Near-Infrared photometry of carbon stars in the Sagittarius dwarf irregular galaxy and DDO 210

Abstract

We investigate the intermediate-age asymptotic giant branch stellar population of two Local Group dwarf irregular galaxies to characterize their carbon star population in near-infrared (IR). Our work is based on J and K-band SOFI near-IR photometry complemented with optical ground based and HST photometry. We show that near-IR photometry is a very powerful tool for carbon star detection. We recovered two out of three previously-known carbon stars in DDO 210 and discovered six additional objects in this galaxy which have optical and near-IR colors consistent with carbon giants. This brings the total number of bona-fide C-star candidates in DDO 210 to nine. We detected a large population of C-star candidates in SagDIG, 18 of which were previously identified in Demers & Battinelli (2002) and Cook (1987), and six new bona-fide carbon stars. We present their optical and near-IR colors and use their luminosity function to put constraints on the star formation history (SFH) in this dwarf irregular galaxy.

Accepted for publication in Astronomy & Astrophysics, 15 pages, 11 figures

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• The evolved stars of Leo II dSph galaxy from near-infrared UKIRT/WFCAM observations
• Astrophysical Distance Scale II. Application of the JAGB Method: A Nearby Galaxy Sample
• The UK Infrared Telescope M33 monitoring project. IV. Variable red giant stars across the galactic disc
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• Resolving Stellar Populations outside the Local Group: MAD observations of UKS2323-326
• The extended structure of the dwarf irregular galaxy Sagittarius
• The Isaac Newton Telescope monitoring survey of Local Group dwarf galaxies--V. The star formation history of Sagittarius dwarf irregular galaxy derived from long period variable stars
• On the HI-Hole and AGB Stellar Population of the Sagittarius Dwarf Irregular Galaxy
• The ionization structure and chemical history in isolated H II regions of dwarf galaxies with IFU I. The Sagittarius Dwarf Irregular Galaxy