astronomy

V701 Coronae Australis

V701 Coronae Australis 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 V701 Coronae Australis rather than just read about it. In short: V701 Coronae Australis (HD 176723; HR 7197; 40 G. Coronae Australis), or simply V701 CrA, is a solitary, yellowish-white hued variable star located in the southern constellation Corona Australis.

Key takeaways

V701 Coronae Australis belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect V701 Coronae Australis to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of V701 Coronae Australis from memory before moving on to harder problems.

Reference excerpt

V701 Coronae Australis (HD 176723; HR 7197; 40 G. Coronae Australis), or simply V701 CrA, is a solitary, yellowish-white hued variable star located in the southern constellation Corona Australis. It has an average apparent magnitude of 5.72, making it faintly visible to the naked eye under ideal conditions. The object is located relatively close at a distance of 213 light-years based on Gaia DR3 parallax measurements, and it is currently receding with a poorly constrained heliocentric radial velocity of 4 km/s. At its current distance, V701 CrA's brightness is diminished by a quarter of a magnitude due to extinction and it has an absolute magnitude of +1.55.

The object was first suspected to be variable in 1990. The variations matched that of δ Scuti variables. Three years later, it was confirmed to be variable and was given the variable star designation V701 Coronae Australis. It ranges from magnitude 5.69 to 5.73 within 3.25 hours. V701 CrA has a stellar classification of F2 III/IV, indicating that it is an evolved F-type star with the blended luminosity class of a subgiant and giant star. It has also been given a class of F0 IIIn, indicating broad or nebulous absorption lines due to rapid rotation. It has 1.83 times the mass of the Sun and a slightly enlarged radius of 2.85 R☉. It radiates 17.5 times the luminosity of the Sun from its photosphere at an effective temperature of 7,046 K. The star spins rapidly with a projected rotational velocity of 265 km/s, which causes it to have an equatorial bulge that is 26% larger than the poles. It is metal deficient with an iron abundance 62% that of the Sun ([Fe/H] = −0.21) and it is estimated to be 1.25 billion years old. V701 CrA was considered to be a chemically peculiar star and was given a class of FpSr. Its peculiarity is now considered to be doubtful.

References

Illustrations

Worked examples

Example 1 — a first encounter with V701 Coronae Australis

Start with the simplest possible case. Write down what V701 Coronae Australis 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 V701 Coronae Australis 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 V701 Coronae Australis 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 V701 Coronae Australis

In research: V701 Coronae Australis 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 V701 Coronae Australis 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: V701 Coronae Australis is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bright Star Catalogue objects, Corona Australis, Delta Scuti variables, so understanding it makes those chapters shorter.
In everyday life: Look for V701 Coronae Australis 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.

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How to study V701 Coronae Australis in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what V701 Coronae Australis 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 V701 Coronae Australis out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is V701 Coronae Australis in simple terms?

V701 Coronae Australis (HD 176723; HR 7197; 40 G. Coronae Australis), or simply V701 CrA, is a solitary, yellowish-white hued variable star located in the southern constellation Corona Australis.

Why does V701 Coronae Australis 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 V701 Coronae Australis?

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 V701 Coronae Australis.