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On temperature determinations from nonresolved spectra.

R Watson, W G Planet, C C Pitts

|January 14, 2010

Summary

This summary is machine-generated.

Interpreting film spectrograms from low-intensity sources requires careful densitometry. This study reveals that temperature measurements are most accurate away from prominent band heads, minimizing spectral line spread function effects.

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Area of Science:

Astrophysics
Spectroscopy
Photographic Spectroscopy

Background:

Low-intensity astronomical sources often yield film spectrograms with large, overlapping spectral lines (nonresolved case).
Accurate interpretation of densitometer scans from these photographic spectra is crucial for determining source temperatures.
Existing methods may be affected by the characteristics of spectral line images and the densitometer's line spread function.

Purpose of the Study:

To investigate the impact of combined line spread functions and image sizes on densitometer scan outputs for nonresolved film spectra.
To apply these findings to the determination of spectroscopic temperatures for the CN violet system.
To identify optimal spectral regions for accurate temperature measurements from photographic spectra.

Main Methods:

Simulating densitometer scans of nonresolved film spectra using various assumed line spread functions and image sizes.
Analyzing the resulting scan data to quantify the effects of these parameters.
Applying the analysis to spectroscopic temperature determination of the CN violet system.

Main Results:

Different line spread functions and image sizes significantly alter densitometer scan outputs for nonresolved spectra.
The presence of prominent band heads introduces substantial distortions in the spectral line profiles.
Spectroscopic temperature determinations are demonstrably affected by these instrumental and spectral features.

Conclusions:

Accurate spectroscopic temperature determination from nonresolved film spectra necessitates accounting for line spread function effects.
Densitometry should be performed in spectral regions with minimized line spread function influence, typically away from band heads.
This research highlights critical considerations for analyzing photographic spectra of low-intensity sources.