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J/A+A/485/41  VLT spectroscopy of blue massive stars in NGC55    (Castro+, 2008)
The Araucaria Project: VLT-spectroscopy of blue massive stars in NGC55.
    Castro N., Herrero A., Garcia M., Trundle C., Bresolin F., Gieren W.,
    Pietrzynski G., Kudritzki R.-P., Demarco R.
   <Astron. Astrophys., 485, 41-50 (2008)>
   =2008A&A...485...41C
ADC_Keywords: Galaxies, nearby ; Stars, blue ; Spectral types ; Photometry ;
              Radial velocities
Keywords: galaxies: individual: NGC 55 - galaxies: stellar content -
          stars: early-type - stars: fundamental parameters - catalogs

Abstract:
    This is the first paper of a series devoted to studying the population
    of blue massive stars in NGC 55, a galaxy of the Sculptor group at a
    distance of about 2Mpc.

    We have obtained optical (3300-6210Å), low-resolution spectra of
    approximately 200 blue massive stars with VLT-FORS2, which we have
    classified with the aid of Milky Way and Magellanic Cloud standard
    stars.

Description:
    Targets were selected from existing V- and I-band photometry obtained
    as part of the ongoing ARAUCARIA Cepheid search project whose
    results have been reported in Pietrzynski et al. (2006, Cat.
    J/AJ/132/2556). These data were taken with the Warsaw 1.3m
    telescope at Las Campanas Observatory.

    We obtained spectra for ∼200 objects with FORS2 (FOcal Reducer and low
    dispersion Spectrograph) at the Very Large Telescope (VLT-UT2), in the
    Mask eXchange Unit (MXU) mode. The observations, performed in November
    2004.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tablea1.dat       94      168   Blue massive stars observed in NGC 55. We have also
                             included spectra displaying only HII emissions
tablea2.dat       94       23   F- and G-type stars observed in NGC 55
tablea3.dat       94       13   Low luminosity class stars, likely members of the
                             Milky Way halo


See also:
   J/MNRAS/370/25 : XMM observations of NGC 55 (Stobbart+, 2006)
   J/AJ/132/2556  : ARAUCARIA project: Cepheids in NGC 55 (Pietrzynski+, 2006)
   J/ApJ/672/266  : ARAUCARIA project: NGC 55 Cepheids JK mag (Gieren+, 2008)


Byte-by-byte Description of file: tablea[123].dat

   Bytes Format Units   Label     Explanations

   1-  5  A5    ---    [CHG2008]  Star identification, AA-NN (1)
       7  I1    h       RAh       Right ascension (J2000)
   9- 10  I2    min     RAm       Right ascension (J2000)
  12- 16  F5.2  s       RAs       Right ascension (J2000)
      18  A1    ---     DE-       Declination sign (J2000)
  19- 20  I2    deg     DEd       Declination (J2000)
  22- 23  I2    arcmin  DEm       Declination (J2000)
  25- 29  F5.2  arcsec  DEs       Declination (J2000)
  31- 36  F6.3  mag     Vmag      V magnitude
  38- 43  F6.3  mag     V-I       V-I colour index
  45- 52  A8    ---     SpType    MK Spectral type
  55- 61  F7.2  arcsec  Rg        Projected galactocentric distance
  63- 65  I3    km/s    RV        Radial velocity
  67- 69  I3    ---     S/N       Signal-to-noise ratio of the spectrum
  71- 77  A7    ---     Met       ?=- Metallicity estimate (Milky Way- or
                                      Magellanic Cloud-similarity)
  79- 94  A16   ---     Com       Comments

Note (1): Star identification, consisting on field number (A, B, C1, C2, D)
           followed by slit number.


History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    23-Jun-2008