HR Diagram Inference Lab
Exhibit: HR Diagram Inference Lab
This station card is in beta and still being developed. Its content has not been rechecked
against the current instrument, so treat numbers and labels as provisional.
Context
This station is designed to be completed quickly. Write a prediction, follow the steps, then make a claim supported by evidence from the demo.
Predict
Before revealing mass colors, predict where high-mass and low-mass stars should lie along the main sequence.
Prediction (1 sentence):
Play steps
- Start in Observer CMD mode and identify main sequence, giant-branch, and white-dwarf structures.
- Switch to Theorist HR mode and enable radius lines to infer stellar size from L and T_eff.
- Use the evolve-a-star tool to compare track shape and timescale for 0.8 and 20 M_sun stars.
- Reveal mass colors and infer the hidden mass gradient direction along the main sequence.
- Add one-sentence claims to the inference log and export JSON.
Parameter table
| Parameter | Value | What to notice |
|---|---|---|
| Mass M | 1 Msun | Use as a baseline before moving to higher or lower masses. |
| Metallicity Z | 0.02 | Solar-neighborhood reference for initial comparisons. |
Explain
Explain how the same population can be interpreted as an observer CMD and a theorist HR map, then justify one radius and one mass inference.
Explanation (2–3 sentences):
Claim + evidence
Claim:
Evidence (what you observed):