A COMPARISON OF THE RADIO AND OPTICAL TIME-EVOLUTION OF HH 1 AND 2

RODRÍGUEZ, L. F.; RAGA, A. C.; RODRÍGUEZ-KAMENETZKY, A.; CARLOS CARRASCO-GONZÁLEZ

REVISTA MEXICANA DE ASTRONOMíA Y ASTROFíSICA

UNIV NACIONAL AUTONOMA MEXICO

Lugar: México; Año: 2018 vol. 54 p. 57 - 64

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 (about a factor of 2). We also find that the F Hα /F f f (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 ∼ 10 4 K).