Astrophysics and Space Science

, Volume 216, Issue 1–2, pp 45–54 | Cite as

Spectroscopic constraints on outflows from BN-type objects

  • Janet E. Drew


New high-quality high spectral resolution observations of the HI line emission from massive young stellar objects are described and discussed. It is proposed that two distinct physical components contribute to the observed emission. One of these is an optically-thick high-velocity stellar wind, the other a more slowly moving optically-thin volume of gas that may, in the case of S106IR at least, be caused by mass loading of the stellar wind. This decomposition is shown to resolve a long-standing problem regarding the relative widths of high and low opacity lines.

Key words

Infrared: stars stars: early-type, formation ISM: jets and outflows 


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  1. Bally, J., Snell. R.L., Predmore, R., 1983,Ap. J.,272, 154Google Scholar
  2. Bunn, J.C., D.Phil.Thesis, Oxford UniversityGoogle Scholar
  3. Bunn, J.C., Drew, J.E.,Mon. Not. R. astr. Soc.,255, 449Google Scholar
  4. Drew, J.E., Bunn, J.C., Hoare, M.G., 1993,Mon. Not. R. astr. Soc., in pressGoogle Scholar
  5. Eiroa, C., Elsasser, H., Lahulla, J.F., 1979,Astr. Ap.,74, 89Google Scholar
  6. Felli, M., Staude, H.J., Reddmann, T., Massi, M., Eiroa, C., Hefele, H., Neckel, T., Panagia, N. 1984,Astr. Ap.,135, 261Google Scholar
  7. Garden, R.P., Geballe, T.R.,Mon. Not. R. astr. Soc.,220, 611Google Scholar
  8. Hartquist, T.W., Dyson, J.E., Pettini, M., Smith, L.J., 1986,Mon. Not. R. astr. Soc.,221, 715Google Scholar
  9. Persson, S.E., Geballe, T.R., McGregor, P.J., Edwards, S., Lonsdale, C.J., 1984,Ap. J.,286, 289Google Scholar
  10. Persson, S.E., McGregor, P.J., Campbell, B., 1988,Ap. J.,326, 339Google Scholar
  11. Scoville, N., Kleinmann, S.G., Hall, D., Ridgway, S.T., 1983,Ap. J.,275, 201Google Scholar
  12. Simon, M., Cassar, L., 1984,Ap. J.,283, 179Google Scholar
  13. Simon, M., Felli, M., Cassar, L., Fischer, J., Massi, M., 1983,Ap. J.,266, 623Google Scholar
  14. Simon, M., Righini-Cohen, G., Fischer, J., Cassar, L., 1981,Ap. J.,251, 552Google Scholar
  15. Solf, J., Carsenty, U., 1982,Astr. Ap.,113, 142Google Scholar
  16. Staude, H.J., Lenzen, R., Dyck, H.M., Schmidt, G.D., 1982,Ap. J.,255, 95Google Scholar
  17. Wynn-Williams, C., 1982,Ann. Rev. Astr. Astrophys.,20, 587Google Scholar

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Janet E. Drew
    • 1
  1. 1.Department of PhysicsNuclear Physics LaboratoryOxfordUK

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