LkH alpha 198 Revisited

Details LkH alpha 198 Revisited LkH alpha 198 Revisited

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...440..874b&link_type=abstract

Astrophysical Journal v.440, p.874

Astronomy and Astrophysics

Astronomy

8

Infrared: Stars, Stars: Emission-Line, Be, Stars: Individual Alphanumeric: Lkh Alpha 198

Scientific paper

This paper examines the nature of deeply embedded sources found in association with optically visible Herbig Ae/Be stars, such as the recently discovered 10 microns object LkHα 198-IR. The possibility that such deeply embedded objects, instead of the optical stars, are responsible for the extended far-infrared emission detected by the Kuiper Airborne Observatory is investigated by using three types of models. The first considers LkHα 198-IR to be a star embedded in a dense cloud and the only source responsible for the far-infrared emission. The second set of models replaces the embedded star with an embedded star + disk system. The third set of models has both LkHα 198-IR and LkHα 198-OP (the optical star) as sources of equal luminosity, where LkHα 198-IR is in the center of a dense cloud and the optical star is at the edge. We argue, based on these results, that the extended far-infrared emission is most likely associated with LkHα 198-OP, and, more generally, that the extended far-infrared emission seen around many Herbig Ae/Be stars is associated with the known optical star rather than any deeply embedded companion.
By combining our models with existing submillimeter observations, we suggest that in the LkHα 198 region we are seeing a roughly spherical cloud of moderate mass and thickness, characterized by a rather flat density, which contains LkHα 198-OP and, possibly, LkHα 198-IR. The large extinction toward the latter, revealed by the deep 10 microns absorption feature seen against it, is best explained as arising in a thick circumstellar disk.

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