Observations of interstellar and circumstellar ice

Aikawa, Y.; Noble, J. A.; Sakon, I.; Kamuro, D.; Irimichi, N.; Pontoppidan, K.M.; Fraser, H.; Tamura, M.; Terada, H. and Ueno, M. (2009). Observations of interstellar and circumstellar ice. In: Onaka, Takashi; White, Glenn J.; Nakagawa, Takao and Yamamura, Issei eds. AKARI, a Light to Illuminate the Misty Universe. Astronomical Society of the Pacific Conference Series (418). San Francisco, CA: Astronomical Society of the Pacific, pp. 47–55.

Abstract

We observed ice absorption bands at NIR (2.5 μm–5.0 μm) towards field stars behind molecular clouds and low-mass YSOs with edge-on disk. We developed and tested a procedure to reduce the slitless spectroscopy data of extended object and the data with multiple objects in one field of view. Absorption bands of H₂O, CO₂ and CO are clearly detected towards field stars and YSOs. The spectral type and visual extinction of each field star are estimated using color-color diagram. The visual extinction of our field stars ranges from 15 mag to 25 mag. The column density of H₂O ice towards our target stars ranges from 3×10¹⁷ cm-2 to 1×10¹⁹ cm^-2, while the CO₂ ice column density is (1–7)×10¹⁷ cm^-2. These ice column densities are found to be roughly proportional to visual extinction.

Viewing alternatives

Item Actions

Export

You can export this page using these formats