Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116..868i&link_type=abstract
The Astronomical Journal, Volume 116, Issue 2, pp. 868-880.
Astronomy and Astrophysics
Astronomy
17
Stars: Circumstellar Matter, Ism: Dust, Extinction, Stars: Pre-Main-Sequence
Scientific paper
We present the results of spectrophotometry from 1.3 to 4.2 mum of 45 IRAS sources in the list of Campbell, Persson, & Matthews that have been presumed to be luminous young stellar objects because of their infrared colors and large IRAS fluxes. About 70% of the objects show 3.1 mum H_2O ice absorption or 3.3 mum unidentified infrared emission, or both. Among those with 3.1 mum H_2O ice absorption, three objects seem to have a distinct absorption near 3.4 mum, and their absorption profiles are different than the optical depth profiles of young stellar objects in the literature. In the HKL two-color diagram, objects with ice absorption occupy the same region as previously known young stellar objects with the ice feature, and those with unidentified infrared emission overlap with Herbig Ae/Be stars. We interpret the distribution in the HKL two-color diagram as indicating the evolutionary sequence of intermediate- to high-mass young stars.
Ishii Miki
Jones Terry Jay
Nagata Tetsuya
Sato Shuji
Watanabe Makoto
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