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Title: A Precision Determination of the Effect of Metallicity on Cepheid Absolute Magnitudes in VIJHK Bands from Magellanic Cloud Cepheids

Abstract

Using high-quality observed period–luminosity ( P – L ) relations in both Magellanic Clouds in the VIJHK s bands and optical and near-infrared Wesenheit indices, we determine the effect of metallicity on Cepheid P – L relations by comparing the relative distance between the LMC and SMC as determined from the Cepheids to the difference in distance between the Clouds that has been derived with very high accuracy from late-type eclipsing binary systems. Within an uncertainty of 3%, which is dominated by the uncertainty on the mean difference in metallicity between the Cepheid populations in the LMC and SMC, we find metallicity effects smaller than 2% in all bands and in the Wesenheit indices, consistent with a zero metallicity effect. This result is valid for the metallicity range from −0.35 dex to −0.75 dex corresponding to the mean [Fe/H] values for classical Cepheids in the LMC and SMC, respectively. Yet most Cepheids in galaxies beyond the Local Group and located in the less crowded outer regions of these galaxies do fall into this metallicity regime, making our result important for applications to determine the distances to spiral galaxies well beyond the Local Group. Our result supports previous findings that indicatedmore » a very small metallicity effect on the near-infrared absolute magnitudes of classical Cepheids, and resolves the dispute about the size and sign of the metallicity effect in the optical spectral range. It also resolves one of the most pressing problems in the quest toward a measurement of the Hubble constant with an accuracy of 1% from the Cepheid–supernova Ia method.« less

Authors:
; ; ;  [1]; ;  [2]; ;  [3];  [4];  [5];  [6]
  1. Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw (Poland)
  2. Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción (Chile)
  3. Institute for Astronomy, University of Hawaii at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
  4. Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, D-14482, Potsdam (Germany)
  5. Department of Astronomy, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
  6. Warsaw University Observatory, Al. Ujazdowskie 4, PL-00-478 Warsaw (Poland)
Publication Date:
OSTI Identifier:
22663476
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 842; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; CEPHEIDS; COMPARATIVE EVALUATIONS; ECLIPSE; LUMINOSITY; MAGELLANIC CLOUDS; METALLICITY; PRESSING; RED SHIFT

Citation Formats

Wielgórski, Piotr, Pietrzyński, Grzegorz, Zgirski, Bartłomiej, Graczyk, Dariusz, Gieren, Wolfgang, Górski, Marek, Kudritzki, Rolf-Peter, Bresolin, Fabio, Storm, Jesper, Matsunaga, Noriyuki, and Soszyński, Igor, E-mail: pwielgor@camk.edu.pl. A Precision Determination of the Effect of Metallicity on Cepheid Absolute Magnitudes in VIJHK Bands from Magellanic Cloud Cepheids. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA7565.
Wielgórski, Piotr, Pietrzyński, Grzegorz, Zgirski, Bartłomiej, Graczyk, Dariusz, Gieren, Wolfgang, Górski, Marek, Kudritzki, Rolf-Peter, Bresolin, Fabio, Storm, Jesper, Matsunaga, Noriyuki, & Soszyński, Igor, E-mail: pwielgor@camk.edu.pl. A Precision Determination of the Effect of Metallicity on Cepheid Absolute Magnitudes in VIJHK Bands from Magellanic Cloud Cepheids. United States. doi:10.3847/1538-4357/AA7565.
Wielgórski, Piotr, Pietrzyński, Grzegorz, Zgirski, Bartłomiej, Graczyk, Dariusz, Gieren, Wolfgang, Górski, Marek, Kudritzki, Rolf-Peter, Bresolin, Fabio, Storm, Jesper, Matsunaga, Noriyuki, and Soszyński, Igor, E-mail: pwielgor@camk.edu.pl. Tue . "A Precision Determination of the Effect of Metallicity on Cepheid Absolute Magnitudes in VIJHK Bands from Magellanic Cloud Cepheids". United States. doi:10.3847/1538-4357/AA7565.
@article{osti_22663476,
title = {A Precision Determination of the Effect of Metallicity on Cepheid Absolute Magnitudes in VIJHK Bands from Magellanic Cloud Cepheids},
author = {Wielgórski, Piotr and Pietrzyński, Grzegorz and Zgirski, Bartłomiej and Graczyk, Dariusz and Gieren, Wolfgang and Górski, Marek and Kudritzki, Rolf-Peter and Bresolin, Fabio and Storm, Jesper and Matsunaga, Noriyuki and Soszyński, Igor, E-mail: pwielgor@camk.edu.pl},
abstractNote = {Using high-quality observed period–luminosity ( P – L ) relations in both Magellanic Clouds in the VIJHK s bands and optical and near-infrared Wesenheit indices, we determine the effect of metallicity on Cepheid P – L relations by comparing the relative distance between the LMC and SMC as determined from the Cepheids to the difference in distance between the Clouds that has been derived with very high accuracy from late-type eclipsing binary systems. Within an uncertainty of 3%, which is dominated by the uncertainty on the mean difference in metallicity between the Cepheid populations in the LMC and SMC, we find metallicity effects smaller than 2% in all bands and in the Wesenheit indices, consistent with a zero metallicity effect. This result is valid for the metallicity range from −0.35 dex to −0.75 dex corresponding to the mean [Fe/H] values for classical Cepheids in the LMC and SMC, respectively. Yet most Cepheids in galaxies beyond the Local Group and located in the less crowded outer regions of these galaxies do fall into this metallicity regime, making our result important for applications to determine the distances to spiral galaxies well beyond the Local Group. Our result supports previous findings that indicated a very small metallicity effect on the near-infrared absolute magnitudes of classical Cepheids, and resolves the dispute about the size and sign of the metallicity effect in the optical spectral range. It also resolves one of the most pressing problems in the quest toward a measurement of the Hubble constant with an accuracy of 1% from the Cepheid–supernova Ia method.},
doi = {10.3847/1538-4357/AA7565},
journal = {Astrophysical Journal},
number = 2,
volume = 842,
place = {United States},
year = {Tue Jun 20 00:00:00 EDT 2017},
month = {Tue Jun 20 00:00:00 EDT 2017}
}