs to Kuiper Belt objects or a circumstellar disk. Because radiation pressure on gas-phase ions might selectively allow the accretion of carbon, nitrogen, and oxygen and inhibit the inflow of elements such as iron, the source of the acquired matter need not contain dust. We propose that at least some λ Boo stars accrete from the winds of hot Jupiters.
Authors:
 [1]
  1. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1562 (United States)
Publication Date:
OSTI Identifier:
22520089
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (Online); Journal Volume: 150; Journal Issue: 6; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON; COSMIC DUST; ELEMENT ABUNDANCE; INTERSTELLAR SPACE; IRON; MASS; NITROGEN; OXYGEN; RADIATION PRESSURE; STAR ACCRETION; STARS; STELLAR WINDS