OGLE-ing the Magellanic System: Photometric Metallicity from Fundamental Mode RR Lyrae Stars

• Autorzy: Skowron D. M. , Soszyński I. , Udalski A. , Szymański M. K. , Pietrukowicz P. , Skowron J. , Poleski J. , Wyrzykowski Ł. , Ulaczyk K. , Kozłowski S. , Mróz P. , Pawlak M.
• Języki publikacji: EN

Abstrakty

EN

In an era of extensive photometric observations, the catalogs of RR Lyr type variable stars number tens of thousands of objects. The relation between the iron abundance [Fe/H] and the Fourier parameters of the stars light curve allows us to investigate mean metallicities and metallicity gradients in various stellar environments, independently of time-consuming spectroscopic observations. In this paper we use almost 6500 V- and I-band light curves of fundamental mode RR Lyr stars from the OGLE-IV survey to provide a relation between the V- and I-band phase parameter ϕ31 used to estimate [Fe/H]. The relation depends on metallicity, which limits its applicability. We apply this relation to metallicity formulae developed for the Johnson V- and the Kepler Kp-band to obtain the relation between [Fe/H] and ϕ31 for the I-band photometry. Last, we apply the new relation of Nemec to the OGLE-IV fundamental mode RR Lyr stars data and construct a metallicity map of the Magellanic Clouds. Median [Fe/H] is -1.39±0.44 dex for the LMC and -1.77±0.48 dex for the SMC, on the Jurcsik metallicity scale. We also find a metallicity gradient within the LMC with a slope of -0.029±0.002 dex/kpc in the inner 5 kpc and -0.030±0.003 dex/kpc beyond 8 kpc, and no gradient in-between (-0.019±0.002 dex/kpc integrally). We do not observe a metallicity gradient in the SMC, although we show that the metal-rich RRab stars are more concentrated toward the SMC center than the metal-poor.

Słowa kluczowe

EN

stars: abundances; stars: statistics; stars: variables: RR~Lyr; galaxies: abundances; Magellanic Clouds

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2016
• Tom: Vol. 66, No. 3
• Strony: 269--292
• Opis fizyczny: Bibliogr. 42 poz., rys., tab., wykr.

Twórcy

autor

Skowron D. M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Soszyński I.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Udalski A.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Szymański M. K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Pietrukowicz P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Skowron J.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Poleski J.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH43210, USA

autor

Wyrzykowski Ł.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Ulaczyk K.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
• Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV47AL, UK

autor

Kozłowski S.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Mróz P.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Pawlak M.

• Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

Bibliografia

• Alcock, C.J., et al. 2000, AJ, 119, 2194.
• Benkő, J.M., et al. 2010, MNRAS, 409, 1585.
• Braga, V.F., et al. 2015, ApJ, 799, 165.
• Carrera, R., Gallart, C., Aparicio, A., Costa, E., Méndez, R.A., and Noël, N.E.D. 2008, AJ, 136, 1039.
• Carrera, R., Gallart, C., Aparicio, A., and Hardy, E. 2011, AJ, 142, 61.
• Carretta, E., Bragaglia, A., Gratton, R., D’Orazi, V., and Lucatello, S. 2009, A&A, 508, 695.
• Cioni, M.-R.L. 2009, A&A, 506, 1137.
• Deb, S., and Singh, H.P. 2010, MNRAS, 402, 691.
• Deb, S., and Singh, H.P. 2014, MNRAS, 438, 2440.
• Deb, S., Singh, H.P., Kumar, S., and Shashi M. 2015, MNRAS, 449, 2768.
• Dobbie, P.D., Cole, A.A., Subramaniam, A., and Keller, S. 2014, MNRAS, 442, 1680.
• Feast, M.W., Abedigamba, O.P., and Whitelock, P.A. 2010, MNRAS, 408, 76.
• Gonzalez, O.A., Rejkuba, M., Zoccali, M., Valent, E., Minniti, D., and Tobar, R. 2013, A&A, 552, 110.
• Grocholski, A.J., Cole, A.A., Sarajedini, A., Geisler, D., and Smith, V.V. 2006, AJ, 132, 1630.
• Haschke, R., Grebel, E.K., Duffau, S., and Jin, S. 2012, AJ, 143, 48.
• Jeon, Y.-B., Ngeow, C.-C., and Nemec, J.M. 2014, IAU Symp., 301, 427.
• Jurcsik, J. 1995, Acta Astron., 45, 653.
• Jurcsik, J., and Kovács, G. 1996, A&A, 312, 111.
• Kapakos, E., Hatzidimitriou, D., and Soszyński, I. 2011, MNRAS, 415, 1366.
• Kapakos, E., and Hatzidimitriou, D. 2012, MNRAS, 426, 2063.
• Kinemuchi, K., et al. 2006, AJ, 132, 1202.
• Kovács, G., and Zsoldos, E. 1995, A&A, 293, L57.
• Nemec, J.M., et al. 2013, ApJ, 773, 181.
• Papadakis, I., Hatzidimitriou, D., Croke, B.F.W., and Papamastorakis, I. 2000, AJ, 119, 851.
• Parisi, M.C., Grocholski, A.J., Geisler, D., Sarajedini, A., and Clariá, J.J. 2009, AJ, 138, 517.
• Piatti, A.E., and Geisler, D. 2013, AJ, 145, 17.
• Pietrukowicz, P., et al. 2012, ApJ, 750, 169.
• Pietrukowicz, P., et al. 2015, ApJ, 811, 113.
• Sandage, A. 2004, AJ, 128, 858.
• Sans Fuentes, S.A., and De Ridder, J. 2014, A&A, 571, 59.
• Smolec, R. 2005, Acta Astron., 55, 59.
• Soszyński, I., et al. 2009, Acta Astron., 59, 1.
• Soszyński, I., et al. 2011, Acta Astron., 61, 1.
• Soszyński, I., et al. 2014, Acta Astron., 64, 177.
• Soszyński, I., et al. 2016, Acta Astron., 66, 131.
• Szczygieł, D., Pojmański, G., and Pilecki, B. 2009, Acta Astron., 59, 137.
• Torrealba, G., et al. 2015, MNRAS, 446, 2251.
• Udalski, A., Szymański, M.K., and Szymański, G. 2015, Acta Astron., 65, 1.
• van der Marel, R.P., and Cioni, M.-R.L. 2001, AJ, 122, 1807.
• Wagner-Kaiser, R., and Sarajedini, A. 2013, MNRAS, 431, 1565.
• Weinberg, M.D., and Nikolaev, S. 2001, ApJ, 548, 712.
• Zinn, R., and West, M.J. 1984, ApJS, 55, 45.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).