astronomy

ROXs 12

ROXs 12 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 ROXs 12 rather than just read about it. In short: ROXs 12 is a member of a binary system of pre-main-sequence stars. It belongs to the Rho Ophiuchi cloud complex.

Key takeaways

ROXs 12 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect ROXs 12 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of ROXs 12 from memory before moving on to harder problems.

Reference excerpt

ROXs 12 is a member of a binary system of pre-main-sequence stars. It belongs to the Rho Ophiuchi cloud complex. The surface temperature of the primary star is 3900±100 K. ROXs 12 is much younger than the Sun with an age of 7.6+4.1−2.5 million years. A multiplicity survey detected a stellar companion to ROXs 12 in 2017, named 2MASS J16262774–2527247, at a projected separation of 5100 AU. 2MASS J16262774–2527247 is also a pre-main-sequece star with a mass of 0.8 M☉.

Planetary system In 2005, one planet was discovered on a wide orbit by direct imaging, was confirmed in 2013 and named ROXs 12 b. The planet's measured temperature is 3100+400−500 K. The spectroscopy of the planet was obtained with Keck and Gemini, revealing a low surface gravity and a spectral type of L0±2, making this object either a late M-dwarf or an early L-dwarf. The signs of low gravity includes weak alkali absorption and a triangular H-band spectrum shape. The study also found misalignment between the line-of-sight inclinations of ROXs 12A and 2MASS J16262774–2527247. ROXs 12 B is also likely misaligned with its host star. This was interpreted as either formation similar to fragmenting binary stars or ROXs 12B formed in an equatorial disk that was torqued by 2MASS J16262774–2527247. This study also found strong signs of accretion around 2MASS J16262774–2527247 from emission lines, including strong H-alpha emission. The primary star is surrounded by a protoplanetary disk, although it is not very massive, being less than 4 MJ. The secondary star also has a protoplanetary disk, and it is much more massive, equal to 10−1.07+0.49−0.87 M☉. The disk is inclined to the equatorial plane of the star.

References

Illustrations

Worked examples

Example 1 — a first encounter with ROXs 12

Start with the simplest possible case. Write down what ROXs 12 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 ROXs 12 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 ROXs 12 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 ROXs 12

In research: ROXs 12 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 ROXs 12 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: ROXs 12 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Binary stars, Circumstellar disks, M-type pre-main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for ROXs 12 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 ROXs 12 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what ROXs 12 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 ROXs 12 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is ROXs 12 in simple terms?

ROXs 12 is a member of a binary system of pre-main-sequence stars. It belongs to the Rho Ophiuchi cloud complex.

Why does ROXs 12 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 ROXs 12?

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 ROXs 12.