Long slit spectroscopy
This presentation is the property of its rightful owner.
Sponsored Links
1 / 9

LONG-SLIT SPECTROSCOPY PowerPoint PPT Presentation


  • 102 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

LONG-SLIT SPECTROSCOPY

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Long slit spectroscopy

LONG-SLIT SPECTROSCOPY

Characteristic optical spectra: emission lines; weak or lack continuum


Long slit spectroscopy

[SII] images of HH 83.

Relative line strengths vary along the jet.

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


Long slit spectroscopy

Continuum contribution

from the source

Spectra at different distances from the source


Long slit spectroscopy

PA

Ex: HH223


Long slit spectroscopy

2006:NOT/ALFOSC PA 96

HH 223

star

Lambda

[SII]

Ha+[NII]

[OI]

Pixel (1=0.19´´)

E

W


Long slit spectroscopy

Ha

1D spectrum

[OI]

[NII]

[SII]

~3 arcsec

Mapa P-V

Red

Blue

A

B


Long slit spectroscopy

1D spectra, integrated the emission, for different knots of HH223


Physical

Physical

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.


  • Login