Lambda Boötis star

A Lambda Boötis star is a type of peculiar star which has an unusually low abundance of iron peak elements in its surface layers. One possible explanation for this is that it is the result of accretion of metal-poor gas from a circumstellar disc, a second possibility is the accretion of material from a hot Jupiter suffering from mass loss. The prototype is Lambda Boötis.^[1]

References

↑ Jura, M. (2015). "Lambda Boo Abundance Patterns: Accretion from Orbiting Sources". The Astronomical Journal. 150 (6). 166. arXiv:1509.04672. Bibcode:2015AJ....150..166J. doi:10.1088/0004-6256/150/6/166.

Paunzen, Ernst (2004). "The λ Bootis stars". In Zverko, J.; Ziznovsky, J.; Adelman, S.J.; Weiss, W.W. The A-Star Puzzle. IAU Symposium, No. 224. ISBN 0521850185. Retrieved 2008-11-16.
Gray, R.O.; Corbally, C.J. (2002). "A Spectroscopic Search for λ Bootis and Other Peculiar A-Type Stars in Intermediate-Age Open Clusters". The Astronomical Journal. 124 (2): 989–1000. Bibcode:2002AJ....124..989G. doi:10.1086/341609.

Star
Formation	Accretion Molecular cloud Bok globule Young stellar object Protostar Pre-main-sequence star Herbig Ae/Be Orion T Tauri FU Orionis Herbig–Haro object Hayashi track Henyey track
Evolution	Main sequence Red-giant branch Horizontal branch Red clump Asymptotic giant branch Protoplanetary nebula Planetary nebula PG1159 star Dredge-up Instability strip Luminous blue variable Blue straggler Stellar population Supernova Supernova impostor Hypernova Hertzsprung–Russell diagram Color–color diagram
Luminosity class	Subdwarf Dwarf Blue Red White Yellow Brown Subgiant Giant Blue Red Yellow Bright giant Supergiant Blue Red Yellow Hypergiant Yellow
Spectral classification	O B A F G K M WR Be OB Subdwarf O Subdwarf B Late-type Chemically peculiar Am Ap/Bp Oscillating Barium Carbon CH CN Extreme helium Lambda Boötis Lead HgMn S Technetium Shell
Remnants	White dwarf Helium planet Neutron star Radio-quiet Pulsar Binary X-ray Magnetar Stellar black hole X-ray binary Burster
Hypothetical stars	Boson star Black dwarf Exotic Electroweak star Quark Strange Preon Planck Dark matter star Dark-energy star Black star Gravastar Frozen star Q star Quasi-star Thorne–Żytkow object Iron star Blitzar
Nucleosynthesis	Deuterium burning Lithium burning Proton–proton chain CNO cycle Helium flash Triple-alpha process Alpha process Carbon burning Neon burning Oxygen burning Silicon burning S-process R-process Fusor Nova Symbiotic Remnant Luminous red nova
Structure	Core Convection zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Corona Stellar wind Bubble Bipolar outflow Accretion disk Asteroseismology Helioseismology Eddington luminosity Kelvin–Helmholtz mechanism
Properties	Designation Dynamics Effective temperature Kinematics Magnetic field Absolute magnitude Mass Metallicity Rotation UBV color Variable star Mira variable
Star systems	Binary Contact Common envelope Eclipsing Symbiotic Multiple Star cluster Open cluster Globular cluster Super star cluster Planetary system Earth's Solar System
Earth-centric observation of	Pole star Circumpolar star Constellation Asterism Magnitude Apparent Extinction Photographic Radial velocity Proper motion Parallax Photometric-standard star
Lists	Star names Arabic Chinese Extremes Most massive Highest temperature Largest volume Smallest volume Brightest Historical Most luminous Nearest Nearest bright Stars with exoplanets Brown dwarfs White dwarfs Milky Way novae Notable supernovae Supernova candidates Supernova remnants Planetary nebulae Timeline of stellar astronomy
Related articles	Substellar object Brown dwarf Sub-brown dwarf Planet Galactic year Galaxy Supercluster Guest star Gravity Icarus (most distant individual star) Intergalactic star Infrared dark cloud Starfield
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