Resumen

RODRIGUEZ, L. F.; RAGA, A. C.; RODRIGUEZ-KAMENETZKY, A.  y  CARRASCO-GONZALEZ, C.. A comparison of the radio and optical time-evolution of HH 1 and 2. Rev. mex. astron. astrofis [online]. 2018, vol.54, n.1. ISSN 0185-1101.

We present a comparison between the time-evolution over the past ≈ 20 years of the radio continuum and Hα emission of HH 1 and 2. We find that the radio continuum and the Hα emission of both objects show very similar trends, with HH 1 becoming fainter and HH 2 brightening quite considerably (by about a factor of 2). We also find that the FHα/Fff (Hα to free-free continuum) ratio of HH 1 and 2 has higher values than the ones typically found in planetary nebulae (PNe), which we interpret as an indication that the Hα and free-free emission of HH 1/2 is produced in emitting regions with lower temperatures (≈ 2000 K) than the emission of PNe (with ≈ 104 K).

Palabras llave : Herbig-Haro objects; ISM: individual objects: HH1/2; ISM: jets and outflows; ISM: kinematics and dynamics; shock waves; stars: winds; outflows.