J/ApJ/491/L31 TMGS star positions (Garzon+ 1997)
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 1997ApJ...491L..31G (SIMBAD/NED BibCode)
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
References:
Garzon et al., First results of the TMGS 1993MNRAS.264..773G 1993MNRAS.264..773G
(End) Patricia Bauer [CDS] 30-Jan-1998