SEGUE-2: Old Milky Way Stars Near and Far
Abstract
The Sloan Extension for Galactic Understanding and Exploration 2 (SEGUE-2) obtained 128,288 low-resolution spectra (R ~ 1800) of 118,958 unique stars in the first year of the Sloan Digital Sky Survey III (2008–2009). SEGUE-2 targeted prioritized distant halo tracers (blue horizontal-branch stars, K giants, and M giants) and metal-poor or kinematically hot populations. The main goal of SEGUE-2 was to target stars in the distant halo and measure their kinematics and chemical abundances to learn about the formation and evolution of the Milky Way. We present the SEGUE-2 field placement and target selection strategies. We discuss the success rate of the targeting based on the SEGUE-2 spectra and other spectroscopic and astrometric surveys. We describe the final SEGUE-2/SDSS-III improvements to the stellar parameter determinations based on the SEGUE Stellar Parameter Pipeline. We report a (g - i) color-effective temperature relation calibrated to the IRFM. We evaluate the accuracy and uncertainties associated with these stellar parameters by comparing with fundamental parameters, a sample of high-resolution spectra of SEGUE stars analyzed homogeneously, stars in well-studied clusters, and stars observed in common by the APOGEE survey. The final SEGUE spectra, calibration data, and derived parameters described here were released in SDSS-III Data Releasemore »
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- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Org.:
- SDSS-III Collaboration
- OSTI Identifier:
- 1896653
- Report Number(s):
- FERMILAB-PUB-22-793-SCD
Journal ID: ISSN 0067-0049; oai:inspirehep.net:2107591; TRN: US2310712
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal. Supplement Series
- Additional Journal Information:
- Journal Volume: 259; Journal Issue: 2; Journal ID: ISSN 0067-0049
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; Milky Way galaxy; radial velocity; sky surveys; spectroscopy; chemical abundances
Citation Formats
Rockosi, Constance M., Sun Lee, Young, Morrison, Heather L., Yanny, Brian, Johnson, Jennifer A., Lucatello, Sara, Sobeck, Jennifer, Beers, Timothy C., Allende Prieto, Carlos, An, Deokkeun, Bizyaev, Dmitry, Blanton, Michael R., Casagrande, Luca, Eisenstein, Daniel J., Gould, Andrew, Gunn, James E., Harding, Paul, Ivans, Inese I., Jacobson, H. R., Janesh, William, Knapp, Gillian R., Kollmeier, Juna A., Lépine, Sébastien, López-Corredoira, Martín, Ma, Zhibo, Newberg, Heidi J., Pan, Kaike, Prchlik, Jakub, Sayers, Conor, Schlesinger, Katharine J., Simmerer, Jennifer, and Weinberg, David H. SEGUE-2: Old Milky Way Stars Near and Far. United States: N. p., 2022.
Web. doi:10.3847/1538-4365/ac5323.
Rockosi, Constance M., Sun Lee, Young, Morrison, Heather L., Yanny, Brian, Johnson, Jennifer A., Lucatello, Sara, Sobeck, Jennifer, Beers, Timothy C., Allende Prieto, Carlos, An, Deokkeun, Bizyaev, Dmitry, Blanton, Michael R., Casagrande, Luca, Eisenstein, Daniel J., Gould, Andrew, Gunn, James E., Harding, Paul, Ivans, Inese I., Jacobson, H. R., Janesh, William, Knapp, Gillian R., Kollmeier, Juna A., Lépine, Sébastien, López-Corredoira, Martín, Ma, Zhibo, Newberg, Heidi J., Pan, Kaike, Prchlik, Jakub, Sayers, Conor, Schlesinger, Katharine J., Simmerer, Jennifer, & Weinberg, David H. SEGUE-2: Old Milky Way Stars Near and Far. United States. https://doi.org/10.3847/1538-4365/ac5323
Rockosi, Constance M., Sun Lee, Young, Morrison, Heather L., Yanny, Brian, Johnson, Jennifer A., Lucatello, Sara, Sobeck, Jennifer, Beers, Timothy C., Allende Prieto, Carlos, An, Deokkeun, Bizyaev, Dmitry, Blanton, Michael R., Casagrande, Luca, Eisenstein, Daniel J., Gould, Andrew, Gunn, James E., Harding, Paul, Ivans, Inese I., Jacobson, H. R., Janesh, William, Knapp, Gillian R., Kollmeier, Juna A., Lépine, Sébastien, López-Corredoira, Martín, Ma, Zhibo, Newberg, Heidi J., Pan, Kaike, Prchlik, Jakub, Sayers, Conor, Schlesinger, Katharine J., Simmerer, Jennifer, and Weinberg, David H. Thu .
"SEGUE-2: Old Milky Way Stars Near and Far". United States. https://doi.org/10.3847/1538-4365/ac5323. https://www.osti.gov/servlets/purl/1896653.
@article{osti_1896653,
title = {SEGUE-2: Old Milky Way Stars Near and Far},
author = {Rockosi, Constance M. and Sun Lee, Young and Morrison, Heather L. and Yanny, Brian and Johnson, Jennifer A. and Lucatello, Sara and Sobeck, Jennifer and Beers, Timothy C. and Allende Prieto, Carlos and An, Deokkeun and Bizyaev, Dmitry and Blanton, Michael R. and Casagrande, Luca and Eisenstein, Daniel J. and Gould, Andrew and Gunn, James E. and Harding, Paul and Ivans, Inese I. and Jacobson, H. R. and Janesh, William and Knapp, Gillian R. and Kollmeier, Juna A. and Lépine, Sébastien and López-Corredoira, Martín and Ma, Zhibo and Newberg, Heidi J. and Pan, Kaike and Prchlik, Jakub and Sayers, Conor and Schlesinger, Katharine J. and Simmerer, Jennifer and Weinberg, David H.},
abstractNote = {The Sloan Extension for Galactic Understanding and Exploration 2 (SEGUE-2) obtained 128,288 low-resolution spectra (R ~ 1800) of 118,958 unique stars in the first year of the Sloan Digital Sky Survey III (2008–2009). SEGUE-2 targeted prioritized distant halo tracers (blue horizontal-branch stars, K giants, and M giants) and metal-poor or kinematically hot populations. The main goal of SEGUE-2 was to target stars in the distant halo and measure their kinematics and chemical abundances to learn about the formation and evolution of the Milky Way. We present the SEGUE-2 field placement and target selection strategies. We discuss the success rate of the targeting based on the SEGUE-2 spectra and other spectroscopic and astrometric surveys. We describe the final SEGUE-2/SDSS-III improvements to the stellar parameter determinations based on the SEGUE Stellar Parameter Pipeline. We report a (g - i) color-effective temperature relation calibrated to the IRFM. We evaluate the accuracy and uncertainties associated with these stellar parameters by comparing with fundamental parameters, a sample of high-resolution spectra of SEGUE stars analyzed homogeneously, stars in well-studied clusters, and stars observed in common by the APOGEE survey. The final SEGUE spectra, calibration data, and derived parameters described here were released in SDSS-III Data Release 9 and continue to be included in all subsequent SDSS Data Releases. Because of its faint limiting magnitude and emphasis on the distant halo, the public SEGUE-2 data remain an important resource for the spectroscopy of stars in the Milky Way.},
doi = {10.3847/1538-4365/ac5323},
journal = {The Astrophysical Journal. Supplement Series},
number = 2,
volume = 259,
place = {United States},
year = {Thu Apr 07 00:00:00 EDT 2022},
month = {Thu Apr 07 00:00:00 EDT 2022}
}
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Figure 1: Layout of the SEGUE-1 and SEGUE-2 spectroscopy in Galactic coordinates in an Aitoff projection. The red circles are at the locations of the 7 deg2 spectroscopic fields that comprise the SEGUE-1 and SEGUE-2 surveys. These are not to scale but show the SEGUE-2 field layout strategy of smallmore »
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