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J/ApJS/194/6     Candidate X-ray emitting OB stars in Carina     (Povich+, 2011)

Candidate X-ray-emitting OB stars in the Carina nebula identified via infrared spectral energy distributions. Povich M.S., Townsley L.K., Broos P.S., Gagne M., Babler B.L., Indebetouw R., Majewski S.R., Meade M.R., Getman K.V., Robitaille T.P., Townsend R.H.D. <Astrophys. J. Suppl. Ser., 194, 6 (2011)> =2011ApJS..194....6P
ADC_Keywords: Stars, OB ; Extinction ; Photometry, infrared ; X-ray sources Cross identifications Keywords: infrared: stars - ISM: individual objects (NGC 3372) - methods: data analysis - stars: early-type - X-rays: stars Abstract: We report the results of a new survey of massive, OB stars throughout the Carina Nebula using the X-ray point source catalog provided by the Chandra Carina Complex Project (CCCP) in conjunction with infrared (IR) photometry from the Two Micron All-Sky Survey and the Spitzer Space Telescope Vela-Carina survey. Mid-IR photometry is relatively unaffected by extinction, hence it provides strong constraints on the luminosities of OB stars, assuming that their association with the Carina Nebula, and hence their distance, is confirmed. We fit model stellar atmospheres to the optical (UBV) and IR spectral energy distributions (SEDs) of 182 OB stars with known spectral types and measure the bolometric luminosity and extinction for each star. Using X-ray emission as a strong indicator of association with Carina, we identify 94 candidate OB stars with Lbol≳104L by fitting their IR SEDs. If the candidate OB stars are eventually confirmed by follow-up spectroscopic observations, the number of cataloged OB stars in the Carina Nebula will increase by ∼50%. Description: We used data products from the Chandra Carina Complex Project (CCCP; Townsley et al. 2011ApJS..194....1T), Two-Micron All Sky Survey (2MASS; Skrutskie et al. 2006, Cat. VII/233), and the Spitzer Vela-Carina Survey (PI: S. R. Majewski), as described in Povich et al. 2011, Cat. J/ApJS/194/14. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 97 182 Validation sample of cataloged Carina OB stars: SED-fitting results and IR photometry table3.dat 120 94 Candidate X-ray-emitting OB stars
See also: VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) III/182 : HDE Charts: positions, proper motions (Nesterov+ 1995) J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011) J/ApJS/194/5 : Carina OB stars in the CCCP catalog (Gagne+, 2011) J/ApJS/194/14 : Pan-Carina young stellar object catalog (Povich+, 2011) J/A+A/477/593 : X-ray properties of Carina OB1 association (Antokhin+, 2008) J/ApJ/667/963 : Near-infrared photometry of Carina nebula (Sanchawala+, 2007) J/ApJ/589/509 : Chandra observations of Trumpler 14 and 16 (Evans+, 2003) J/AJ/105/1822 : Open clusters near eta Car (Cudworth+ 1993) J/AJ/105/980 : Stellar content of Tr 14 and Tr 16 (Massey+ 1993) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 A11 --- Name Star name from Gagne, 2011, Cat. J/ApJS/194/5 13- 16 F4.2 mag AvBV ? BV Extinction from Gagne 2011, Cat. J/ApJS/194/5 18- 21 F4.1 kK Teff Effective temperature (1) 23- 26 F4.2 [Lsun] logLbol Bolometric luminosity 28- 31 F4.2 mag Av Extinction from SED fitting 33- 49 A17 --- SSTGLMA SSTGLMA name (GLLL.llll+BB.bbbb) (G1) 51- 55 F5.2 mag Jmag ? 2MASS J-band magnitude 57- 61 F5.2 mag Hmag ? 2MASS H-band magnitude 63- 67 F5.2 mag Ksmag ? 2MASS Ks-band magnitude 69- 73 F5.2 mag [3.6] ? Spitzer/IRAC 3.6um band magnitude 75- 79 F5.2 mag [4.5] ? Spitzer/IRAC 4.5um band magnitude 81- 85 F5.2 mag [5.8] ? Spitzer/IRAC 5.8um band magnitude 87- 91 F5.2 mag [8.0] ? Spitzer/IRAC 8.0um band magnitude 93- 97 A5 --- IREx IR excess emission? (2)
Note (1): From the Martins et al. (2005A&A...436.1049M) calibrations of Teff vs. spectral type for O stars, extended to early B stars by Crowther (2005IAUS..227..389C). Spectral types were compiled from various sources by Gagne, 2011, Cat. J/ApJS/194/5. Note (2): Source exhibits marginal IR excess emission in the specified IRAC band(s) are indicated with I2=4.5um, I3=5.8um, I4=8.0um.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq OB candidate number 3 A1 --- f_Seq [f] X-ray flare for candidate 41 (1) 5- 22 A18 --- CXOGNC CXOGNC designation (; J2000)(2) 24- 27 F4.1 kK Teff Effective temperature (3) 29- 31 F3.1 [Lsun] logLbol Bolometric luminosity (3) 33- 36 F4.1 mag Av Extinction (3) 38- 54 A17 --- SSTGLMA SSTGLMA name (GLLL.llll+BB.bbbb) (G1) 56- 60 F5.2 mag Jmag ? 2MASS J-band magnitude 62- 66 F5.2 mag Hmag ? 2MASS H-band magnitude 68- 72 F5.2 mag Ksmag 2MASS Ks-band magnitude 74- 78 F5.2 mag [3.6] ? Spitzer/IRAC 3.6um band magnitude 80- 84 F5.2 mag [4.5] ? Spitzer/IRAC 4.5um band magnitude 86- 90 F5.2 mag [5.8] ? Spitzer/IRAC 5.8um band magnitude 92- 96 F5.2 mag [8.0] ? Spitzer/IRAC 8.0um band magnitude 98-120 A23 --- Note Previous identification(s); spectral types or IR excess (4)
Note (1): the OB candidate 41 appears to be responsible for the spectacular X-ray flare discovered by Townsley et al. (2011ApJS..194....1T). Note (2): CCCP Catalog identifier (Broos et al. 2011, Cat. J/ApJS/194/2) Note (3): Values in Columns 3-5 were derived from SED fitting under the assumption of single massive stars on the theoretical zero-age main sequence (see the text). Formally, TMSeff, LMSbol, and AMSV reported here are upper limits and should be used only for comparison purposes among this sample. Note (4): Abbreviations for previous star identifications are: HD = Nesterov et al. (1995, Cat. III/182); Y = Cudworth et al. (1993, Cat. J/AJ/105/1822; <Cl* Trumpler 14 Y NNN> in Simbad); Cr 228 = Collinder 228: Feinstein et al. (1976A&AS...24..389F; <Cl Collinder 228 NN> in Simbad) or The et al. (1980A&AS...41...93T); IRS = Smith (1987MNRAS.227..943S; <[S87b] IRS NNa> in Simbad); MJ = Massey & Johnson (1993, Cat. J/AJ/105/980; <Cl* Trumpler 1[46] MJ NNN> in Simbad); XMM = Antokhin et al. (2008, Cat. J/A+A/477/593; <[ARV2008] NNN> in Simbad) Bo 11 = Bochum 11: Fitzgerald & Mehta (1987MNRAS.228..545F); LS = Stephenson & Sanduleak (1971PW&SO...1a...1S). OB = Candidate massive stars (Evans et al. 2003, Cat. J/ApJ/589/509) PMS = Candidate low-mass PMS stars (Sanchawala et al. 2007, Cat. J/ApJ/667/963) NOP = Star was not found in any of optical photometric catalogs listed by VizieR (Ochsenbein et al. 2000A&AS..143...23O). PFD = Candidate OB star is also consistent with a foreground MS classification. I3 = Source exhibits marginal IR excess emission in the IRAC 5.8um band.
Global notes: Note (G1): Spitzer Vela-Carina Point Source Archive identification (described in Povich et al. 2011, Cat. J/ApJS/194/14).
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) Emmanuelle Perret [CDS] 25-May-2011
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