Hostname: page-component-7479d7b7d-767nl Total loading time: 0 Render date: 2024-07-12T14:31:22.881Z Has data issue: false hasContentIssue false
  • English
  • Français

A Thermal Pressure Inside the Local Bubble, as Revealed by CI Fine-Structure Excitation

Published online by Cambridge University Press:  12 April 2016

Edward B. Jenkins
Edward B. Jenkins*
Affiliation:
Princeton University Observatory, Princeton, NJ 08544USA

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Ultraviolet absorption lines from carbon atoms within a neutral cloud inside or near the edge of the Local Bubble can reveal the thermal pressure of the gas, since the relative populations of the fine-structure levels are determined by a balance between collisional excitation and radiative decay. Features from a C I multiplet appearing in the uv spectrum of the star δ Cyg (l = 79°, b = +10°, d = 52 pc) were observed with the echelle spectrograph of the Goddard High Resolution Spectrograph on HST. An interpretation of absorptions detected from the two lowest levels gives a thermal pressure range 102.7 < p/k < 103.7 cm−3K.

Type
Part II UV and Soft X-ray Observations of the LISM
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 33 - 36
Copyright
Copyright © Springer-Verlag 1998

References

Blades, J.C., Wynne-Jones, I., & Wayte, R.C. 1980: MNRAS, 193, 849 Google Scholar
Bowyer, S., Lieu, R., Sidher, S.D., Lampton, M., & Knude, J. 1995: Nature, 375, 212 Google Scholar
Cox, D.P., & Reynolds, R.J. 1987: Ann. Rev. A&A, 25, 303 CrossRefGoogle Scholar
Hoffleit, D., & Jaschek, C. 1982: The Bright Star Catalogue, (New Haven: Yale U. Obs.)Google Scholar
Jenkins, E.B., Jura, M., & Loewenstein, M. 1983: ApJ, 270, 88 Google Scholar
Jenkins, E.B., & Shaya, E.J. 1979: ApJ, 231, 55 Google Scholar
Keenan, F.P. 1989: ApJ, 339, 591 Google Scholar
Kulkarni, S.R., & Heiles, C. 1988: in Galactic and Extragalactic Radio Astronomy, ed. Verschuur, G.L. & Kellermann, K.I. (Berlin: Springer), p. 95 Google Scholar
Lallement, R. 1997: these proceedingsGoogle Scholar
Paresce, F. 1984: Astron. J., 89, 1022 Google Scholar
Robinson, R.D. 1995: in Calibrating Hubble Space Telescope: Post Servicing Mission, ed. Koratkar, A. & Leitherer, C. (Baltimore: Space Telescope Science Inst.), p. 193 Google Scholar
Vallerga, J.V., Vedder, P.W., Craig, N., and Welsh, B.Y. 1993: ApJ, 411, 729 CrossRefGoogle Scholar
Welty, D.E., Hobbs, L.M., & Kulkarni, V.P. 1994: ApJ, 436, 152 Google Scholar
Welty, D.E., Morton, D.C., & Hobbs, L.M. 1996: ApJS, 106, 533 CrossRefGoogle Scholar
Wood, B.E. & Linsky, J.L. 1997: ApJL, 474, L39 Google Scholar