The Young Stellar Population of IC1613. I. A New Catalogue of OB Associations

Abstract

Context: Determining the parameters of massive stars is crucial to understand many processes in galaxies and the Universe, since these objects are important sources of ionization, chemical enrichment and momentum. 10m class telescopes enable us to perform detailed quantitative spectroscopic analyses of massive stars in other galaxies, sampling areas of different metallicity. Relating the stars to their environment is crucial to understand the physical processes ruling their formation and evolution. Aims: In preparation for the GTC, our goal is to build a catalogue of massive star candidates in the metal-poor irregular galaxy IC1613 with high astrometric accuracy, apt for the current generation of multi-object spectrographs. A census of OB associations in this galaxy is also needed, to provide important additional information about age and environment of the candidate OB stars. Methods: From INT-WFC observations, we have built an astrometric and photometric catalogue of stars in IC1613. Candidate blue massive stars are preselected from their colors. A friends-of-friends algorithm is developed to find their clustering in the galaxy. While a common physical origin for all the members of the associations cannot be ensured, this is a necessary first step to place candidate OB stars in a population context. Results: We have produced a deep catalogue of targets in IC1613 that covers a large field of view. To achieve high astrometric accuracy a new astrometric procedure is developed for the INT-WFC data. We have also built a catalogue of OB associations in IC1613. We have found that they concentrate in the central regions, specially in the HII bubbles. The study of extinction confirms that it is patchy, with local values of color-excess above the foreground value.

arXiv commentAccepted for publication in Astronomy and Astrophysics. 16 pages + appendix (14 pages); 20 figures

References in corpus (26)

• The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turn-offs. I. Results from 19 OB Associations in the Magellanic Clouds
• Fundamental parameters of Galactic luminous OB stars VI. Temperatures, masses and WLR of Cyg OB2 supergiants
• CHORIZOS: a CHi-square cOde for parameteRized modelIng and characteriZation of phOtometry and Spectrophotometry
• The Spatial Evolution of Stellar Structures in the LMC
• Uncovering Additional Clues to Galaxy Evolution. I. Dwarf Irregulars in the Field
• VLT spectroscopy of blue supergiants in IC 1613
• Deep HST Imaging of IC 1613. I. Variable Stars and Distance
• Hierarchical Star-Formation in M33: Fundamental properties of the star-forming regions
• $10^{51}$ Ergs: The Evolution of Shell Supernova Remnants
• Stellar Populations at the Center of IC 1613
• The Araucaria Project. The Distance to the Local Group Galaxy IC 1613 from Near-Infrared Photometry of Cepheid Variables
• Hot Dust and PAH Emission at Low Metallicity: A Spitzer Survey of Local Group and Other Nearby Dwarf Galaxies
• Stellar Content and Recent Star Formation History of the Local Group Dwarf Irregular Galaxy IC1613
• A Determination of the Hubble Constant from Cepheid Distances and a Model of the Local Peculiar Velocity Field
• The Araucaria Project: VLT-spectroscopy of blue massive stars in NGC 55
• On the neutral gas distribution and kinematics in the dwarf irregular galaxy IC 1613
• An HST study of OB associations and star clusters in M101
• Kinematics of the ionized gas in the Local Group irregular galaxy IC 1613
• Detailed Kinematic Study of the Ionized and Neutral Gas in the Complex of Star Formation in the Galaxy IC 1613
• OB Stellar Associations in the Large Magellanic Cloud: Survey of young stellar systems
• The catalogue of OB associations in IC 1613
• The influence of massive stars in the interstellar medium of IC 1613: the supernova remnant S8 and the nebula S3 associated with a WO star
• The size and structure of the spheroid of IC 1613
• Interstellar Medium Surrounding the WO Star in the Galaxy IC 1613: New Optical and Radio Observations
• Observations of Stellar Objects at a Shell Boundary in the Star-Forming Complex in the Galaxy IC1613
• A Giant Bipolar Shell around the WO star in the Galaxy IC 1613: Structure and Kinematics

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• OB stars at the lowest Local Group metallicity: GTC-OSIRIS observations of Sextans A
• On the nature of WO stars: a quantitative analysis of the WO3 star DR1 in IC 1613
• The young stellar population of IC 1613. III. New O-type stars unveiled by GTC-OSIRIS
• A new reference catalogue for the very metal-poor Universe: +150 OB stars in Sextans A
• The origin of a distributed stellar population in the star-forming region W4
• Quantitative Spectroscopy of Supergiants in the Local Group Dwarf Galaxy IC 1613: Metallicity and Distance
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• The wind properties of O-type stars at sub-SMC metallicity
• From gas to stars: MUSEings on the internal evolution of IC 1613
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