Publ. Astron. Soc. Pac., 109, 549-553 (1997/May-0)
Herbig-haro objects in the rho Ophiuchi cloud.
WILKING B.A., SCHWARTZ R.D., FANETTI T.M. and FRIEL E.D.
Abstract (from CDS):
Using deep, narrow-band images of the main ρ Oph dark cloud centered on the wavelengths of Hα and [S∼II], we present evidence for three new Herbig-Haro objects. This increases the total number in the cloud to five. In addition, positions for 5 candidate Herbig-Haro objects are given. Relatively high [S∼II]/Hα ratios indicate low excitation conditions for all of these nebulae. We list potential exciting stars for each Herbig-Haro object and candidate by identifying nearby young stellar objects with strong infrared excesses and/or millimeter continuum emission. The location of most of these nebulae near the cloud edges underscores the important role that extinction by dust plays in the ρ Oph cloud in masking the presence of Herbig-Haro objects. Among the newly identified Herbig-Haro objects is a jet-like string of emission nebulae emanating from the classical T Tauri star SR∼4. [S∼II] emission is also found coincident with a knot of strong molecular hydrogen emission associated with the highly-collimated VLA∼1623 molecular outflow. Indeed, the low excitation nature of all of the objects in our study, coupled with the high extinction of the cloud, suggests that a deep survey for shocked molecular hydrogen at λ=2.122 µm would be the best way to search for evidence of strong winds from the large population of young stellar objects in the cloud.
Interstellar Medium and Nebulae
Table 1: HH NNN (Nos 224, 312-314). Table 1: [WSF97] CNW (Nos C1, C3, C4N-C4S, C5, C6)
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