DISTANCE AND THE INITIAL MASS FUNCTION OF YOUNG OPEN CLUSTERS IN THE {eta} CARINA NEBULA: Tr 14 AND Tr 16

Journal Article · Wed Feb 15 04:00:00 EST 2012 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/143/2/41· OSTI ID:22034713

Hur, Hyeonoh; Sung, Hwankyung ^[1]

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1. Department of Astronomy and Space Science, Sejong University, 98 Kunja-Dong, Kwangjin-gu, Seoul 143-747 (Korea, Republic of)

We present new UBVI{sub c} CCD photometry of the young open clusters Trumpler 14 (Tr 14) and Trumpler 16 (Tr 16) in the {eta} Carina Nebula. We also identify the optical counterpart of Chandra X-ray sources and Two Micron All Sky Survey point sources. The members of the clusters were selected from the proper-motion study, spectral types, reddening characteristics, and X-ray or near-IR excess emission. An abnormal reddening law R{sub V,cl} = 4.4 {+-} 0.2 was obtained for the stars in the {eta} Carina Nebula using the 141 early-type stars with high proper-motion membership probability (P{sub {mu}} gE 70%). We determined the distance to each cluster and conclude that Tr 14 and Tr 16 have practically the same distance modulus of V{sub 0} - M{sub V} = 12.3 {+-} 0.2 mag (d = 2.9 {+-} 0.3 kpc). The slope of the initial mass function was determined to be {Gamma} = -1.3 {+-} 0.1 for Tr 14, {Gamma} = -1.3 {+-} 0.1 for Tr 16, and {Gamma} = -1.4 {+-} 0.1 for all members in the observed region for the stars with log mgE0.2. We also estimated the age of the clusters to be about 1-3 Myr from the evolutionary stage of evolved stars and low-mass pre-main-sequence stars.

• OSTI ID: 22034713
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 2 Vol. 143; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTRONOMY
ASTROPHYSICS
CHARGE-COUPLED DEVICES
COSMIC X-RAY SOURCES
DISTANCE
LUMINOSITY
MAIN SEQUENCE STARS
MASS
NEAR INFRARED RADIATION
NEBULAE
PHOTOMETRY
PHOTON EMISSION
POINT SOURCES
PROBABILITY
PROPER MOTION
STAR CLUSTERS
X RADIATION