ANU Open Research Repository has been upgraded. We are still working on a few minor issues, which may result in short outages throughout the day. Please get in touch with repository.admin@anu.edu.au if you experience any issues.
 

Sejong open cluster survey (SOS) - II. IC 1848 cluster in the H II region W5 west

Date

2014

Authors

Lim, Beomdu
Sung, Hwankyung
Kim, Jinyoung S.
Bessell, Michael
Karimov, Rivkat

Journal Title

Journal ISSN

Volume Title

Publisher

Blackwell Publishing Ltd

Abstract

IC 1848 is one of the young open clusters in the giant star-formingCas OB6association. Several interesting aspects relating to star formation processes in giant star-forming regions attracted us to study the initial mass function (IMF), star formation mode and properties of pre-mainsequence (PMS) stars. A UBVI and Hα photometric study of the young open cluster IC 1848 was conducted as part of the 'Sejong Open Cluster Surve'y. We have selected 105 earlytype members from photometric diagrams. Their mean reddening is (E(B-V))=0.660±0.054 mag. Using the published photometric data with near-and mid-infrared archival data we confirmed the normal reddening law (RV = 3.1) towards the cluster (IC 1848). A careful zero-age main-sequence fitting gives a distance modulus of V0-MV = 11.7±0.2mag, equivalent to 2.2± 0.2 kpc. Hα photometry and the list of young stellar objects identified by Koenig et al. permitted us to select a large number of PMS stars comprising 196 Hα emission stars, 35 Hα emission candidates, 5 Class I, 368 Class II and 24 transition disc candidates. From the Hertzsprung-Russell diagram using stellar evolution models, we estimate an age of 5 Myr from several evolved stars and 3 Myr from the PMS stars. The IMF was derived from stars with mass larger than 3⊙, and the slope is slightly steeper (Γ = -1.6±0.2) than the Salpeter/Kroupa IMF. Finally, we estimated the mass accretion rate of PMS stars with an ultraviolet excess. The mean mass accretion rate is about 1.4×10-8M⊙yr-1 in the mass range of 0.5-2M⊙ whereas intermediate-mass stars (≥=2.5M⊙) exhibit a much higher accretion rate of M>10-6M⊙yr-1.

Description

Keywords

Citation

Source

Monthly Notices of the Royal Astronomical Society

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

DOI

10.1093/mnras/stt2283

Restricted until