What question did this study set out to answer?

Characterize the kinematic motions, chemical compositions, and stellar populations across the Milky Way and its surrounding halo.

April 7, 2009The Astronomical JournalOpen Access

SEGUE: A SPECTROSCOPIC SURVEY OF 240,000 STARS WITHg= 14-20

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Characterize the kinematic motions, chemical compositions, and stellar populations across the Milky Way and its surrounding halo.
Obtained moderate-resolution (R ~ 1800, 3900–9000 Å) optical spectra for approximately 240,000 faint stars (14.0 < g < 20.3) across 212 sky regions.
Collected 3500 deg^2 of supplementary ugriz imaging to provide multicolor target selection and astrometry with ≈0.1 arcsec accuracy.
Attained radial velocity precision of σ(RV) ~ 4 km s^(−1) at g < 18, degrading to σ(RV) ~ 15 km s^(−1) at g ~ 20.
Derived stellar atmospheric parameters—including effective temperature, surface gravity, and metallicity—for all targets with signal-to-noise ratios > 10.
Achieved photometric precision of σ(g, r, i) ~ 2% and σ(u, z) ~ 3% across 3500 deg^2, releasing all catalogs in SDSS Data Release 7.

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Implication

Astronomical survey reveals radial velocities and atmospheric parameters in 240,000 Milky Way stars, highlighting galactic halo structure and kinematics.

Cite This Study

Yanny et al. (2009) studied this question.

synapsesocial.com/papers/6a0fc35f4fb650da4ffe7c3c https://doi.org/10.1088/0004-6256/137/5/4377

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Implication

Astronomical survey reveals radial velocities and atmospheric parameters in 240,000 Milky Way stars, highlighting galactic halo structure and kinematics.

SEGUE: A SPECTROSCOPIC SURVEY OF 240,000 STARS WITHg= 14-20

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Implication

Cite This Study

SEGUE: A SPECTROSCOPIC SURVEY OF 240,000 STARS WITHg= 14-20

Key Points

Discussion

Implication

Cite This Study

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