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2 Gnaciński P.

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Interstellar Medium in the M43 Nebula

Gnaciński P.

Acta Astronomica

2009

Vol. 59, No. 3

325--334

We present a list of interstellar absorption lines in the direction of HD 37061 in the M43 nebula. Some of the absorption lines arise from atomic excited levels that are uncommon in interstellar clouds. The excited levels of FeII are populated by fluorescence. We found a large number of H2 molecular absorption lines arising from vibrationally excited levels. The ortho/para H2 ratio is equal to 2.7. The H2 rotational temperature of vibrational levels 1-5 exceeds 2000 K.

Deuterium Depletion and Magnesium Enhancement in the Local Disk

Gnaciński P.

Acta Astronomica

2005

Vol. 55, No. 4

407--413

The local disk deuterium is known to be depleted in comparison to the local bubble. We used Hubble Space Telescope (HST) spectra to obtain column densities of Si, Mg and Fe. We compared normalized column densities of these elements in the directions with high and low deuterium abundances. We show, that the lines of sight that are depleted in deuterium, are enhanced in magnesium. This observation implicates that astration is responsible for both deuterium depletion and magnesium enhancement.