ACDS V10.0 - Detailed Description of J/MNRAS/384/1277

ACDS V10.0 - Sun Jan 19 22:56:06 CET 2025

| # Detailed Description of J/MNRAS/384/1277 : H{alpha} emission line sources from IPHAS (Witham+, 2008) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    J/MNRAS/384/1277    H{alpha} emission line sources from IPHAS    (Witham+, 2008)
    ================================================================================
    The IPHAS catalogue of H{alpha} emission-line sources in the northern
    Galactic plane.
        Witham A.R., Knigge C., Drew J.E., Greimel R., Steeghs D., Gansicke B.T.,
        Groot P.J., Mampaso A.
       <Mon. Not. R. Astron. Soc. 384, 1277 (2008)>
       =2008MNRAS.384.1277W
    ================================================================================
    ADC_Keywords: Stars, emission ; Galactic plane ; Photometry, CCD ;
                  Photometry, H-alpha
    Keywords: surveys - catalogues - stars: emission-line, Be -
              Galaxy: stellar content

    Abstract:
        We present the first catalogue of point-source H{alpha} emission line
        objects selected from the INT/WFC Photometric H{alpha} Survey of the
        Northern Galactic Plane (IPHAS). In total, our catalogue contains 4853
        point sources that exhibit strong photometric evidence for H{alpha}
        emission. The catalogue is a conservative subset of the emitters
        present in IPHAS and it is likely that there are many more H{alpha}
        emitters present in the area of the Galactic Plane that IPHAS
        observes. Our selection criteria are designed to be conservative
        (rather than complete) in order to avoid a significant number of false
        positives in the catalogue. In line with this, we find that of the
        ~300 catalogue sources for which we have preliminary spectroscopic
        follow-up observations, more than 95% are confirmed as genuine
        emission-line sources.

    Description:
        We present IPHAS positions and photometry for 4853 sources selected as
        having a H{alpha} excess from the photometry. The catalogue covers the
        magnitude range 13<=r'<=19.5mag, and includes sources in the northern
        hemisphere in the galactic latitude range -5<b<5°. The data from
        which the catalogue is derived come from IPHAS observations obtained
        from September 2003 to January 2007 and represents ~1500deg2 (80%)
        of the ultimate survey area.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × emitters.dat      87     4853   Positions and photometry for 4853 sources
                                  (table2 of the paper)

    See also:
        III/205 : H-alpha Stars in Northern Milky Way (Kohoutek+ 1997)

    Byte-by-byte Description of file:  emitters.dat

       Bytes Format Units   Label     Explanations

       1-  2  I2    h       RAh       Right ascension (J2000.0)
       4-  5  I2    min     RAm       Right ascension (J2000.0)
       7- 11  F5.2  s       RAs       Right ascension (J2000.0)
          13  A1    ---     DE-       Declination sign (J2000.0)
      14- 15  I2    deg     DEd       Declination (J2000.0)
      17- 18  I2    arcmin  DEm       Declination (J2000.0)
      20- 23  F4.1  arcsec  DEs       Declination (J2000.0)
      25- 43  A19   ---     IPHAS     IPHAS source designation, JHHMMSS.ss+DDMMSS.s (1)
      45- 50  F6.3  mag     r'mag     Sloan r' band magnitude
      52- 56  F5.3  mag     e_r'mag   Sloan r' band magnitude error
      58- 63  F6.3  mag     r'-i'     Sloan r'-i' colour index
      65- 69  F5.3  mag     e_r'-i'   Sloan r'-i' colour index error
      71- 76  F6.3  mag     r'-Ha     Sloan r'-H{alpha} colour index
      78- 82  F5.3  mag     e_r'-Ha   Sloan r'-H{alpha} colour index error
      84- 87  A4    ---     Flag      [cksmo ] Photometry/Cross-match flag (2)

    Note (1): Sexagesimal, equatorial position-based source name in the form:
         JHHMMSS.ss+DDMMSS.s. The full naming convention for IPHAS sources has
         the form "IPHAS JHHMMSS.ss+DDMMSS.s", where "J" indicates the position
         is J2000. The "IPHAS" prefix is not listed explicitly in the
         designation column.
    Note (2): This column is used to flag any special circumstances related
         to the photometry or if the object is in the vicinity of a Kohoutek
         & Wehmeyer (1999, Cat. III/205) object.
         Possible entries in this column are as follows:
         c = the object does not have consistent magnitudes in any of the
             IPHAS fields it has been observed in.  This can be as a result
             of source variability or poor photometric calibration due to
             observations in less than ideal conditions.
         m = the object is located in a IPHAS field where manual selection of
             emitters took place.
         o = the object is located in a IPHAS field where manual selection of
             emitters took place and additionally the distribution of sources
             in the r'-i' vs r'-H{alpha} colour-colour plots in this field
             looked unusual.
         k = the object has been matched with a previously known H{alpha}
             emitter in the (Kohoutek & Wehmeyer, 1999, Cat. III/205)
             catalogue using a matching radius of up to 30arcsec.
         s = the object has been matched with a SIMBAD source.

    Acknowledgements:
        Andrew Witham, arw_sent(at)yahoo.co.uk
    ================================================================================
    (End)      Andrew Witham [Southampton, UK], Patricia Vannier [CDS]   21-Dec-2007