Baade's window and APOGEE Metallicities, ages, and chemical abundances

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Baade's window and APOGEE Metallicities, ages, and chemical abundances

Schultheis, M. (författare): Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Bd Observ, F-06304 Nice, France

Rojas-Arriagada, A. (författare): Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Bd Observ, F-06304 Nice, France; Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile; Pontificia Univ Catolica Chile, Fac Fis, Inst Astron, Av Vicuna Mackenna 4860, Santiago, Chile

Garcia Perez, A. E. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain; Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

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Jönsson, H. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain; Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

Hayden, M. (författare): Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Bd Observ, F-06304 Nice, France

Nandakumar, G. (författare): Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Bd Observ, F-06304 Nice, France

Cunha, K. (författare): Observ Nacl, BR-20921400 Sao Cristovao, RJ, Brazil

Allende Prieto, C. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain; Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain

Holtzman, J. A. (författare): New Mexico State Univ, Las Cruces, NM 88003 USA

Beers, T. C. (författare): Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA; Univ Notre Dame, JINA Ctr Evolut Elements, Notre Dame, IN 46556 USA

Bizyaev, D. (författare): Apache Point Observ, POB 59, Sunspot, NM 88349 USA; New Mexico State Univ, POB 59, Sunspot, NM 88349 USA; Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119991, Russia

Brinkmann, J. (författare): Apache Point Observ, POB 59, Sunspot, NM 88349 USA; New Mexico State Univ, POB 59, Sunspot, NM 88349 USA

Carrera, R. (författare): Inst Astrofis Canarias, Tenerife 38205, Spain

Cohen, R. E. (författare): Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

Geisler, D. (författare): Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

Hearty, F. R. (författare): Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA

Fernandez-Tricado, J. G. (författare): Univ Besancon, Observ Sci, 41 Ave Observ, F-25000 Besancon, France

Maraston, C. (författare): Univ Portsmouth, ICG, Dennis Sciama Bldg, Burnaby Rd, Portsmouth PO13FX, Hants, England

Minnitti, D. (författare): Univ Andres Bello, Fac Ciencias Exactas, Dept Fis, Av Fernandez Concha 700, Santiago 7591538, Chile; Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile; Vatican Observ, V00120, Vatican City, Vatican

Nitschelm, C. (författare): Univ Antofagasta, Unidad Astron, Ave Angamos 601, Antofagasta 1270300, Chile

Roman-Lopes, A. (författare): Univ La Serena, Fac Ciencias, Dept Fis, La Serena 1200, Chile

Schneider, D. P. (författare): Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA; Penn State Univ, Inst Gravitat & Cosmos, University Pk, PA 16802 USA

Tang, B. (författare): Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

Villanova, S. (författare): Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

Zasowski, G. (författare): Johns Hopkins Univ, Ctr Astrophys Sci, Dept Phys & Astron, 3400 North Charles St, Baltimore, MD 21218 USA; Univ Utah, Dept Phys & Astron, 115 S 1400 E, Salt Lake City, UT 84112 USA

Majewski, S. R. (författare): Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

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2017-03-21
2017
Engelska.
Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 600

Relaterad länk:: https://doi.org/10.1...; visa fler...; https://www.aanda.or...; https://urn.kb.se/re...; https://doi.org/10.1...; visa färre...

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Context. Baade's window (BW) is one of the most observed Galactic bulge fields in terms of chemical abundances. Owing to its low and homogeneous interstellar absorption it is considered the perfect calibration field for Galactic bulge studies. Aims. In the era of large spectroscopic surveys, calibration fields such as BW are necessary for cross calibrating the stellar parameters and individual abundances of the APOGEE survey. Methods. We use the APOGEE BW stars to derive the metallicity distribution function (MDF) and individual abundances for alpha- and iron-peak elements of the APOGEE ASPCAP pipeline (DR13), as well as the age distribution for stars in BW. Results. We determine the MDF of APOGEE stars in BW and find a remarkable agreement with that of the Gaia-ESO survey (GES). Both exhibit a clear bimodal distribution. We also find that the Mg-metallicity planes of the two surveys agree well, except for the metal-rich part ([Fe/H] > 0.1), where APOGEE finds systematically higher Mg abundances with respect to the GES. The ages based on the [C/N] ratio reveal a bimodal age distribution, with a major old population at similar to 10 Gyr, with a decreasing tail towards younger stars. A comparison of stellar parameters determined by APOGEE and those determined by other sources reveals detectable systematic offsets, in particular for spectroscopic surface gravity estimates. In general, we find a good agreement between individual abundances of O,Na, Mg, Al, Si, K, Ca, Cr, Mn, Co, and Ni from APOGEE with that of literature values. Conclusions. We have shown that in general APOGEE data show a good agreement in terms of MDF and individual chemical abundances with respect to literature works. Using the [C/N] ratio we found a significant fraction of young stars in BW.

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Baade's window and APOGEE Metallicities, ages, and chemical abundances

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