Herbig-Haro flows near compact reflection nebulae

Citation
C. Aspin et B. Reipurth, Herbig-Haro flows near compact reflection nebulae, M NOT R AST, 311(3), 2000, pp. 522-534
Citations number
68
Categorie Soggetti
Space Sciences
Journal title
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN journal
00358711 → ACNP
Volume
311
Issue
3
Year of publication
2000
Pages
522 - 534
Database
ISI
SICI code
0035-8711(20000121)311:3<522:HFNCRN>2.0.ZU;2-P
Abstract
We have performed an optical CCD imaging survey of star-forming regions ide ntified through compact reflection nebulae and/or embedded IRAS sources in order to search for new Herbig-Haro (HH) flows. Here we present the discove ry of hitherto unknown HH objects in seven of these regions. A bright bow s hock, HH 461, is found along the axis defined by the previously known HH 16 4 jet from the luminous young A star LkH alpha 198. The little-known cometa ry nebula PP 11, illuminated by the partly embedded IRAS source 03507+3801 in the Perseus clouds, contains an HH object HH 462, found along the symmet ry axis of the nebula. A small jet, HH 463, emanates from the recently iden tified FU Orionis candidate PP 13S, while another HH flow, HH 464/HH 465, a ppears to originate from the nearby T Tauri star PP 13N. A group of HH obje cts, HH 466-468, are located around the nebulous young T Tauri binary GK Ta u. A well-collimated HH jet and an associated bow shock, HH 470, are found extending from the young nebulous T Tauri star Haro 4-255 in Orion, and a t iny reflection nebula and associated HH object, HH 469, are located close b y the deeply embedded Class I source Haro 4-255 FIR. In light of these new HH flows in Haro 4-255, we re-interpret existing (CO)-C-12 data on this sou rce in terms of two overlapping molecular outflows. The young star LkH alph a 316 and the nearby IRAS source 05451+0037 in Orion are found to be associ ated with a cluster of HH objects, HH 471-474. It is likely that a nearby a nd previously identified HH object, HH 71, also originates in this region. Finally, a chain of HH objects, HH 475, is found near the little-studied co mpact bipolar reflection nebula PP 95 in the Cygnus clouds. The origin of t his HH chain remains unclear, and HH 475 may equally well be driven by one of several luminous massive young stars in the region.