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J/ApJ/491/L31       TMGS star positions (Garzon+ 1997)
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A major star formation region in the receding tip of the stellar Galactic bar
       Garzon F., Lopez-Corredoira M., Hammersley P., Mahoney T.J., Calbet X.,
       Beckman J.E.
      <Astrophys. J. 491, L31 (1997)>
      =1997ApJ...491L..31G      (SIMBAD/NED BibCode)
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ADC_Keywords: Galactic plane ; Positional data
Keywords: Galaxy: stellar content - Galaxy: structure - stars: formation

Abstract:
    We present an analysis of the optical spectroscopy of 58 stars in the
    Galactic plane at l=27deg, where a prominent excess in the flux
    distribution and star counts have been observed in several spectral
    regions, in particular in the Two-Micron Galactic Survey (TMGS)
    catalog. The sources were selected from the TMGS to have a K magnitude
    brighter than +5mag and to be within 2deg of the Galactic plane. More
    than 60% of the spectra correspond to stars of luminosity class I, and
    a significant proportion of the remainder are very late and
    fast-evolving giants. This very high concentration of young sources
    points to the existence of a major star formation region in the
    Galactic plane, located just inside the assumed origin of the Scutum
    spiral arm. Such regions can form because of the concentrations of
    shocked gas where a galactic bar meets a spiral arm, as is observed at
    the ends of the bars of face-on external galaxies. Thus, the presence
    of a massive star formation region is very strong supporting evidence
    for the presence of a bar in our Galaxy.

File Summary:
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  FileName        Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1.dat         23       58   Coordinates of the TMGS sample
table1.tex         75       63   LaTeX version of table1
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    h       RAh       Right ascension (J2000.0)
   4-  5  I2    min     RAm       Right ascension (J2000.0)
   7- 10  F4.1  s       RAs       Right ascension (J2000.0)
      12  A1    ---     DE-       Declination sign
      13  I1    deg     DEd       Declination (J2000.0)
  15- 16  I2    arcmin  DEm       Declination (J2000.0)
  18- 19  I2    arcsec  DEs       Declination (J2000.0)
      21  A1    ---     Class     [S] S: supergiant; blank: giant
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Acknowledgements: Martin Lopez-Corredoira <martinlc@ll.iac.es>

References:
    Garzon et al., First results of the TMGS   1993MNRAS.264..773G
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(End)                                          Patricia Bauer [CDS]  30-Jan-1998