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Interstellar D/H on the Sightline of Sirius

  • G. Hébrard (a1), A. Vidal-Madjar (a1), R. Ferlet (a1), C. Mallouris (a2), D. York (a2) and M. Lemoine (a3)...

Abstract

We present observations of the binary Sirius A / Sirius B performed with HST-GHRS. Two interstellar clouds are detected on this sightline, one of them being identified as the Local Interstellar Cloud (LIC). Lyman α interstellar lines are also observed, but whereas the deuterium Lyman α line is well detected in the LIC with an abundance in agreement with that obtained by Linsky et al. (1995), no significant D i line is detected in the second cloud. The deuterium abundance which we measured in this cloud is 0 < (D/H)ism < 1-6 × 10−5. Despite the large error bar, this sightline appears consequently as a good candidate for a low (D/H)ism.

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References

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Ferlet, R. 1999, A&AR 9, 153
Hébrard, G., Mallouris, C., Ferlet, R., Koester, D., Lemoine, M., Vidal-Madjar, A., & York, D. 1999, A&A 350, 643
Lallement, R., Bertin, P., Ferlet, R., Vidal-Madjar, A., & Bertaux, J.L. 1994, A&A 286, 898
Lemoine, M., Vidal-Madjar, A., Bertin, P., et al. 1996, A&A 308, 601
Linsky, J., Diplas, A., Wood, B.E., Brown, A., Ayres, T.R., & Savage, B.D. 1995, ApJ 451, 335
Vidal-Madjar, A., Lemoine, M., Ferlet, R., Hébrard, G., Koester, D., Audouze, J., Cassé, M., Vangioni-Flam, E., & Webb, J. 1998, A&A 338, 694

Interstellar D/H on the Sightline of Sirius

  • G. Hébrard (a1), A. Vidal-Madjar (a1), R. Ferlet (a1), C. Mallouris (a2), D. York (a2) and M. Lemoine (a3)...

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