astronomy

V1315 Aquilae

V1315 Aquilae 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 V1315 Aquilae rather than just read about it. In short: V1315 Aquilae is a cataclysmic variable star in the north of the equatorial constellation of Aquila. It is in the sub-set of nova-like (NL) variables, specifically a SW Sextantis star (a type of white dwarf-donor star pair).

Key takeaways

V1315 Aquilae belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect V1315 Aquilae to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of V1315 Aquilae from memory before moving on to harder problems.

Reference excerpt

V1315 Aquilae is a cataclysmic variable star in the north of the equatorial constellation of Aquila. It is in the sub-set of nova-like (NL) variables, specifically a SW Sextantis star (a type of white dwarf-donor star pair). These were characterized as having non-magnetic white dwarfs – thus that do not undergo dwarf-nova bright luminations ("eruptions"). There is countering evidence for some magnetism. Being a SW Sextantis star, V1315 Aquilae has a high rate of mass transfer, so it is in steady-state accretion and in a constant state of outburst. It emits most of its light in the visible range, and this comes from the accretion disk. The eclipse depth is 1.8 mag. No description of the donor star is made. L. P. Metik discovered the star in 1961. Rather unusually, the discovery paper does not give the celestial coordinates of the object, but instead presents a map showing where the star is located in the sky relative to nearby stars. The star was given its variable star designation, V1315 Aquilae, in 1977.

Nova shell V1315 Aquilae has a roughly spherical shell of material around it with a maximal 1×10−5 solar masses (1⁄10000 M☉), which is too small to be any starburst nebula or more advanced supernova remnant. It is consistent with models of a remnant of a nova-scale eruption roughly 500 to 1200 years old (that is, plus the time for the light from this system to travel to the Earth). V1315 Aquilae is the first nova-like system to have been discovered with a nova shell.

References

Illustrations

Worked examples

Example 1 — a first encounter with V1315 Aquilae

Start with the simplest possible case. Write down what V1315 Aquilae 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 V1315 Aquilae 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 V1315 Aquilae 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 V1315 Aquilae

In research: V1315 Aquilae 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 V1315 Aquilae 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: V1315 Aquilae is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aquila (constellation), Cataclysmic variable stars, Eclipsing binaries, so understanding it makes those chapters shorter.
In everyday life: Look for V1315 Aquilae 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 V1315 Aquilae in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what V1315 Aquilae 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 V1315 Aquilae out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is V1315 Aquilae in simple terms?

Why does V1315 Aquilae 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 V1315 Aquilae?

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 V1315 Aquilae.