HIGH-RESOLUTION SPECTROSCOPY OF EXTREMELY METAL-POOR STARS IN THE LEAST EVOLVED GALAXIES: LEO IV

We present high-resolution Magellan/MIKE spectroscopy of the brightest star in the ultra-faint dwarf galaxy Leo IV. We measure an iron abundance of [Fe/H] = −3.2, adding to the rapidly growing sample of extremely metal-poor (EMP) stars being identified in Milky Way satellite galaxies. The star is enhanced in the α elements Mg, Ca, and Ti by ∼0.3 dex, very similar to the typical Milky Way halo abundance pattern. All of the light and iron-peak elements follow the trends established by EMP halo stars, but the neutron-capture elements Ba and Sr are significantly underabundant. These results are quite similar to those found for stars in the ultra-faint dwarfs Ursa Major II, Coma Berenices, Boötes I, and Hercules, suggesting that the chemical evolution of the lowest-luminosity galaxies may be universal. The abundance pattern we observe is consistent with predictions for nucleosynthesis from a Population III supernova explosion. The extremely low metallicity of this star also supports the idea that a significant fraction (≳10%) of the stars in the faintest dwarfs have metallicities below [Fe/H] = −3.0.

• Publication year

  2010

• Venue

  The Astrophysical Journal

• Publication date

  2010-01-19

• Fields of study

  Physics

• Identifiers
  DOI 10.1088/0004-637X/716/1/446arXiv 1001.3137
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• The observed abundance pattern is consistent with nucleosynthesis from a Population III supernova explosion.

  Confidence 0.88

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• The light and iron-peak elements follow the trends of EMP halo stars, while barium and strontium are significantly underabundant.

  Confidence 0.95

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• Magnesium, calcium, and titanium are enhanced by about 0.3 dex, closely matching the typical abundance pattern seen in Milky Way halo stars.

  Confidence 0.95

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• The brightest star in Leo IV has an iron abundance of [Fe/H] = -3.2, placing it in the extremely metal-poor regime.

  Confidence 0.99

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review

• alpha elements

  element group

  A group of elements that includes magnesium, calcium, and titanium in the abundance discussion of the target star.

  Aliases: alpha-element group, alpha-element abundances

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• extremely metal-poor (emp) star

  stellar classification

  A star with very low heavy-element content, used here to classify the observed target and compare it with halo-star samples.

  Aliases: EMP star, EMP stars

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• iron abundance [fe/h]

  measurement, abundance

  A logarithmic measure of a star's iron content relative to hydrogen compared with the Sun.

  Aliases: [Fe/H], metallicity

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• iron-peak elements

  element group

  Elements around the iron peak whose abundance trends are compared against EMP halo-star patterns.

  Aliases: iron peak elements

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• leo iv

  astronomical object

  An ultra-faint dwarf galaxy in which the target star was observed.

  Aliases: Leo 4

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• light elements

  element group

  The lighter chemical elements whose abundance trends are compared with those of EMP halo stars.

  Aliases: light-element abundances

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• milky way halo

  astronomical structure

  The extended stellar component of the Milky Way used as the comparison population for abundance patterns.

  Aliases: Galactic halo, halo stars

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• neutron-capture elements

  element group

  Heavy elements such as barium and strontium that are produced by neutron-capture processes.

  Aliases: n-capture elements, heavy neutron-capture elements

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review
• population iii supernova

  astrophysical event

  A supernova from a first-generation, metal-free stellar progenitor used here as the nucleosynthesis reference.

  Aliases: Pop III supernova, Population III SN

  박진우 (dztg5apj7m) extraction뀨 (7c402c1b98) reviewB (s683577b42) reviewKiller Whale (322360f1c1) review

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