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On the spatial distribution of the galactic Wolf-Rayet stars

Published online by Cambridge University Press:  25 May 2016


Emilio J. Alfaro
Affiliation:
IAA (CSIC), P.O. Box 3004, E-18008 Granada, Spain
Miguel Cerviño
Affiliation:
LAEFF (INTA), P.O. Box 50727, E-28080 Madrid, Spain
J.A. Rubiño
Affiliation:
IAA (CSIC), P.O. Box 3004, E-18008 Granada, Spain IAC, c/ Vía Láctea s/n, E-38200 La Laguna, Tenerife, Spain
Jesus Cabrera-Caño
Affiliation:
IAA (CSIC), P.O. Box 3004, E-18008 Granada, Spain Universidad de Sevilla, P.O. Box 1045, E-18080 Sevilla, Spain
José M. Vílchez
Affiliation:
IAA (CSIC), P.O. Box 3004, E-18008 Granada, Spain IAC, c/ Vía Láctea s/n, E-38200 La Laguna, Tenerife, Spain


Abstract

From a new compilation of spectral types and photometry (version April '98 on the Web) performed by van der Hucht for the Galactic WR stars, we have estimated the distance using two different luminosity-spectral type calibrations. Both determinations lead to similar results. On the basis of newly determined distances we have performed a quantitative analysis of the spatial density distribution for the WN and WC spectral types as well as for the whole WR sample and compared them to the one depicted by the large star-forming regions delineated by the population of young open clusters (YOCs). WR stars show a clumpy distribution similar to the one shown by the YOCs and the WN and WC spectral classes present different galactic distributions as well. Otherwise, variations of the WC/WN quotient do not show a clear correlation with the galactic metallicity gradient, on the contrary this ratio seems to be constant on regions of about 1 kpc in size and shows significant variations (even by a factor of 8) between the closest star-forming complexes.


Type
Part 1. Basic observational properties of Wolf-Rayet stars and other hot massive stars
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Alfaro, E.J., Delgado, A., Cabrera-Caño, J. 1992, ApJ 386, L47 CrossRefGoogle Scholar
Silverman, B.W. 1986, Density Estimation for Statistic and Data Analysis (London: Chapma and Hall)CrossRefGoogle Scholar
Smith, L.F., Shara, M.M., Moffat, A.F.J. 1996, MNRAS 281, 163 CrossRefGoogle Scholar
van der Hucht, K.A. 1995, in: van der Hucht, K.A. & Williams, P.M. (eds.), Wolf-Rayet Stars, Binaries, Colliding Winds, Evolution, Proc. IAU Symp. No. 163 (Dordrecht: Kluwer), p. 7 CrossRefGoogle Scholar

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On the spatial distribution of the galactic Wolf-Rayet stars
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