Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-06
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astronomy & Astrophysics, 15 pages, 11 figures
Scientific paper
10.1051/0004-6361:20066848
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.
Gullieuszik Marco
Habing Harm J.
Held Enrico V.
Rejkuba Marina
Rosa Cioni Maria
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