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Baade's window and APOGEE Metallicities, ages, and chemical abundances
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- Schultheis, M. (författare)
- Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Bd Observ, F-06304 Nice, France.
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- 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.
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- Garcia Perez, A. E. (författare)
- Inst Astrofis Canarias, Tenerife 38205, Spain.;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.
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- Nitschelm, C. (författare)
- visa färre...
- Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Bd Observ, F-06304 Nice, France 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. (creator_code:org_t)
- 2017-03-21
- 2017
- Engelska.
- Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 600
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: bulge
- Galaxy: stellar content
- stars: fundamental parameters
- stars: abundances
- infrared: stars
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- art (ämneskategori)
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