H_2O Ice in the Envelopes of OH/IR Stars

Details H_2O Ice in the Envelopes of OH/IR Stars H_2O Ice in the Envelopes of OH/IR Stars

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.2509m&link_type=abstract

The Astronomical Journal, Volume 115, Issue 6, pp. 2509-2514.

Astronomy and Astrophysics

Astronomy

9

Ism: Dust, Extinction, Infrared Radiation, Ism: Clouds, Stars: Late-Type

Scientific paper

In an attempt to better understand the conditions under which molecules condense onto grains in the envelopes of evolved stars, we have searched for the presence of H_2O ice in the circumstellar envelopes of several evolved (OH/IR) stars. The sample of stars observed was selected on the basis of mass-loss rates, luminosities, and outflow velocities in order to cover a range of physical conditions that might affect the amount of ice present in stellar envelopes. Despite the clear presence of H_2O ice around other, previously observed, evolved stars, our search in six OH/IR stars has resulted in only one clear detection, in OH 26.5+0.6, and the tentative detection in one other, OH 26.4-1.9. We provide column densities or upper limits for the amount of ice that is present on the grains around these stars and explore the possibility that there could be a relationship between M_* or M_*/L_* and the H_2O ice column density to explain the observations.

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