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J/ApJS/194/11        Chandra study of Trumpler 15 in Carina        (Wang+, 2011)

A Chandra ACIS study of the young star cluster Trumpler 15 in Carina and correlation with near-infrared sources. Wang J., Feigelson E.D., Townsley L.K., Broos P.S., Getman K.V., Wolk S.J., Preibisch T., Stassun K.G., Moffat A.F.J., Garmire G., King R.R., McCaughrean M.J., Zinnecker H. <Astrophys. J. Suppl. Ser., 194, 11 (2011)> =2011ApJS..194...11W
ADC_Keywords: Associations, stellar ; X-ray sources Keywords: ISM: individual objects (Great Nebula in Carina) - open clusters and associations: individual (Trumpler 15) - stars: pre-main sequence - X-rays: stars Abstract: Using the highest-resolution X-ray observation of the Trumpler 15 star cluster taken by the Chandra X-ray Observatory, we estimate the total size of its stellar population by comparing the X-ray luminosity function (XLF) of the detected sources to a calibrator cluster and identify for the first time a significant fraction (∼14%) of its individual members. The highest-resolution near-IR observation of Trumpler 15 (taken by the HAWK-I instrument on the Very Large Telescope) was found to detect most of our X-ray selected sample of cluster members, with a K-excess disk frequency of 3.8%±0.7%. The near-IR data, XLF, and published spectral types of the brightest members support a cluster age estimate (5-10Myr) that is older than those for the nearby Trumpler 14 and Trumpler 16 clusters, and suggest that high-mass members may have already exploded as supernovae. The morphology of the inner ∼0.7pc core of the cluster is found to be spherical. However, the outer regions (beyond ∼2pc) are elongated, forming an "envelope" of stars that, in projection, appears to connect Trumpler 15 to Trumpler 14; this morphology supports the view that these clusters are physically associated. Clear evidence of mass segregation is seen. This study appears in this special issue devoted to the Chandra Carina Complex Project, a 1.42deg2 Chandra X-ray survey of the Great Nebula in Carina. Description: Trumpler 15 was observed as part of the CCCP (Townsley et al., 2011ApJS..194....1T), a large mosaic of Chandra Advanced CCD Imaging Spectrometer I-array (ACIS-I) observations. One CCCP pointing (ObsID 9484, a 60ks integration obtained on 2008 August 19) is centered on Trumpler 15; five other pointings cover the edges of the cluster (Figure 1(a)). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 54 841 Properties of Chandra ACIS point sources in the Trumpler 15 region
See also: B/chandra : The Chandra Archive Log (CXC, 1999-) J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011) J/ApJS/194/4 : A Naive Bayes source classifier for X-ray sources (Broos+, 2011) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- CCCP CCCP X-ray catalog sequence number (1) 6- 23 A18 --- CXOGNC IAU designation (; J2000) 25- 34 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 36- 45 F10.6 deg DEdeg Declination in decimal degrees (J2000) 47- 51 F5.1 ct NCts Net total 0.5-8keV X-ray events detected (2) 53- 54 A2 --- Class Classification (3)
Note (1): Notes/other names from SIMBAD queries using a 2" matching radius: 6860 = Cl Trumpler 15 20=GSC 08626-00886=GEN# +4.35150020; 6907 = Cl Trumpler 15 19=Cl* Trumpler 15 C 28=GEN# +4.35150019; 7023 = Cl Trumpler 15 21=Cl* Trumpler 15 C 44=GEN# +4.35150021; 7195 = Cl Trumpler 15 8=GSC 08626-01516=GEN# +4.35150008; 7318 = Cl Trumpler 15 15=CPD-58 2656=Cl* Trumpler 15 C 3= GSC 08626-01303=GEN# +4.35150015=TYC 8626-1303-1; 7332 = Cl Trumpler 15 6=NSV 18508; 7397 = Cl Trumpler 15 2=CCDM J10447-5921B=Cl* Trumpler 15 C 2= GSC 08626-02845=GEN# +4.35150002; 7403 = Cl Trumpler 15 1=HD 93249=ALS 1857=1E 1042.7-5905=SAO 238421= CCDM J10447-5921A=GEN# +4.35150001J; 7584 = Cl Trumpler 15 10=Cl* Trumpler 15 C 17 =CPD-58 2662= GSC 08626-01107 =GEN# +4.35150010; 7679 = Cl Trumpler 15 12=GSC 08626-01694 = GEN# +4.35150012; 7696 = Cl Trumpler 15 38 = GEN# +4.35150038=2MASS J10444861-5922153; 7756 = Cl Trumpler 15 29 = GSC 08626-01760 = GEN# +4.35150029; 8235 = Cl Trumpler 15 31 = GEN# +4.35150031; 8503 = Cl Trumpler 15 35 = GEN# +4.35150035=2MASS J10450167-5923382; 8554 = Cl Trumpler 15 34 = GEN# +4.35150034=2MASS J10450269-5922019. CCCP sources in Simbad are <[BTF2011] CCCP NNNNN> or <CXOGNC> Note (2): In the source extraction aperture, taken from Table 1 in Broos et al. (2011, Cat. J/ApJS/194/2) with the column name "NCt-t". Note (3): A set of mutually exclusive classification hypotheses defined for each source in Broos et al. (2011, Cat. J/ApJS/194/4) as follows: H0 = source is unclassified; H1 = source is a foreground main-sequence star; H2 = source is a young star, assumed to be in the Carina complex; H3 = source is a Galactic background main-sequence star; H4 = source is extragalactic.
History: From electronic version of the journal References: Townsley et al. CCCP introduction 2011ApJS..194....1T Broos et al. CCCP catalog Cat. J/ApJS/194/2 Getman et al. Contamination in X-ray studies 2011ApJS..194....3G Broos et al. Source classifier Cat. J/ApJS/194/4 Gagne et al. O and B stars Cat. J/ApJS/194/5 Povich et al. Cand. X-ray emitting OB stars Cat. J/ApJS/194/6 Naze et al. O and B stars X-ray properties Cat. J/ApJS/194/7 Parkin et al. QZ Car (HD 93206) 2011ApJS..194....8P Feigelson et al. X-ray star clusters Cat. J/ApJS/194/9 Preibisch et al. NIR properties of YSO Cat. J/ApJS/194/10 Wang et al. Trumpler 15 Cat. J/ApJS/194/11 Wolk et al. Trumpler 16 Cat. J/ApJS/194/12 Povich et al. Pan-Carina YSO catalog Cat. J/ApJS/194/14 Evans et al. Companions of B stars in Tr 16 2011ApJS..194...13E Townsley et al. Diffuse X-ray emission Cat. J/ApJS/194/15 Townsley et al. Comparison of diffuse emission 2011ApJS..194...16T
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 26-May-2011
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