Long slit spectroscopy
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LONG-SLIT SPECTROSCOPY. Characteristic optical spectra: emission lines; weak or lack continuum. [SII] images of HH 83. Relative line strengths vary along the jet. Reipurth, A&A, 220, 249 (1989 ). Continuum contribution from the source. Spectra at different distances from the source. PA.

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Long slit spectroscopy
LONG-SLIT SPECTROSCOPY

Characteristic optical spectra: emission lines; weak or lack continuum


[SII] images of HH 83.

Relative line strengths vary along the jet.

Reipurth, A&A, 220, 249 (1989)


Continuum contribution

from the source

Spectra at different distances from the source


PA

Ex: HH223


2006:NOT/ALFOSC PA 96

HH 223

star

Lambda

[SII]

Ha+[NII]

[OI]

Pixel (1=0.19´´)

E

W


Ha

1D spectrum

[OI]

[NII]

[SII]

~3 arcsec

Mapa P-V

Red

Blue

A

B



Physical
Physical HH223

The knots move away from the source with velocities in the range 100-200 km/swith a large spread (velocities as high as 500 km/s have been measured).

In contrast, the shock velocities (inferred from their spectrum) never exceed 100 km/s.

Estimated electron densities are typically in the range 100-1000 cm-3.

Ionization fractions are quite uncertain but have estimated values around 0.1.

Derived

Flow velocities:100- 500 km/s

Mass loss rates: (quite uncertain) : 10-9 to 10-7 Msun/yr.

Momentum rates:10-7 and 10-5 Msun/yr km/s ( much greater than the momentum rate available in radiation Lsource/c).

Mechanical luminosities: typically around one solar luminosity.


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