astronomy

NO Aurigae

NO Aurigae is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand NO Aurigae rather than just read about it. In short: NO Aurigae is a pulsating variable star in the constellation Auriga. It is an unusually luminous asymptotic giant branch star about 3,500 light-years away.

Key takeaways

NO Aurigae belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect NO Aurigae to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of NO Aurigae from memory before moving on to harder problems.

Reference excerpt

NO Aurigae is a pulsating variable star in the constellation Auriga. It is an unusually luminous asymptotic giant branch star about 3,500 light-years away. It is a 6th-magnitude star faintly visible to the naked eye under very good observing conditions.

Variability

In 1969, Olin Jeuck Eggen announced that the star, then called HR 1939, is a variable star. It was given its variable star designation in 1972. NO Aurigae is listed in the General Catalogue of Variable Stars as a slow irregular variable, indicating that no regularity could be found in the brightness variations. Other studies have suggested possible periods of 102.1, 173, and 226 days, and would classify it as a semiregular variable star. The maximum visual magnitude range is 6.05–6.50.

Properties Most studies of NO Aurigae treat it as a red supergiant member of the Auriga OB1 stellar association at about 1.4 kpc. On this basis it would have a luminosity around 67,000 L☉ and a radius around 630 R☉. NO Aurigae is an MS star, intermediate between spectral type M and S. These are typically asymptotic giant branch stars which can appear with supergiant spectra due to their large size and low mass. Possible detection of technetium in the spectrum is a symptom of the third dredge-up which occurs only in late AGB stars.

References

External links VSX Entry

Illustrations

Worked examples

Example 1 — a first encounter with NO Aurigae

Start with the simplest possible case. Write down what NO Aurigae claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to NO Aurigae before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about NO Aurigae ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of NO Aurigae

In research: NO Aurigae appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses NO Aurigae in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: NO Aurigae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Asymptotic-giant-branch stars, Auriga, Bright Star Catalogue objects, so understanding it makes those chapters shorter.
In everyday life: Look for NO Aurigae outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “NO Aurigae” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study NO Aurigae in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what NO Aurigae means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain NO Aurigae out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is NO Aurigae in simple terms?

NO Aurigae is a pulsating variable star in the constellation Auriga. It is an unusually luminous asymptotic giant branch star about 3,500 light-years away.

Why does NO Aurigae matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study NO Aurigae?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on NO Aurigae.