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The '''Araucaria Project''' is an international science collaboration focused on improving the calibration of the [[extragalactic distance scale]] based on observations of major distance indicators in several nearby [[galaxies]].
{{Orphan|date=December 2014}}

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'''The Araucaria Project''' - international science collaboration focused on improving calibration of the extragalactic distance scale based on observations of major distance indicators in several nearby galaxies.


== Project ==
== Project ==
The Araucaria Project is a collaboration between astronomers from institutions in Europe, Chile and the US. Its principal aim is to provide an improved calibration of the local extragalactic distance scale. In the process of setting up the extragalactic distance scale, the greatest difficulty leading to the currently largest contribution on the systematic uncertainty of the Hubble constant lies in the determination of accurate absolute distances to nearby galaxies. The principal reason for this persisting difficulty is in the unknown dependencies of stellar standard candles, used to measure the distances of nearby galaxies, on the environmental properties of their host galaxies (metallicity, age of the stellar populations etc.). The Araucaria Project is an effort to remedy this situation for several of the most important stellar candles, including [[Cepheid variable]]s, [[RR Lyrae variable|RR Lyrae stars]], [[red clump]] giants, and [[blue supergiant]]s which all have the potential to provide accurate distance determinations to nearby galaxies once their environmental dependencies are well calibrated. Our strategy is to determine precise distances using the various stellar candles to handful of galaxies with widely different environmental parameters, carefully analyze the distance differences between the different stellar candles, and how they vary with the environmental parameters of their host galaxies.
The Araucaria Project is a collaboration between astronomers from institutions in [[Europe]], [[Chile]] and the [[US]]. Its principal aim is to provide an improved calibration of the local extragalactic distance scale. In the process of setting up the extragalactic distance scale, the greatest difficulty leading to the currently largest contribution on the systematic uncertainty of the [[Hubble constant]] lies in the determination of accurate absolute distances to nearby galaxies. The principal reason for this persisting difficulty is in the unknown dependencies of stellar [[standard candles]], used to measure the distances of nearby galaxies, on the environmental properties of their host galaxies (metallicity, age of the stellar populations etc.). The Araucaria Project is an effort to remedy this situation for several of the most important stellar candles, including [[Cepheid variable]]s, [[RR Lyrae variable|RR Lyrae stars]], [[red clump]] giants, and [[blue supergiant]]s which all have the potential to provide accurate distance determinations to nearby galaxies once their environmental dependencies are well calibrated.


The sample of galaxies include [[NGC 6822]], [[IC 1613]] and [[NGC 3109]] in the [[Local Group]], and [[NGC 55]], [[NGC 247]], [[NGC 300]] and [[NGC 7793]] in the [[Sculptor Group]]. All our target galaxies can be resolved into their stellar components with the modern telescopes and instruments available to the project.
The sample of galaxies include [[NGC 6822]], [[IC 1613]] and [[NGC 3109]] in the [[Local Group]], and [[NGC 55]], [[NGC 247]], [[NGC 300]] and [[NGC 7793]] in the [[Sculptor Group]].


== Main discoveries ==
== Main discoveries ==
* The dynamical mass of a classical Cepheid variable star in an eclipsing binary system<ref>{{cite journal|author=Pietrzyński|display-authors=etal|date=2010|title=The dynamical mass of a classical Cepheid variable star in an eclipsing binary system|url=http://www.nature.com/nature/journal/v468/n7323/full/nature09598.html|journal=[[Nature (journal)|Nature]]|volume=468|issue=7323|pages=542–544|arxiv=1012.0231|bibcode=2010Natur.468..542P|doi=10.1038/nature09598|pmid=21107425|via=}}</ref>
* The dynamical mass of a classical Cepheid variable star in an eclipsing binary system<ref>{{cite journal|author=Pietrzyński|display-authors=etal|date=2010|title=The dynamical mass of a classical Cepheid variable star in an eclipsing binary system|journal=[[Nature (journal)|Nature]]|volume=468|issue=7323|pages=542–544|arxiv=1012.0231|bibcode=2010Natur.468..542P|doi=10.1038/nature09598|pmid=21107425}}</ref>
* RR-Lyrae-type pulsations from a 0.26-solar-mass star in a binary system<ref>{{cite journal|author=Pietrzyński|display-authors=etal|date=2012|title=RR-Lyrae-type pulsations from a 0.26-solar-mass star in a binary system|url=|journal=[[Nature (journal)|Nature]]|volume=484|issue=7392|pages=75–77|arxiv=1204.1872|bibcode=2012Natur.484...75P|doi=10.1038/nature10966|pmid=22481359|via=}}</ref>
* RR-Lyrae-type pulsations from a 0.26-solar-mass star in a binary system<ref>{{cite journal|author=Pietrzyński|display-authors=etal|date=2012|title=RR-Lyrae-type pulsations from a 0.26-solar-mass star in a binary system|journal=[[Nature (journal)|Nature]]|volume=484|issue=7392|pages=75–77|arxiv=1204.1872|bibcode=2012Natur.484...75P|doi=10.1038/nature10966|pmid=22481359}}</ref>
* An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent<ref>{{cite journal|author=Pietrzyński|display-authors=etal|date=2013|title=An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent|url=|journal=[[Nature (journal)|Nature]]|volume=495|issue=7439|pages=76–79|arxiv=1303.2063|bibcode=2013Natur.495...76P|doi=10.1038/nature11878|pmid=23467166|via=}}</ref>, to one per cent<ref>{{Cite journal|last=Pietrzyński|first=G.|last2=Graczyk|first2=D.|last3=Gallenne|first3=A.|last4=Gieren|first4=W.|last5=Thompson|first5=I. B.|last6=Pilecki|first6=B.|last7=Karczmarek|first7=P.|last8=Górski|first8=M.|last9=Suchomska|first9=K.|last10=Taormina|first10=M.|last11=Zgirski|first11=B.|date=2019|title=A distance to the Large Magellanic Cloud that is precise to one per cent|url=http://www.nature.com/articles/s41586-019-0999-4|journal=Nature|language=en|volume=567|issue=7747|pages=200–203|doi=10.1038/s41586-019-0999-4|issn=0028-0836|via=}}</ref>
* An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent,<ref>{{cite journal|author=Pietrzyński|display-authors=etal|date=2013|title=An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent|journal=[[Nature (journal)|Nature]]|volume=495|issue=7439|pages=76–79|arxiv=1303.2063|bibcode=2013Natur.495...76P|doi=10.1038/nature11878|pmid=23467166}}</ref> to one per cent<ref>{{Cite journal|last=Pietrzyński|first=G.|last2=Graczyk|first2=D.|last3=Gallenne|first3=A.|last4=Gieren|first4=W.|last5=Thompson|first5=I. B.|last6=Pilecki|first6=B.|last7=Karczmarek|first7=P.|last8=Górski|first8=M.|last9=Suchomska|first9=K.|last10=Taormina|first10=M.|last11=Zgirski|first11=B.|date=2019|title=A distance to the Large Magellanic Cloud that is precise to one per cent|journal=Nature|language=en|volume=567|issue=7747|pages=200–203|doi=10.1038/s41586-019-0999-4|pmid=30867610|issn=0028-0836|arxiv=1903.08096}}</ref>

== Team members ==
* Grzegorz Pietrzyński - [[Principal Investigator|PI]] ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
* Wolfgang Gieren - [[Principal Investigator|PI]] ([http://www.astroudec.cl/ Astronomy Departament UdeC], [[Concepción, Chile|Concepcion]], [[Chile]])
* Dariusz Graczyk ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
* Bogumił Pilecki ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
*Ksenia Suchomska ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
*Gergely Hajdu ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
* Marek Górski ([http://www.astroudec.cl/ Astronomy Departament UdeC], [[Concepción, Chile|Concepcion]], [[Chile]])
*Paulina Karczmarek ([http://www.astroudec.cl/ Astronomy Departament UdeC], [[Concepción, Chile|Concepcion]], [[Chile]])
*Weronika Narloch ([http://www.astroudec.cl/ Astronomy Departament UdeC], [[Concepción, Chile|Concepcion]], [[Chile]])
* Rolf Kudritzki ([[University of Hawaii]], [[United States]])
* Fabio Bresolin ([[University of Hawaii]], [[United States]])
* Ian Thompson ([[Carnegie Institution for Science]], [[United States]])
* Jesper Storm ([[Astrophysikalisches Institut Potsdam]], [[Potsdam]], [[Germany]])
* Nicolas Nardetto ([[Côte d'Azur Observatory]], [[Nice]], [[France]])
* Alexandre Gallenne ([http://www.astroudec.cl/ Astronomy Departament UdeC], [[Concepción, Chile|Concepcion]], [[Chile]])

=== PhD Students ===
* Piotr Wielgórski ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
* Bartłomiej Zgirski ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
* Mónica Taormina ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])
*Gonzalo Ignacio Rojas García ([http://www.camk.edu.pl/ Nicolaus Copernicus Astronomical Center PAS], [[Warsaw]], [[Poland]])


==References==
==References==

Latest revision as of 02:37, 4 August 2021

The Araucaria Project is an international science collaboration focused on improving the calibration of the extragalactic distance scale based on observations of major distance indicators in several nearby galaxies.

Project[edit]

The Araucaria Project is a collaboration between astronomers from institutions in Europe, Chile and the US. Its principal aim is to provide an improved calibration of the local extragalactic distance scale. In the process of setting up the extragalactic distance scale, the greatest difficulty leading to the currently largest contribution on the systematic uncertainty of the Hubble constant lies in the determination of accurate absolute distances to nearby galaxies. The principal reason for this persisting difficulty is in the unknown dependencies of stellar standard candles, used to measure the distances of nearby galaxies, on the environmental properties of their host galaxies (metallicity, age of the stellar populations etc.). The Araucaria Project is an effort to remedy this situation for several of the most important stellar candles, including Cepheid variables, RR Lyrae stars, red clump giants, and blue supergiants which all have the potential to provide accurate distance determinations to nearby galaxies once their environmental dependencies are well calibrated.

The sample of galaxies include NGC 6822, IC 1613 and NGC 3109 in the Local Group, and NGC 55, NGC 247, NGC 300 and NGC 7793 in the Sculptor Group.

Main discoveries[edit]

  • The dynamical mass of a classical Cepheid variable star in an eclipsing binary system[1]
  • RR-Lyrae-type pulsations from a 0.26-solar-mass star in a binary system[2]
  • An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent,[3] to one per cent[4]

References[edit]

  1. ^ Pietrzyński; et al. (2010). "The dynamical mass of a classical Cepheid variable star in an eclipsing binary system". Nature. 468 (7323): 542–544. arXiv:1012.0231. Bibcode:2010Natur.468..542P. doi:10.1038/nature09598. PMID 21107425.
  2. ^ Pietrzyński; et al. (2012). "RR-Lyrae-type pulsations from a 0.26-solar-mass star in a binary system". Nature. 484 (7392): 75–77. arXiv:1204.1872. Bibcode:2012Natur.484...75P. doi:10.1038/nature10966. PMID 22481359.
  3. ^ Pietrzyński; et al. (2013). "An eclipsing binary distance to the Large Magellanic Cloud accurate to 2 per cent". Nature. 495 (7439): 76–79. arXiv:1303.2063. Bibcode:2013Natur.495...76P. doi:10.1038/nature11878. PMID 23467166.
  4. ^ Pietrzyński, G.; Graczyk, D.; Gallenne, A.; Gieren, W.; Thompson, I. B.; Pilecki, B.; Karczmarek, P.; Górski, M.; Suchomska, K.; Taormina, M.; Zgirski, B. (2019). "A distance to the Large Magellanic Cloud that is precise to one per cent". Nature. 567 (7747): 200–203. arXiv:1903.08096. doi:10.1038/s41586-019-0999-4. ISSN 0028-0836. PMID 30867610.

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Araucaria_Project&oldid=1037023392"