Knots in stellar jets from time-dependent sources

Abstract

view Abstract Citations (115) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Knots in Stellar Jets from Time-dependent Sources Raga, A. C. ; Kofman, Lev Abstract An analytical model is presented that describes the time evolution of a highly supersonic jet of small opening angle ejected from a time-dependent source. This model is used to explore the possibility that the aligned knots observed along astrophysical (and in particular, stellar) jets might be the result of 'internal working surfaces' produced in the jet flow as a result of a time-dependent ejection velocity. This model allows very concrete predictions of the shock velocities, H-alpha luminosities and characteristic masses of the knots in a stellar jet. A comparison is made between these predictions and previously existing observations of the HH 34 outflow (which has a very well-defined, jetlike structure), and good agreement is found between theoretical predictions and observations. Publication: The Astrophysical Journal Pub Date: February 1992 DOI: 10.1086/171008 Bibcode: 1992ApJ...386..222R Keywords: Herbig-Haro Objects; Jet Flow; Pre-Main Sequence Stars; Stellar Mass Ejection; Stellar Structure; Stellar Winds; H Alpha Line; Interstellar Gas; Shock Wave Propagation; Stellar Models; Time Dependence; Astrophysics; ISM: JETS AND OUTFLOWS; SHOCK WAVES; STARS: PRE--MAIN-SEQUENCE full text sources ADS | data products SIMBAD (1)