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Evolution of Stellar Taxonomy: Spectral Classification System Update

Explore the revised K-M sequence for fast stellar properties identification integrated with photometric colors. Learn about new subtypes and consistent categorization for various star types.

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Evolution of Stellar Taxonomy: Spectral Classification System Update

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  1. Adric Riedel 20070904 The taxonomy of tiny starsNow with more eyestrain

  2. Spectral Classification • A shorthand for describing many stellar properties in one easy-to-digest identifier. Temperature Luminosity Composition

  3. Spectral Classification • Current (Morgan, Keenan, & Kellman) general system is 2-dimensional. • Other systems exist • DA, DB, DC, DQ, DZ (white dwarfs) • WC, WN, and WO (Wolf-Rayet stars) • S, N, R (Morgan & Keenan Carbon star sequence) M4.5Ve Type Luminosity Class Notes

  4. Why redo the M-K main sequence? • Originally done with low-resolution spectra • Traditionally ends at M2V • Subtypes are inconsistent or missing • O3, O5, O7, O8, O9, O9.5, B0 • K0, K1, K2, K3, (K4), K5, K7, M0…

  5. Finding Standards No binaries No subdwarfs No variables None of this No giants

  6. The New K-M sequence • 10 K types (K0V-K9V) • 19 M half-types (M0.0V-M9.0V) “G9” K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 M0

  7. The New K-M sequence K0 K1 K2 K3 K4 K5 K7 K6 Now with Photometric Colors! K8 K9 M0 M1 M2 M3 M4 M5 M6 M7 M8 M9

  8. Notes on the new K-M system “G9” K0 K1 K2 K3 K4 K5 K6 K7 K8 K9 M0

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