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Shelyak Grating module for the UVEX - 300 l/mm

Shelyak Grating module for the UVEX - 300 l/mm

par Shelyak
UGC SHK-SE0243
CA$992.00 - CA$992.00
CA$992.00
CA$992.00 - CA$992.00
CA$992.00
Égalisation de prix!
  • 300 lines/mm Grating Density
  • Optional Interchangeable Module
  • Designed for the Shelyak UVEX Spectroscope
  • Lower Resolution, Wider Spectral Coverage
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Grating module for the UVEX - 300 l/mm

    This optional Grating Module for the Shelyak UVEX spectroscope features a line density of 300 lines/mm, offering a different balance of resolution and spectral coverage compared to the standard 600 l/mm grating. It is a key component in a modular system that includes gratings from 150 l/mm up to 1800 l/mm, allowing you to tailor the instrument's capabilities to specific scientific targets.

    The 300 l/mm Grating: Balancing Resolution and Spectral Range

    In spectroscopy, grating choice dictates a fundamental trade-off. The 300 lines/mm grating disperses incoming light less aggressively than higher-density gratings. This results in lower spectral resolution but allows a significantly wider range of wavelengths to fit onto your camera's sensor in a single exposure.

    This capability is critical for survey work, initial classification of variable stars or supernovae, and studying objects with very broad spectral features. For faint targets, concentrating the light over a smaller sensor area can also improve the signal-to-noise ratio for the overall spectrum, making it a valuable tool for capturing data on challenging objects.

    Choosing Your Grating: 300 l/mm vs. the 600 l/mm Standard

    While the UVEX's standard 600 l/mm grating provides an excellent general-purpose balance for many projects, the 300 l/mm module serves a specific and complementary role. You would choose the 300 l/mm grating when your scientific goal prioritizes wavelength coverage over fine detail.

    • 300 l/mm Grating: Best for wide-field spectroscopy. Use it to capture the full spectrum of a nova from the hydrogen-alpha to hydrogen-beta lines in one frame, or for classifying multiple stars in a cluster simultaneously.
    • 600 l/mm Grating (Standard): The versatile workhorse. Ideal for resolving the double-peaked emission lines in Be stars or studying the detailed structure of planetary nebulae spectra.
    • Higher Density Gratings (1200/1800 l/mm): These are reserved for high-resolution studies of single, narrow spectral lines, such as measuring the radial velocity of a star via Doppler shift.

  • What is the primary use for the Shelyak UVEX 300 l/mm grating?

    The 300 l/mm grating is designed for low-resolution spectroscopy where capturing a wide range of wavelengths in a single image is more important than resolving fine details. It is ideal for survey projects, classifying unknown objects, and studying targets with broad spectral features like supernovae or novae.

    How does the 300 l/mm grating compare to the standard 600 l/mm grating included with the UVEX?

    The 300 l/mm grating provides half the spectral resolution of the standard 600 l/mm grating. In exchange, it covers a much wider spectral range on the same sensor. The 600 l/mm is a general-purpose tool for detailed analysis, while the 300 l/mm is a specialized tool for wide-field spectroscopic surveys.

    When would I choose the 300 l/mm grating for observing a nova like Nova Persei (GK Persei)?

    For a nova, especially in its early, rapidly evolving stages, the 300 l/mm grating is an excellent choice. It allows you to capture the entire visible spectrum, including the broad P Cygni profiles and multiple emission lines (like the Balmer series), in a single exposure to monitor its overall evolution. A higher-resolution grating might require multiple exposures and mosaicking to cover the same range.

    Will the 300 l/mm grating fit my Shelyak UVEX spectroscope?

    Yes. This grating is specifically designed as an interchangeable module for the Shelyak UVEX spectroscope, allowing you to easily swap it with the standard 600 l/mm grating or other optional gratings in the series.

    Is the 300 l/mm grating better for faint objects than the 1200 l/mm grating?

    Yes, for capturing a detectable spectrum. The 300 l/mm grating concentrates the faint light over a smaller area on the sensor, improving the signal-to-noise ratio of the overall spectrum. The 1200 l/mm grating spreads that same faint light out much further, which can make the resulting high-resolution spectrum too dim to be useful without very long exposures.

    Can I use the 300 l/mm grating to measure the redshift of a quasar like 3C 273?

    Yes, this is an excellent application for the 300 l/mm grating. The broad emission lines of a quasar like 3C 273 are easily visible at this resolution, and the wide spectral coverage helps you identify multiple lines to confirm the redshift. The goal is to identify the pattern of shifted lines, not to resolve their internal structure, making low resolution ideal.

  • Product Grating Module
    Instrument Shelyak UVEX Spectroscope
    Grating Density 300 lines/mm

    • Grating Module for UVEX (300 l/mm)

      × 1

  • Shelyak 1-Year Warranty