Lyman-Alpha Absorption and the D/H Ratio in the Local Interstellar Medium

Details Lyman-Alpha Absorption and the D/H Ratio in the Local Interstellar Medium Lyman-Alpha Absorption and the D/H Ratio in the Local Interstellar Medium

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488..760d&link_type=abstract

Astrophysical Journal v.488, p.760

Astronomy and Astrophysics

Astronomy

60

Ism: Abundances, Ism: Clouds, Ism: Bubbles, Ism: Kinematics And Dynamics, Ultraviolet: Ism

Scientific paper

Using the Goddard High Resolution Spectrograph onboard the Hubble Space Telescope, we have observed Ly alpha absorption against stellar chromospheres along six lines of sight, with additional observations of the Mg II H and K lines along five of the lines of sight and Fe II absorption along four of the lines of sight. We found absorption near the projected velocity of the local interstellar cloud (LIC) along three lines of sight. The velocity toward the stars beta Gem and sigma Gem was only marginally consistent with the LIC. The single interstellar component toward 31 Com had a velocity that was inconsistent with the projected LIC velocity. Three of the lines of sight showed a multicomponent velocity structure. For the star epsilon Eri we required an additional hot, low-density component which we have interpreted as a stellar hydrogen wall. The LIC temperatures derived from our data range from 7800 to 9700 K with values of the microturbulence parameter less than 2.0 km s-1. The measured D/H ratio for the LIC along every sight line is consistent with a value of 1.6 x 10-5, the best determined value being the beta Cas line of sight with D/H = 1.7 +/- 0.3 x 10-5.

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