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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 08544 USA

Abstract

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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

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