astronomy

PG 1159-035

PG 1159-035 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 PG 1159-035 rather than just read about it. In short: PG 1159-035 is the prototypical PG 1159 star after which the class of PG 1159 stars was named. It was discovered in the Palomar-Green survey of ultraviolet-excess stellar objects and, like the other PG 1159 stars, is in transition between being the central star of a planetary nebula and being a white dwarf.

Key takeaways

PG 1159-035 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect PG 1159-035 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of PG 1159-035 from memory before moving on to harder problems.

Reference excerpt

PG 1159-035 is the prototypical PG 1159 star after which the class of PG 1159 stars was named. It was discovered in the Palomar-Green survey of ultraviolet-excess stellar objects and, like the other PG 1159 stars, is in transition between being the central star of a planetary nebula and being a white dwarf. The luminosity of PG 1159-035 was observed to vary in 1979, and it was given the variable star designation GW Virginis (abbreviation GW Vir) in 1985. Variable PG 1159 stars may be called GW Vir stars, or the class may be split into DOV and PNNV stars. The variability of PG 1139-035, like that of other GW Vir stars, arises from non-radial gravity wave pulsations within itself. Its light curve was observed intensively by the Whole Earth Telescope over a 264-hour period in March 1989, and over 100 of its vibrational modes have been found in the resulting vibrational spectrum, with periods ranging from 300 to 1,000 seconds.

References

Illustrations

Worked examples

Example 1 — a first encounter with PG 1159-035

Start with the simplest possible case. Write down what PG 1159-035 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 PG 1159-035 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 PG 1159-035 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 PG 1159-035

In research: PG 1159-035 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 PG 1159-035 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: PG 1159-035 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Objects with variable star designations, Pulsating white dwarfs, Virgo (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for PG 1159-035 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 PG 1159-035 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what PG 1159-035 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 PG 1159-035 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is PG 1159-035 in simple terms?

Why does PG 1159-035 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 PG 1159-035?

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 PG 1159-035.