science

WD 1337+705

WD 1337+705 is a science 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 WD 1337+705 rather than just read about it. In short: WD 1337+705 (G238-44) is a star in the constellation Ursa Minor. Shining with an apparent magnitude of 12.8, it is white dwarf 0.59 times as massive as the Sun.

Key takeaways

WD 1337+705 belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect WD 1337+705 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of WD 1337+705 from memory before moving on to harder problems.

Reference excerpt

WD 1337+705 (G238-44) is a star in the constellation Ursa Minor. Shining with an apparent magnitude of 12.8, it is white dwarf 0.59 times as massive as the Sun. It is 86.5 light-years distant from Earth. It has 3% of the Sun's luminosity. In 1997, Jay Holberg and colleagues discovered magnesium in its spectrum, which suggests that it has some low mass companion or accretion of material happening as the star's temperature is not hot enough for its intrinsic emission. Despite this, no direct evidence for a circumstellar disc, such as an infrared excess, has come to light. In 2022 a team of researchers found that the metal-pollution of this white dwarf is unusual. The presence of iron in the atmosphere indicates that an iron-rich minor planet was accreted. This object formed close to the star with a Mercury-like composition. The presence of nitrogen on the other hand shows that an icy Kuiper Belt Object was accreted as well. This nitrogen is usually stored in ices, such as N2 and ammonia. KBOs are also rich in other ices (H2O, CO, CO2) containing carbon and oxygen, which are also present in this white dwarf. Other detected elements are Magnesium, Aluminium, Silicon, Phosphorus, Sulfur and Calcium. The accreted KBO was 7.1 times more massive than the Mercury-like object. The white dwarf formed from a main-sequence star around 50 Myrs ago. Simulations have shown that it is possible for both main-belt asteroids and KBOs to be delivered within the first 100 Myrs.

See also List of exoplanets and planetary debris around white dwarfs WD 1425+540, the first white dwarf to be found to be polluted with nitrogen LSPM J0207+3331 another white dwarf polluted by more than one object

References

Illustrations

Worked examples

Example 1 — a first encounter with WD 1337+705

Start with the simplest possible case. Write down what WD 1337+705 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 WD 1337+705 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 WD 1337+705 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 WD 1337+705

In research: WD 1337+705 appears in science 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 WD 1337+705 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: WD 1337+705 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hipparcos objects, Ursa Minor, White dwarfs, so understanding it makes those chapters shorter.
In everyday life: Look for WD 1337+705 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 WD 1337+705 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what WD 1337+705 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 WD 1337+705 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is WD 1337+705 in simple terms?

WD 1337+705 (G238-44) is a star in the constellation Ursa Minor. Shining with an apparent magnitude of 12.8, it is white dwarf 0.59 times as massive as the Sun.

Why does WD 1337+705 matter?

Because it connects several science 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 WD 1337+705?

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 WD 1337+705.