astronomy

HE 1219−0312

HE 1219−0312 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 HE 1219−0312 rather than just read about it. In short: HE 1219−0312 is an extremely metal-poor star in the constellation Virgo. The star is located at around 41,400 light-years away from Earth.

Key takeaways

HE 1219−0312 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect HE 1219−0312 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of HE 1219−0312 from memory before moving on to harder problems.

Reference excerpt

HE 1219−0312 is an extremely metal-poor star in the constellation Virgo. The star is located at around 41,400 light-years away from Earth. It is thought to be a second generation, Population II or metal-poor star ([Fe/H] = −2.96), The star was found in the sample of extremely metal-poor halo stars from the Hamburg/ESO Survey by W. Hayek and collaborators. The group's research was published in the July 2, 2009 issue of The Astrophysical Journal.

Elemental abundance The elemental abundances of two strongly r-process enhanced metal-poor stars, BPS CS29491−0069 and HE 1219−0312, were measured by the HERES project, resulting in a value of [Fe/H] = –2.96 and [r/Fe] = +1.5 for HE 1219−0312. The analysis based on high-quality VLT/UVES spectra and MARCS model atmosphere was detected these eighteen heavy elements in the spectrum of HE 1219−0312 with a case of Th II 4019A line. Radioactive dating for HE 1219−0312 with the observed thorium and rare-earth elements abundance pairs results in an age of 9.5 ± 6.0 billion years. When based on solar r-process residuals, an age of 17.6 ± 6.8 billion years is obtained. This roughly matches the typical age range for previously discovered metal-poor halo stars of 11–12 billion years.

See also HD 140283 HE 0107−5240 HE 1523−0901

References

Worked examples

Example 1 — a first encounter with HE 1219−0312

Start with the simplest possible case. Write down what HE 1219−0312 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 HE 1219−0312 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 HE 1219−0312 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 HE 1219−0312

In research: HE 1219−0312 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 HE 1219−0312 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: HE 1219−0312 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Population II stars, Virgo (constellation), so understanding it makes those chapters shorter.
In everyday life: Look for HE 1219−0312 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 HE 1219−0312 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what HE 1219−0312 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 HE 1219−0312 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is HE 1219−0312 in simple terms?

HE 1219−0312 is an extremely metal-poor star in the constellation Virgo. The star is located at around 41,400 light-years away from Earth.

Why does HE 1219−0312 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 HE 1219−0312?

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 HE 1219−0312.