J/ApJS/209/32     Probable young stars in the MYStIX project     (Broos+, 2013)
================================================================================
Identifying young stars in massive star-forming regions for the MYStIX project.
    Broos P.S., Getman K.V., Povich M.S., Feigelson E.D., Townsley L.K.,
    Naylor T., Kuhn M.A., King R.R., Busk H.A.
   <Astrophys. J. Suppl. Ser., 209, 32 (2013)>
   =2013ApJS..209...32B
================================================================================
ADC_Keywords: Photometry, infrared ; X-ray sources ; YSOs ;
              Cross identifications ; H II regions ; Clusters, open
Keywords: infrared: stars - methods: data analysis - methods: statistical -
          open clusters and associations: general - stars: pre-main sequence -
          X-rays: general - X-rays: stars

Abstract:
    The Massive Young star-forming complex Study in Infrared and X-rays
    (MYStIX) project requires samples of young stars that are likely
    members of 20 nearby Galactic massive star-forming regions. Membership
    is inferred from statistical classification of X-ray sources, from
    detection of a robust infrared excess that is best explained by
    circumstellar dust in a disk or infalling envelope and from published
    spectral types that are unlikely to be found among field stars. We
    present the MYStIX membership lists here, and describe in detail the
    statistical classification of X-ray sources via a "Naive Bayes
    Classifier."

Description:
    The Massive Young star-forming complex Study in Infrared and X-rays
    (MYStIX) project, described by Feigelson et al. (2013ApJS..209...26F),
    seeks to identify and study samples of young stars in 20 nearby
    (0.4<d<3.6kpc) Galactic massive star-forming regions (MSFRs). These
    samples are derived using X-ray data from the Chandra X-ray
    Observatory, near-infrared (NIR) photometry from the United Kingdom
    InfraRed Telescope (UKIRT) and from the Two Micron All Sky Survey
    (2MASS), mid-infrared (MIR) photometry from the Spitzer Space
    Telescope, and published spectroscopically identified massive stars.
    Our purpose here is to describe our efforts to minimize contaminants
    in the MYStIX catalogs of young stars, which we refer to as "MYStIX
    Probable Complex Members" (MPCMs), and to present the MPCM catalog for
    each MYStIX MSFR. An MPCM catalog is the union of three sets of
    probable members identified by three established methods for
    identifying young stars (Feigelson et al. 2013ApJS..209...26F, Fig. 3).

File Summary:
--------------------------------------------------------------------------------
 FileName   Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe         80        .   This file
reg.dat        22       20   List of the 20 nearby Galactic massive
                              star-forming regions; table added by CDS
mpcm.dat      971    31549   MPCM (MYStIX Probable Complex Members) sources
                               and properties (table 2)
table7.dat    491    25277   Counterparts to X-ray sources and classification
                               probabilities
refs.dat       97       42   References
--------------------------------------------------------------------------------

See also:
 B/chandra : The Chandra Archive Log (CXC, 1999-2013)
 B/mk      : Catalogue of Stellar Spectral Classifications (Skiff, 2009-2013)
 II/293    : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
 II/246    : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
 J/ApJS/209/31   : The MYStIX IR-Excess Source catalog (Povich+, 2013)
 J/ApJS/209/30   : MYStIX: Bayesian matching (Naylor+, 2013)
 J/ApJS/209/29   : MYStIX: MIR observations and catalogs (Kuhn+, 2013)
 J/ApJS/209/28   : MYStIX Wide-Field NIR data: crowded fields (King+, 2013)
 J/ApJS/209/27   : MYStIX: the Chandra X-ray sources (Kuhn+, 2013)
 J/ApJS/194/14   : A Pan-Carina YSO catalog (Povich+, 2011)
 J/ApJS/194/10   : NIR properties of YSO in the CCCP (Preibisch+, 2011)
 J/ApJS/194/5    : Carina OB stars in the CCCP catalog (Gagne+, 2011)
 J/ApJS/194/4    : Classification of CCCP X-ray sources (Broos+, 2011)
 J/ApJS/194/2    : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011)
 J/ApJ/714/L285  : YSO candidates in M17 SWex (Povich+, 2010)
 J/ApJ/708/1760  : Flux estimations of faint X-ray sources (Getman+, 2010)
 J/ApJ/696/1278  : The extended star-forming environment of M17 (Povich+, 2009)
 J/MNRAS/384/675 : Monitoring low-mass stars in NGC 2362 (Irwin+ 2008)
 J/ApJS/169/353  : Chandra sources in M17 (Broos+, 2007)
 J/ApJS/168/100  : X-ray study of star-forming region NGC 6357 (Wang+, 2007)
 J/ApJ/671/605   : NGC 2264 and ONC PMS stars in the infrared (Cieza+, 2007)
 J/ApJ/642/972   : IR phot. of a star-forming core in NGC 2264 (Young+, 2006)
 J/MNRAS/371/252 : Southern B and Be stars (Levenhagen+, 2006)
 J/ApJS/160/353  : Membership of the Orion nebula population (Getman+, 2005)
 J/ApJS/160/319  : COUP: observations and source lists (Getman+, 2005)
 J/AJ/130/1145   : YSO near-infrared properties (Doppmann+, 2005)
 J/ApJ/562/446   : X-rays and protostars in Trifid nebula (Rho+, 2001)
 J/A+A/355/651   : HRI observations of PMS stars in NGC 2264 (Flaccomio+, 2000)

Byte-by-byte Description of file: reg.dat
--------------------------------------------------------------------------------
   Bytes  Format Units    Label  Explanations
--------------------------------------------------------------------------------
   1- 16  A16   ---       Name   MYStIX Galactic massive star-forming region
                                  (MSFR) name
  18- 22  A5    ---       Reg    Abbreviated region name
--------------------------------------------------------------------------------

Byte-by-byte Description of file: mpcm.dat
--------------------------------------------------------------------------------
  Bytes  Format Units     Label  Explanations
--------------------------------------------------------------------------------
   1- 16  A16   ---       Reg    MYStIX Galactic massive star-forming region
                                  (MSFR) name
  18- 35  A18   ---       MPCM   IAU source name (HHMMSS.ss+DDMMSS.s; J2000)
      36  A1    ---     m_MPCM   [ab] Multiple MPCM name component (1)
  38- 47  F10.6 deg       RAdeg  Right Ascension (J2000)
  49- 58  F10.6 deg       DEdeg  Declination (J2000)
  60- 64  F5.3  arcsec    ePos   [0/2.1]?=- 1{sigma} error around (RA,DE)
  66- 76  A11   ---       rPos   Origin of position (G1)
  78- 95  A18   ---       CXO    X-ray source name in IAU format
                                  (HHMMSS.s+DDMMSS; J2000)
  97-107  A11   ---       Xlab   X-ray source name used within the MYStIX
                                  project (G2)
 109-126  A18   ---       NName  Name in NIR catalog (G3)
 128-143  A16   ---       Nlab   Label in NIR catalog
 145-162  A18   ---       MName  Name in MIR catalog
                                  (HHMMSS.ss+DDMMSS.s; J2000 or NNNN) (G4)
 164-192  A29   ---       Mlab   Label in MIR catalog
 194-223  A30   ---       Olab   Label in OB catalog (2)
 225-229  I5    ---       Xind   ?=-99 0-based index in X-ray catalog (Sec. 4)
 231-234  I4    ---       Iind   ?=-99 0-based index in IR excess catalog
                                  (Povich et al. 2013, Cat. J/ApJS/209/31)
 236-265  A30   ---       SpT    MK spectral type
 267-280  A14   ---     r_SpT    Reference for spectral type (3)
 282-287  F6.3  mag       OBmag  [4.4/24.5]? Visual photometry in OB Catalog
 289-291  A3    ---       OBband Visual band for OBmag (J, K or V)
 293-296  F4.2  ---       pr.0   [0/1]? p-value for no-source hypothesis (4)(5)
 298-301  F4.2  ---       pr.1   [0/1]? p-value for single observation (4)(6)
 303-306  F4.2  ---       pr.m   [0/1]? p-value for merged observations (4)(6)
 308-316  F9.2  s         t.exp  ? Total exposure time in merged
                                   observations (4)
 318-321  F4.2  ---       f.exp  [0/1]? Fraction of "Exp" that source was
                                   observed (4)(7)
 323-325  I3    ---       Nobs   [1/9]?=-99 Total number of observations
                                   extracted (4)
 327-329  I3    ---       Nph    [1/9]?=-99 Number of observations merged to
                                   estimate photometry properties (4)
 331-336  F6.3  arcmin  b_theta  ? Smallest off-axis angle for merged
                                   observations (4)
 338-343  F6.3  arcmin    theta  ? Average off-axis angle {theta} for merged
                                   observations (4)
 345-350  F6.3  arcmin  B_theta  ? Largest off-axis angle for merged obs. (4)
 352-355  F4.2  ---       PSFf   [0/1]? Average PSF fraction (at 1.5 keV) for
                                   merged observations (4)
 357-360  F4.2  ---       aglow  [0/1]? Suspected afterglow fraction (4)(8)
 362-366  I5    ct        Oct-t  ?=-99 Extracted total (0.5-8keV) counts in
                                   merged apertures (4)
 368-375  F8.2  ct        Nct-t  [1/89438]? Net total (0.5-8keV) counts in
                                   merged apertures (4)
 377-384  F8.2  ct        Nct-s  ? Net soft (0.5-2 keV) counts in merged
                                   apertures (4)
 386-393  F8.2  ct        Nct-h  ? Net hard (2-8 keV) counts in merged
                                   apertures (4)
 395-402  F8.2  ct      b_Nct-t  ? 1{sigma} lower bound on Nct-t (4)(9)
 404-411  F8.2  ct      B_Nct-t  ? 1{sigma} upper bound on Nct-t (4)(9)
 413-420  F8.2  ct      b_Nct-s  ? 1{sigma} lower bound on Nct-s (4)(9)
 422-429  F8.2  ct      B_Nct-s  ? 1{sigma} upper bound on Nct-s (4)(9)
 431-438  F8.2  ct      b_Nct-h  ? 1{sigma} lower bound on Nct-h (4)(9)
 440-447  F8.2  ct      B_Nct-h  ? 1{sigma} upper bound on Nct-h (4)(9)
 449-453  F5.3  keV       E-t    ? Median 0.5-8keV energy, observed
                                    spectrum (4)(10)
 455-461  F7.3 [ph/cm2/s] XFlx-t ? Log of incident photon flux in total
                                    0.5-8 keV band (4)(11)
 463-469  F7.3 [ph/cm2/s] XFlx-s ? Log of incident photon flux in soft
                                   0.5-2 keV band (4)(11)
 471-477  F7.3 [ph/cm2/s] XFlx-h ? Log of incident photon flux in hard
                                   2-8 keV band (4)(11)
 479-490  E12.6 10-7W     LX-h   ? X-ray luminosity in erg/s, 2-8 keV (12)
 492-503  E12.6 10-7W     LXc-h  ? Absorption-corrected X-ray luminosity,
                                   in erg/s; 2-8 keV (12)
 505-516  E12.6 10-7W   e_LXc-h  ? LXhc 1{sigma} statistical uncertainty (12)
 518-529  E12.6 10-7W   s_LXc-h  ? LXhc 1{sigma} systematic uncertainty (12)
 531-542  E12.6 10-7W     LX-t   ? X-ray luminosity in erg/s, 0.5-8 keV (12)
 544-555  E12.6 10-7W     LXc-t  ? Absorption-corrected X-ray luminosity,
                                   in erg/s; 0.5-8 kev (12)
 557-568  E12.6 10-7W   e_LXc-t  ? LXtc 1{sigma} statistical uncertainty (12)
 570-581  E12.6 10-7W   s_LXc-t  ? LXtc 1{sigma} systematic uncertainty (12)
 583-587  F5.2  cm-2      logNH  ? Gas column density (12)
 589-592  F4.2  cm-2    e_logNH  ? logNH 1{sigma} statistical error (12)
 594-597  F4.2  cm-2    s_logNH  ? logNH 1{sigma} systematic uncertainty (12)
 599-602  F4.2  ---       pr.N   [0/1]? Counterpart probability, X-ray/NIR (G5)
 604-607  F4.2  ---       pr.M   [0/1]? counterpart probability, X-ray/MIR (G5)
 609-614  F6.3  mag       Jmag   [4.7/25.2]? J-band magnitude
 616-622  F7.3  mag     e_Jmag   [-25.1/3.3]? Jmag 1{sigma} uncertainty
 624-629  F6.3  mag       Hmag   [4.5/29.9]? H-band magnitude
 631-637  F7.3  mag     e_Hmag   [-22.2/6.6]? Hmag 1{sigma} uncertainty
 639-644  F6.3  mag       Kmag   [4.3/21.5]? K-band magnitude
 646-650  F5.3  mag     e_Kmag   ? Kmag 1-{sigma} uncertainty
 652-657  F6.3  mag       [3.6]  ? Spitzer/IRAC 3.6um band magnitude
 659-663  F5.3  mag     e_[3.6]  ? [3.6] 1-{sigma} uncertainty
 665-670  F6.3  mag       [4.5]  ? Spitzer/IRAC 4.5um band magnitude
 672-676  F5.3  mag     e_[4.5]  ? [4.5] 1-{sigma} uncertainty
 678-683  F6.3  mag       [5.8]  [2/17.5]? Spitzer/IRAC 5.8um band magnitude
 685-689  F5.3  mag     e_[5.8]  [0/10]? [5.8] 1-{sigma} uncertainty
 691-696  F6.3  mag       [8.0]  [1.5/17]? Spitzer/IRAC 8.0um band magnitude
 698-703  F6.3  mag     e_[8.0]  [0/15]? [8.0] 1-{sigma} uncertainty
 705-707  A3    ---     f_Jmag   UKIRT photometry flag on Jmag (G6)
 709-711  A3    ---     f_Hmag   UKIRT photometry flag on Hmag (G6)
 713-715  A3    ---     f_Kmag   UKIRT photometry flag on Kmag (G6)
 717-719  A3    ---       2M     2MASS photometry flag
 721-723  A3    ---     q_2M     2MASS quality photometry flag
 725-728  I4    ---     n_Jmag   GLIMPSE photometry flag on Jmag
 730-733  I4    ---     n_Hmag   GLIMPSE photometry flag on Hmag
 735-738  I4    ---     n_Kmag   GLIMPSE photometry flag on Kmag
 740-744  I5    ---     f_[3.6]  GLIMPSE photometry flag on [3.6]
 746-750  I5    ---     f_[4.5]  GLIMPSE photometry flag on [4.5]
 752-757  I6    ---     f_[5.8]  GLIMPSE photometry flag on [5.8]
 759-764  I6    ---     f_[8.0]  GLIMPSE photometry flag on [8.0]
 766-768  I3    ---       LS     [-2/4]?=-99 Local Spitzer photometry flag (G7)
 770-788  A19   ---     r_Jmag   Origin of Jmag photometry
 790-808  A19   ---     r_Hmag   Origin of Hmag photometry
 810-828  A19   ---     r_Kmag   Origin of Kmag photometry
 830-848  A19   ---     r_[3.6]  Origin of [3.6] photometry
 850-868  A19   ---     r_[4.5]  Origin of [4.5] photometry
 870-888  A19   ---     r_[5.8]  Origin of [5.8] photometry
 890-908  A19   ---     r_[8.0]  Origin of [8.0] photometry
 910-912  I3    ---       Cl     [-2/2]?=-99 Classification (G8)
 914-919  F6.3  mag       Av     [0/81]? Visual extinction A_V_
 921-923  I3    ---       St     [-1/2]?=-99 YSO stage (G9)
 925-928  F4.2  ---       H1pr   [0/1]? H1 class prior probability
                                   (position-dependent)
 930-933  F4.2  ---       H2pr   [0/1]? H2 class prior probability
                                   (position-dependent)
 935-938  F4.2  ---       H3pr   [0/1]? H3 class prior probability
                                   (position-dependent)
 940-943  F4.2  ---       H4pr   [0/1]? H4 class prior probability
                                    (position-dependent)
 945-948  F4.2  ---       H1ps   [0/1]? H1 class posterior probability
 950-953  F4.2  ---       H2ps   [0/1]? H2 class posterior probability
 955-958  F4.2  ---       H3ps   [0/1]? H3 class posterior probability
 960-963  F4.2  ---       H4ps   [0/1]? H4 class posterior probability
 965-967  I3    ---       H2f    [1/7]?=-99 H2 dominant classification
                                     term (G10)
 969-971  I3    ---       Xcl    [1/2]?=-99 X-ray classification (G11)
--------------------------------------------------------------------------------
Note (1): The MYStIX source name (MPCM) is the sexagesimal representation
     of the MYStIX source position. In rare cases two MPCM rows will share
     the same source position, because two X-ray sources have been assigned
     the same NIR counterpart by our counterpart identification algorithm.
     In such cases we append "a" or "b" to the source names to make them
     unique. See section 2.
Note (2): When a source has been associated with a known massive star
     (column "Olab") all XPHOT quantities (see Note (12)) are unreliable.
Note (3): References for SpT (number 0-10 are cited in Gagne et al., 2011,
     Cat. J/ApJS/194/5) - see refs.dat file.
Note (4): These X-ray column labels were previously published by Broos et
     al. (2011, Cat. J/ApJS/194/4; 2011, Cat. J/ApJS/194/2) and are
     produced by the ACIS Extract (AE) software package (Broos et al.
     2010ApJ...714.1582B, 2012ascl.soft03001B). The AE software and User's
     Guide are available at
     http://www.astro.psu.edu/xray/acis/acis_analysis.html
Note (5): In statistical hypothesis testing, the p-value is the probability
     of obtaining a test statistic at least as extreme as the one that was
     actually observed when the null hypothesis is true.
Note (6): Smallest p-value for the one-sample Kolmogorov-Smirnov statistic
     under the no-variability null hypothesis within a single-observation
     or over merged observations. See Broos et al. (2010ApJ...714.1582B,
     Section 7.6) for a description of the variability metrics and caveats
     regarding possible spurious indications of variability using the
     ProbKS_merge metric.
Note (7): Due to dithering over inactive portions of the focal plane, a
     Chandra source is often not observed during some fraction of the
     nominal exposure time (See http://cxc.harvard.edu/ciao/why/dither.html).
     The reported quantity is FRACEXPO produced by the CIAO tool mkarf.
Note (8): Some background events arising from an effect known as
     "afterglow" (http://cxc.harvard.edu/ciao/why/afterglow.html) may
     contaminate source extractions, despite careful procedures to identify
     and remove them during data preparation (Broos et al.
     2010ApJ...714.1582B, Section 3). After extraction, we attempt to
     identify afterglow events using the tool ae_afterglow_report, and
     report the fraction of extracted events attributed to afterglow; see
     the ACIS Extract manual
     (http://www.astro.psu.edu/xray/acis/acis_analysis.html).
Note (9): Confidence intervals (68%) for NetCounts quantities are estimated
     by the CIAO tool aprates:
     http://asc.harvard.edu/ciao/ahelp/aprates.html
Note (10): MedianEnergy ("MedEt") is the ACIS Extract quantity
     "ENERG_PCT50_OBSERVED", the median energy of extracted events,
     corrected for background (Broos et al. 2010ApJ...714.1582B, #7.3).
Note (11): PhotonFlux
     ("PFlx")=(NetCounts/MeanEffectiveArea/ExposureTimeNominal) (Broos et
     al. 2010ApJ...714.1582B, Section 7.4).
Note (12): X-ray Spectral Model (XPHOT) from Getman et al. 2010, Cat.
     J/ApJ/708/1760.
--------------------------------------------------------------------------------

Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
   Bytes Format Units    Label   Explanations
--------------------------------------------------------------------------------
   1- 16  A16   ---      Reg     MYStIX Galactic massive star-forming region
                                  (MSFR) name
  18- 35  A18   ---      MPCM    IAU source name (HHMMSS.ss+DDMMSS.s; J2000)
  37- 46  F10.6 deg      RAdeg   Right ascension (J2000)
  48- 57  F10.6 deg      DEdeg   Declination (J2000)
  59- 63  F5.3  arcsec   ePos    [0/2.5] 1{sigma} error around (RAdeg,DEdeg)
  65- 71  A7    ---      rPos    Origin of position (G1)
  73- 90  A18   ---      CXO     X-ray source name in IAU format
                                      (HHMMSS.ss+DDMMSS.s; J2000)
  92-102  A11   ---      Xlab    X-ray source name used within the MYStIX
                                      project (G2)
 104-121  A18   ---      NName   Name in NIR catalog (G3)
                                     (HHMMSS.ss+DDMMSS.s; J2000)
 123-138  A16   ---      Nlab    Label in NIR catalog
 140-157  A18   ---      MName   Name in MIR catalog
                                     (HHMMSS.ss+DDMMSS.s; J2000) (G4)
 159-187  A29   ---      Mlab    Label in MIR catalog
 189-192  F4.2  ---      pr.N    [0/1]? Counterpart probability, X-ray/NIR (G5)
 194-197  F4.2  ---      pr.M    [0/1]? Counterpart probability, X-ray/MIR (G5)
 199-204  F6.3  mag      Jmag    [4.7/25.7]? J-band magnitude
 206-212  F7.3  mag    e_Jmag    [-25.1/3.6]? Jmag 1{sigma} uncertainty
 214-219  F6.3  mag      Hmag    [4.7/23.9]? H-band magnitude
 221-227  F7.3  mag    e_Hmag    [-22.2/2.9]? Hmag 1{sigma} uncertainty
 229-234  F6.3  mag      Kmag    [4.4/19.5]? K-band magnitude
 236-240  F5.3  mag    e_Kmag    ? Kmag 1{sigma} uncertainty
 242-247  F6.3  mag      [3.6]   ? Spitzer/IRAC 3.6um band magnitude
 249-253  F5.3  mag    e_[3.6]   ? [3.6] 1-{sigma} uncertainty
 255-260  F6.3  mag      [4.5]   ? Spitzer/IRAC 4.5um band magnitude
 262-266  F5.3  mag    e_[4.5]   ? [4.5] 1-{sigma} uncertainty
 268-273  F6.3  mag      [5.8]   [2.3/17.7]? Spitzer/IRAC 5.8um band magnitude
 275-279  F5.3  mag    e_[5.8]   [0/9.8]? [5.8] 1-{sigma} uncertainty
 281-286  F6.3  mag      [8.0]   [1.5/17]? Spitzer/IRAC 8.0um band magnitude
 288-295  F8.3  mag    e_[8.0]   [0/15.1]? [8.0] 1-{sigma} uncertainty
 297-299  A3    ---    f_Jmag    UKIRT photometry flag on Jmag (G6)
 301-303  A3    ---    f_Hmag    UKIRT photometry flag on Hmag (G6)
 305-307  A3    ---    f_Kmag    UKIRT photometry flag on Kmag (G6)
 309-311  A3    ---      2M      2MASS photometry flag
 313-315  A3    ---    q_2M      2MASS photometry quality flag
     317  I1    ---    n_Jmag    [0] GLIMPSE photometry flag on Jmag
     319  I1    ---    n_Hmag    [0] GLIMPSE photometry flag on Hmag
     321  I1    ---    n_Kmag    [0] GLIMPSE photometry flag on Kmag
 323-327  I5    ---    f_[3.6]   GLIMPSE photometry flag on [3.6]
 329-334  I6    ---    f_[4.5]   GLIMPSE photometry flag on [4.5]
 336-341  I6    ---    f_[5.8]   GLIMPSE photometry flag on [5.8]
 343-348  I6    ---    f_[8.0]   GLIMPSE photometry flag on [8.0]
 350-352  I3    ---      LS      [-2/4]?=-99 Local Spitzer photometry flag (G7)
 354-360  A7    ---    r_Jmag    Origin of Jmag photometry
 362-368  A7    ---    r_Hmag    Origin of Hmag photometry
 370-376  A7    ---    r_Kmag    Origin of Kmag photometry
 378-390  A13   ---    r_[3.6]   Origin of [3.6] photometry
 392-404  A13   ---    r_[4.5]   Origin of [4.5] photometry
 406-418  A13   ---    r_[5.8]   Origin of [5.8] photometry
 420-432  A13   ---    r_[8.0]   Origin of [8.0] photometry
 434-436  I3    ---      Cl      [-2/2]?=-99 Classification (G8)
 438-443  F6.3  mag      Av      [0/61]? Visual extinction A_V_
 445-447  I3    ---      St      [-1/2]?=-99 YSO stage (G9)
 449-452  F4.2  ---      H1pr    [0/1] H1 class prior probability
                                     (position-dependent)
 454-457  F4.2  ---      H2pr    [0/1] H2 class prior probability
                                     (position-dependent)
 459-462  F4.2  ---      H3pr    [0/1] H3 class prior probability
                                     (position-dependent)
 464-467  F4.2  ---      H4pr    [0/1] H4 class prior probability
                                     (position-dependent)
 469-472  F4.2  ---      H1ps    [0/1]? H1 class posterior probability
 474-477  F4.2  ---      H2ps    [0/1]? H2 class posterior probability
 479-482  F4.2  ---      H3ps    [0/1]? H3 class posterior probability
 484-487  F4.2  ---      H4ps    [0/1]? H4 class posterior probability
     489  I1    ---      H2f     [1/7] H2 dominant classification term (G10)
     491  I1    ---      Xcl     [0/4]? X-ray classification (G11)
--------------------------------------------------------------------------------

Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
   Bytes Format Units   Label     Explanations
--------------------------------------------------------------------------------
   1- 19  A19   ---     Ref       Reference code
  21- 39  A19   ---     BibCode   Bibcode
  41- 62  A22   ---     Aut       Author's name(s)
  64- 97  A34   ---     Comm      Comment
--------------------------------------------------------------------------------

Global notes:
Note (G1): The MYStIX source position is the most accurate position among
     the multiwavelength detections that we judged to be the same object:
     a Chandra X-ray position, UKIRT or 2MASS NIR position, or a Spitzer
     MIR position:
  Megeath2012 = Megeath et al., 2012AJ....144..192M (Spitzer survey of
           Orion A and B molecular clouds).
  OBcat = Massive stars (B3 or earlier) were drawn from the literature
          collections of Skiff (2009, Cat. B/mk) and SIMBAD, and from a list
          given in section 2. Note that these spectroscopically identified OB
          stars typically do not have IR excesses and some, but not all, have
          X-ray detections.
 Chandra = X-ray position
 Spitzer = Mid-IR position from Spitzer
 UKIDSS  = near-IR position from UKIDSS survey (see II/316, II/319)
 TWOMASS = near-IR position from 2MASS (Cat. II/246)
Note (G2): X-ray source labels identify a Chandra pointing; they do not
     convey membership in astrophysical clusters. L.K. Townsley & P.S.
     Broos (2013, in preparation) and Kuhn et al. (2013, J/ApJS/209/27)
     identify a few very bright X-ray sources in each region that suffer
     from a type of instrumental non-linearity known as photon pile-up
     (http://cxc.harvard.edu/ciao/why/pileup_intro.html); X-ray properties
     reported for those sources are biased and should be used with caution.
Note (G3): NIR catalogs were constructed by combining deep UKIRT catalogs
     (King et al. 2013ApJS..209...28K) where available, with bright stars
     from the 2MASS catalog (Skrutskie et al. 2006, Cat. VII/233).
Note (G4): MIR catalogs were obtained from local reductions of Spitzer
     observations (Kuhn et al. 2013, J/ApJS/209/29), from the Spitzer
     Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE;
     Benjamin et al. 2003PASP..115..953B, see Cat. II/293), and from the
     Vela-Carina Survey (Spitzer Proposal ID 40791, PI S. Majewski).
     Feigelson et al. (2013ApJS..209...26F, Table 2) report which IR
     catalogs were available for each MYStIX MSFR.
Note (G5): Counterpart probability from Naylor et al. 2013, Cat. J/ApJS/209/30.
Note (G6): UKIRT photometry flag (King et al. 2013, Cat. J/ApJS/209/28)
Note (G7): "Local Spitzer" photometry flag (Kuhn et al. 2013,
     Cat. J/ApJS/209/29) as follows:
    4 = 4-pixel aperture used;
    3 = 3-pixel aperture used;
    2 = 2-pixel aperture used and contaminating flux is <10% of source flux;
   -1 = 2-pixel aperture used and contaminating flux is >10% of source flux.
Note (G8): SED Properties (Povich et al. 2013, Cat. J/ApJS/209/31) with SED
           classification as follows:
    0 = likely YSO,
    1 = starburst galaxy,
    2 = AGN,
    3 = PAH knot
Note (G9): Evolutionary Stage classification as follows:
    1 = stage 0/1,
    2 = Stage II/III
   -1 = ambiguous.
Note (G10): H2_dominant_factor ("H2f") reports the classifier term that exerts
            the most influence on the H2 posterior probability as follows:
    1 = prior,
    2 = MedianEnergy,
    3 = J magnitude,
    4 = X-ray variability,
    5 = spectral type,
    6 = 4.5um magnitude,
    7 = infrared SED model.
Note (G11): Classification in X-ray as follows:
    0 = unclassified
    1 = H1: source is a foreground Galactic field star
    2 = H2: source is a young star in the MSFR (Galactic massive star-forming
         region)
    3 = H3: source is a background Galactic field star
    4 = H4: source is an extragalactic object
--------------------------------------------------------------------------------

History:
    From electronic version of the journal

References:
 Feigelson et al.  Overview.           2013ApJS..209...26F
 Kuhn et al.       X-ray sources.      2013ApJS..209...27K  Cat. J/ApJS/209/27
 King et al.       Crowded fields.     2013ApJS..209...28K  Cat. J/ApJS/209/28
 Kuhn et al.       MIR.                2013ApJS..209...29K  Cat. J/ApJS/209/29
 Naylor et al.     Bayesian matching.  2013ApJS..209...30N  Cat. J/ApJS/209/30
 Povich et al.     IR excess cat.      2013ApJS..209...31P  Cat. J/ApJS/209/31
 Broos et al.      Young stars.        2013ApJS..209...32B  (this paper)

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(End)                 Greg Schwarz [AAS], Emmanuelle Perret [CDS]    09-Jan-2014