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J/ApJS/230/3        Optical & Spitzer photometry in IC 1805        (Sung+, 2017)

An optical and infrared photometric study of the young open cluster IC 1805 in the giant H II region W4. Sung H., Bessell M.S., Chun M.-Y., Yi J., Naze Y., Lim B., Karimov R., Rauw G., Park B.-G., Hur H. <Astrophys. J. Suppl. Ser., 230, 3-3 (2017)> =2017ApJS..230....3S (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, H-alpha ; Photometry, infrared ; YSOs Keywords: open clusters and associations: individual: IC 1805; stars: formation; stars: pre-main sequence Abstract: We present deep wide-field optical CCD photometry and mid-infrared Spitzer/IRAC and MIPS 24µm data for about 100000 stars in the young open cluster IC 1805. The members of IC 1805 were selected from their location in the various color-color and color-magnitude diagrams, and the presence of Hα emission, mid-infrared excess emission, and X-ray emission. The reddening law toward IC 1805 is nearly normal (RV=3.05±0.06). However, the distance modulus of the cluster is estimated to be 11.9±0.2mag (d=2.4±0.2kpc) from the reddening-free color-magnitude diagrams, which is larger than the distance to the nearby massive star-forming region W3(OH) measured from the radio VLBA astrometry. We also determined the age of IC 1805 (τMSTO=3.5Myr). In addition, we critically compared the age and mass scale from two pre-main-sequence evolution models. The initial mass function with a Salpeter-type slope of Γ=-1.3±0.2 was obtained and the total mass of IC 1805 was estimated to be about 2700±200M. Finally, we found our distance determination to be statistically consistent with the Tycho-Gaia Astrometric Solution Data Release 1, within the errors. The proper motion of the B-type stars shows an elongated distribution along the Galactic plane, which could be explained by some of the B-type stars being formed in small clouds dispersed by previous episodes of star formation or supernova explosions. Description: For a study of the IMF and the star-formation history of the young open cluster IC 1805, we obtained deep wide-field VRI and Hα images of IC 1805 using the CFH12K mosaic CCD camera of the CFHT on 2002 January 6 and 7. We also observed several regions in IC 1805, for a study of the reddening and massive star content, using the SITe 2000x800 CCD (Maidanak 2k CCD) and standard UBVRI filters of the AZT-22 1.5m telescope at the Maidanak Astronomical Observatory in Uzbekistan on 2003 August 18 and 2004 december 25,30. Later, we obtained additional images of the central region of IC 1805 with the Fairchild 486 CCD (SNUCam) and UBVI and Hα filters of the AZT-22 telescope on 2007 October 7 and 2009 January 19. The Spitzer mapping observations were performed on 2006 September 20 under program ID 20052 (PI: S. Wolff). For complete photometry of stars in the CFH12K FOV in 3.6 and 4.5um, we also downloaded and reduced the GLIMPSE360 data (AOR: 38753280, 38763264, 38769408, 38799104, 38798592, 38784512, PI: B. A. Whitney). MIPS scans of IC 1805 were obtained on 2005 August 31 and 2005 September 2 (PID 3234, PI: J. S. Greeves). The Chandra X-ray Observatory Observations of IC 1805 (ObsID: 7033, PI: L. Townley) were made on 2006 November 25. The total exposure time was about 79ks. The properties of 647 X-ray sources were published in Townsley+ (2014,J/ApJS/213/1). We searched for the optical and MIR counterparts of these X-ray sources with a matching radius of up to 1.5". Objects: ------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------ 02 32 42 +61 27.0 IC 1805 = SH 2-190 ------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 168 91139 Photometric data from CFHT observations table5.dat 180 5319 Photometric data from the Maidanak AZT-22 1.5m telescope and SITe 2000x800 CCD table6.dat 180 7011 Photometric data from the Maidanak AZT-22 1.5m telescope and Fairchild 486 CCD (SNUCam) table8.dat 178 101746 Catalog of Spitzer Space Telescope IRAC and MIPS 24um sources
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) III/274 : Galactic O-Star Spectroscopic Survey (Sota+, 2014) J/ApJS/2/389 : Observations of O and B stars (Hiltner, 1956) J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995) J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997) J/AJ/123/2597 : Hα stars and HH objects near BRCs (Ogura+, 2002) J/AJ/127/1014 : CCD UBVRIHa photometry in NGC 3603 (Sung+, 2004) J/AJ/128/1684 : NGC 2264: VRIHα photometry (Sung+, 2004) J/ApJ/639/1069 : Radial velocities in the Cas OB6 association (Hillwig+, 2006) J/AJ/133/1092 : vsini of B0-B3 stars in 7 young clusters (Wolff+, 2007) J/AJ/133/1795 : Globulettes in four HII regions (Gahm+, 2007) J/AJ/135/441 : VRIHα photometry in NGC 2264 (Sung+, 2008) J/AJ/138/1116 : A Spitzer view of NGC 2264 (Sung+, 2009) J/AJ/141/23 : HI holes in THINGS galaxies (Bagetakos+, 2011) J/ApJ/726/19 : Intermediate-mass stars in IC 1805 (Wolff+, 2011) J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012) J/A+A/553/A24 : Models for rotating stars (Georgy+, 2013) J/A+A/554/A3 : Vilnius photometry of IC1805 stars (Straizys+, 2013) J/AJ/145/37 : UBVI and Hα CCD photometry of NGC 6231 (Sung+, 2013) J/ApJS/213/1 : The MSFRs Omnibus X-ray Catalog (MOXC) (Townsley+, 2014) J/ApJ/822/49 : Candidate YSOs in AFGL 333 with NEWFIRM+Spitzer (Jose+, 2016) J/A+A/594/A82 : XMM sources in IC 1805 (Rauw+, 2016) http://sha.ipac.caltech.edu/applications/Spitzer/SHA/ : Spitzer archive Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 A6 --- CFHT Optical sequence number for 3.6m CFHT+CFH12K observations (CNNNNN) 8 I1 h RAh [2] Hour of Right Ascension (J2000) 10- 11 I2 min RAm [29/35] Minute of Right Ascension (J2000) 13- 17 F5.2 s RAs Second of Right Ascension (J2000) 19 A1 --- DE- [+] Sign of Declination (J2000) 20- 21 I2 deg DEd [61] Degree of Declination (J2000) 23- 24 I2 arcmin DEm [3/49] Arcminute of Declination (J2000) 26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000) 31- 36 F6.3 mag Vmag [11.2/25]? CFHT/CFH12K V band magnitude 38- 43 F6.3 mag Imag [11.7/23]? CFHT/CFH12K I band magnitude 45- 50 F6.3 mag (R-I) [-1.3/2.8]? CFHT/CFH12K (R-I) color index 52- 57 F6.3 mag (V-I) [-0.8/5.1]? CFHT/CFH12K (V-I) color index 59- 64 F6.3 mag (R-Ha) [-4.6/0]? CFHT/CFH12K (R-Halpha) color index 66- 70 F5.3 mag e_Vmag [0/0.8]? Uncertainty in Vmag 72- 76 F5.3 mag e_Imag [0/0.7]? Uncertainty in Imag 78- 82 F5.3 mag e_(R-I) [0/0.9]? Uncertainty in (R-I) 84- 88 F5.3 mag e_(V-I) [0/0.9]? Uncertainty in (V-I) 90- 94 F5.3 mag e_(R-Ha) [0/0.7]? Uncertainty in (R-Halpha) 96- 97 I2 --- o_Vmag [0/11] Number of Vmag observations 99-100 I2 --- o_Imag [0/11] Number of Imag observations 102-103 I2 --- o_(R-I) [0/11] Number of (R-I) observations 105-106 I2 --- o_(V-I) [0/11] Number of (V-I) observations 108 I1 --- o_(R-Ha) [0/7] Number of (R-Halpha) observations 110 A1 --- Dup [DG] Duplicity flags (G1) 112 A1 --- Mm Membership flags (G2) 114-115 A2 --- Cl YSO Class (G3) 117-132 A16 --- 2MASS 2MASS Crossmatch ID (HHMMSSss+DDMMSSs; J2000) 133 A1 --- m_2MASS [A-Cb] Multiple counterparts (G4) 135-141 A7 --- Spitzer Spitzer (as in table 8) Crossmatch ID 142 A1 --- m_Spitzer [A-D] Multiple counterparts (1) 144-147 A4 --- VSA ? Vasilevskis+ (1965AJ.....70..806V) ID; <IC 1805 NNN> in Simbad 149-168 A20 --- SpT MK spectral type
Note (1): A, B, or C are added at the end of Spitzer ID if two or more stars are matched with a Spitzer source within a matching radius of 1 arcsec.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 7 A7 --- M2k Optical sequence number for AZT-22 1.5m + SITe obs (M2kNNNN) 9 I1 h RAh [2] Hour of Right Ascension (J2000) 11- 12 I2 min RAm [29/35] Minute of Right Ascension (J2000) 14- 18 F5.2 s RAs Second of Right Ascension (J2000) 20 A1 --- DE- [+] Sign of Declination (J2000) 21- 22 I2 deg DEd [61] Degree of Declination (J2000) 24- 25 I2 arcmin DEm [13/41] Arcminute of Declination (J2000) 27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000) 32- 37 F6.3 mag Vmag [8.4/21.5]? Maidanak AZT-22 1.5m/SITe V band magnitude 39- 44 F6.3 mag Imag [8.4/20]? Maidanak AZT-22 1.5m/SITe I band magnitude 46- 50 F5.3 mag (R-I) [0.1/2.5]? Maidanak AZT-22 1.5m/SITe (R-I) color index 52- 56 F5.3 mag (V-I) [0.4/5.3]? Maidanak AZT-22 1.5m/SITe (V-I) color index 58- 63 F6.3 mag (B-V) [-0.8/3.1]? Maidanak AZT-22 1.5m/SITe (B-V) color index 65- 70 F6.3 mag (U-B) [-0.7/21]? Maidanak AZT-22 1.5m/SITe (U-B) color index 72- 76 F5.3 mag e_Vmag [0/0.5]? Uncertainty in Vmag 78- 82 F5.3 mag e_Imag [0/0.4]? Uncertainty in Imag 84- 88 F5.3 mag e_(R-I) [0/0.4]? Uncertainty in (R-I) 90- 94 F5.3 mag e_(V-I) [0/0.7]? Uncertainty in (V-I) 96-100 F5.3 mag e_(B-V) [0/1]? Uncertainty in (B-V) 102-106 F5.3 mag e_(U-B) [0/0.3]? Uncertainty in (U-B) 108 I1 --- o_Vmag [0/4] Number of Vmag observations 110 I1 --- o_Imag [0/4] Number of Imag observations 112 I1 --- o_(R-I) [0/4] Number of (R-I) observations 114 I1 --- o_(V-I) [0/4] Number of (V-I) observations 116 I1 --- o_(B-V) [0/4] Number of (B-V) observations 118 I1 --- o_(U-B) [0/4] Number of (U-B) observations 120 A1 --- Dup [DG] Duplicity flags (G1) 122 A1 --- Mm Membership flags (G2) 124 A1 --- Cl YSO Class (G3) 126-141 A16 --- 2MASS 2MASS Crossmatch ID (HHMMSSss+DDMMSSs; J2000) 142 A1 --- m_2MASS [ABb] Multiple counterpart (G4) 144-163 A20 --- CFHT CFHT (as in table 2) Crossmatch ID(s) (G5) 165 A1 --- n_CFHT Membership flag for CFHT (G5)(G2) 167-169 I3 --- VSA [39/302]? Vasilevskis+ (1965AJ.....70..806V) ID; <IC 1805 NNN> in Simbad 171-180 A10 --- SpT MK spectral type
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 7 A7 --- M4K Optical sequence number for AZT-22 1.5m + SNUCam obs (M4kNNNN) 9 I1 h RAh [2] Hour of Right Ascension (J2000) 11- 12 I2 min RAm [31/34] Minute of Right Ascension (J2000) 14- 18 F5.2 s RAs Second of Right Ascension (J2000) 20 A1 --- DE- [+] Sign of Declination (J2000) 21- 22 I2 deg DEd [61] Degree of Declination (J2000) 24- 25 I2 arcmin DEm [20/39] Arcminute of Declination (J2000) 27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000) 32- 37 F6.3 mag Vmag [9.4/23.1]? Maidanak AZT-22 1.5m/SNUCam V band magnitude 39- 44 F6.3 mag Imag [9.3/20.5]? Maidanak AZT-22 1.5m/SNUCam I band magnitude 46- 50 F5.3 mag (V-I) [0.4/4.5]? Maidanak AZT-22 1.5m/SNUCam V-I color index 52- 56 F5.3 mag (B-V) [0.3/3.1]? Maidanak AZT-22 1.5m/SNUCam B-V color index 58- 63 F6.3 mag (U-B) [-2.7/2.3]? Maidanak AZT-22 1.5m/SNUCam U-B color index 65- 70 F6.3 mag Hamag [-2.4/0.8]? Maidanak AZT-22 1.5m/SNUCam Hα magnitude 72- 76 F5.3 mag e_Vmag [0/0.6]? Uncertainty in Vmag 78- 82 F5.3 mag e_Imag [0/0.5]? Uncertainty in Imag 84- 88 F5.3 mag e_(V-I) [0/0.4]? Uncertainty in (V-I) 90- 94 F5.3 mag e_(B-V) [0/0.6]? Uncertainty in (B-V) 96-100 F5.3 mag e_(U-B) [0/0.4]? Uncertainty in (U-B) 102-106 F5.3 mag e_Hamag [0/0.5]? Uncertainty in Halpha 108 I1 --- o_Vmag [0/4] Number of Vmag observations 110 I1 --- o_Imag [0/4] Number of Imag observations 112 I1 --- o_(V-I) [0/4] Number of (V-I) observations 114 I1 --- o_(B-V) [0/4] Number of (B-V) observations 116 I1 --- o_(U-B) [0/4] Number of (U-B) observations 118 I1 --- o_Hamag [0/4] Number of Halpha observations 120 A1 --- Dup [DG] Duplicity flags (G1) 122 A1 --- Mm Membership flags (G2) 124 A1 --- Cl YSO Class (G3) 126-141 A16 --- 2MASS 2MASS Crossmatch ID (HHMMSSss+DDMMSSs; J2000) 142 A1 --- m_2MASS [ABb] Multiple counterpart (G4) 144-163 A20 --- CFHT CFHT (as in table 2) Crossmatch ID(s) (G5) 165-167 A3 --- n_CFHT Membership flag(s) for CFHT (G5)(G2) 169-171 I3 --- VSA [94/243]? Vasilevskis+ (1965AJ.....70..806V) ID; <IC 1805 NNN> in Simbad 173-180 A8 --- SpT MK spectral type
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Spitzer Spitzer ID (SNNNNN) 9 I1 h RAh [2] Hour of Right Ascension (J2000) 11- 12 I2 min RAm [27/37] Minute of Right Ascension (J2000) 14- 18 F5.2 s RAs Second of Right Ascension (J2000) 20 A1 --- DE- [+] Sign of Declination (J2000) 21- 22 I2 deg DEd [60/62] Degree of Declination (J2000) 24- 25 I2 arcmin DEm Arcminute of Declination (J2000) 27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000) 32- 37 F6.3 mag [3.6]mag [5.4/18.3]? Spitzer/IRAC 3.6um magnitude 39- 44 F6.3 mag [4.5]mag [5/18.1]? Spitzer/IRAC 4.5um magnitude 46- 51 F6.3 mag [5.8]mag [4.6/16]? Spitzer/IRAC 5.8um magnitude 53- 58 F6.3 mag [8.0]mag [5.4/15]? Spitzer/IRAC 8.0um magnitude 60- 64 F5.3 mag [24]mag [1/10]? Spitzer/MIPS 24um magnitude 66- 70 F5.3 mag e_[3.6]mag [0/0.8]? Uncertainty in [3.6]mag 72- 76 F5.3 mag e_[4.5]mag [0/1.2]? Uncertainty in [4.5]mag 78- 82 F5.3 mag e_[5.8]mag [0/0.6]? Uncertainty in [5.8]mag 84- 88 F5.3 mag e_[8.0]mag [0/0.4]? Uncertainty in [8.0]mag 90- 94 F5.3 mag e_[24]mag [0/0.3]? Uncertainty in [24]mag 96 I1 --- o_[3.6]mag [0/6] Number of [3.6]mag observations 98 I1 --- o_[4.5]mag [0/6] Number of [4.5]mag observations 100 I1 --- o_[5.8]mag [0/2] Number of [5.8]mag observations 102 I1 --- o_[8.0]mag [0/2] Number of [8.0]mag observations 104 I1 --- o_[24]mag [0/5] Number of [24]mag observations 106-108 A3 --- Dup Duplicity flags (G1) 110 A1 --- Cl YSO Class (G3) 112 A1 --- Mm Membership flags (G2) 114-129 A16 --- 2MASS 2MASS Crossmatch ID (HHMMSSss+DDMMSSs; J2000) 130 A1 --- m_2MASS [ABb] Multiple counterpart (G4) 132-178 A47 --- Optical Optical Counterparts from Tables 2,5,6
Global notes: Note (G1): Duplicity flags as follows: D = stars whose PSF shows a double, but measures as a single star; C = stars whose PSF in the optical image shows a double, but measures as a single star; d = stars with two optical counterparts within a matching radius of 1 arcsec; t = stars with three optical counterparts within a matching radius of 1 arcsec; G = galaxy from optical image. Note (G2): Membership flag as follows: X = X-ray emission star; x = X-ray emission candidate; H = Hα emission star; h = Hα emission candidate; + = X + H; - = X + h. Note (G3): YSO class as follows: 1 = Class I; F = flat spectrum; 2 = Class II; 3 = Class III; 4 = Class IV; t = star with pre-transition disks; T = star with transition disks; P = stars with PAH emission; g = photometric galaxy candidates; ? = Two or more stars are identified as the optical counter parts of a Spitzer source. Note (G4): A, B, or b are added at the end of 2MASS ID if two or more stars are matched with a 2MASS source within a matching radius of 1 arcsec. A or B = The bright or faint component of a 2MASS source whose I magnitude difference is less than 1 mag. b = The faint component of a 2MASS source whose I magnitude difference is greater than 1 mag. Note (G5): CFHT ID in Table 2. Membership from CFHT observation is indicated in the n_CFHT column.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Jun-2017
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