J/MNRAS/438/1451 UBVIH{alpha} photometry of IC 1848 (Lim+, 2014) ================================================================================ Sejong Open Cluster Survey (SOS). II. IC 1848 cluster in the HII region W5 West. Lim B., Sung H., Kim J.S., Bessell M.S., Karimov R. =2014MNRAS.438.1451L ================================================================================ ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, H-alpha Keywords: accretion, accretion discs - circumstellar matter - stars: luminosity function, mass function - open clusters and associations: individual: IC 1848 Abstract: IC 1848 is one of the young open clusters in the giant star-forming Cas OB6 association. 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-main-sequence (PMS) stars. A UBVI and H{alpha} photometric study of the young open cluster IC 1848 was conducted as part of the 'Sejong Open Cluster Survey'. We have selected 10^5^ early-type members from photometric diagrams. Their mean reddening is =0.660+/-0.054mag. Using the published photometric data with near- and mid-infrared archival data we confirmed the normal reddening law (R_V_=3.1) towards the cluster (IC 1848). A careful zero-age main-sequence fitting gives a distance modulus of V_0_-M_V_=11.7+/-0.2mag, equivalent to 2.2+/-0.2kpc. H{alpha} 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 H{alpha} emission stars, 35 H{alpha} 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 5Myr from several evolved stars and 3Myr from the PMS stars. The IMF was derived from stars with mass larger than 3M_{sun}_, and the slope is slightly steeper ({Gamma}=-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 1.4x10^-8^M_{sun}_/yr in the mass range of 0.5-2M_{sun}_, whereas intermediate-mass stars (>=2.5M_{sun}_) exhibit a much higher accretion rate of dM/dt>10^-6^M_{sun}/yr. Description: The observations of two regions associated with IC 1848 were made on 2009 January 19 using the AZT-22 1.5-m telescope (f/7.74) at Maidanak Astronomical Observatory in Uzbekistan. All imaging data were acquired using the Fairchild 4098x4098 CCD (SNUCam) with standard Bessell UBVI and H{alpha} filters. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table3.dat 149 15010 Photometric data -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 I5 --- ID [-12/14998] Sequential number (1) 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 17 F5.2 s RAs Right ascension (J2000) 19 A1 --- DE- Declination sign (J2000) 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 29 F4.1 arcsec DEs Declination (J2000) 31- 36 F6.3 mag Vmag [7/22.8]?=- V magnitude 38- 43 F6.3 mag Imag [10/21.1]?=- I magnitude 45- 49 F5.3 mag V-I ?=- V-I colour index 51- 55 F5.3 mag B-V ?=- B-V colour index 57- 62 F6.3 mag U-B ?=- U-B colour index 64- 69 F6.3 mag Ha-C ?=- H{alpha} colour index (C=(V+I)/2) 71- 75 F5.3 mag e_Vmag ?=- rms uncertainty on Vmag 77- 81 F5.3 mag e_Imag ?=- rms uncertainty on Imag 83- 87 F5.3 mag e_V-I ?=- rms uncertainty on V-I 89- 93 F5.3 mag e_B-V ?=- rms uncertainty on B-V 95- 99 F5.3 mag e_U-B ?=- rms uncertainty on U-B 101-105 F5.3 mag e_Ha-C ?=- rms uncertainty on H-C 107 I1 --- o_Vmag Number of observations for Vmag 109 I1 --- o_Imag Number of observations for Imag 111 I1 --- o_V-I Number of observations for V-I 113 I1 --- o_B-V Number of observations for B-V 115 I1 --- o_U-B Number of observations for U-B 117 I1 --- o_Ha-C Number of observations for H-C 119-134 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs) 136 A1 --- Ha [Hh] H{alpha} emission flag (2) 138-149 A12 --- SpT Spectral type for stars -1 to -12 (3) -------------------------------------------------------------------------------- Note (1): The negative numbered ID represents the data from Johnson & Hiltner (1956ApJ...123..267J); Hoag et al. (1961PUSNO..17..343H); Bigay (1963JO.....46..319B); Haug (1970A&AS....1...35H); Hog et al. (2000A&A...355L..27H, Cat. I/259). Note (2): H{alpha} flag is: H = H{alpha} emission stars h = H{alpha} emission star candidates Note (3): Spectral type for stars -1 to -12, from Morgan et al. (1955ApJS....2...41M); Hoag & Applequist (1965ApJS...12..215H); Fehrenbach (1966POHP....8...25F); Conti & Leep (1974ApJ...193..113C); Reed (2003AJ....125.2531R, Cat. V/125); Hillwig et al. (2006ApJ...639.1069H, Cat. J/ApJ/639/1069). -------------------------------------------------------------------------------- History: From electronic version of the journal References: Sung et al., 2013JKAS...46..103S (target selection and data analysis) Sung et al., Paper I 2011JKAS...44...39L (NGC 2353) Lim et al., Paper III 2014MNRAS.443..454L (NGC 1893) Lim et al., Paper IV 2015AJ....149..127L, Cat. J/AJ/149/127 ================================================================================ (End) Patricia Vannier [CDS] 05-Dec-2014