astronomy

LSR J1835+3259

LSR J1835+3259 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 LSR J1835+3259 rather than just read about it. In short: LSR J1835+3259 is a nearby ultracool dwarf of spectral class M8.5, located in constellation Lyra, the discovery of which was published in 2003. Previously it was concluded that this star is a young brown dwarf, but no lithium absorption lines are detected for this object, which is a strong indicator for young brown dwarfs that need 10–100 million years to deplete lithium.

Key takeaways

LSR J1835+3259 belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect LSR J1835+3259 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of LSR J1835+3259 from memory before moving on to harder problems.

Reference excerpt

LSR J1835+3259 is a nearby ultracool dwarf of spectral class M8.5, located in constellation Lyra, the discovery of which was published in 2003. Previously it was concluded that this star is a young brown dwarf, but no lithium absorption lines are detected for this object, which is a strong indicator for young brown dwarfs that need 10–100 million years to deplete lithium.

Distance Trigonometric parallax of this object, measured in 2001–2002 with the USNO 61 inch (1.5 m) reflector under US Naval Observatory (USNO) parallax program, is 0.1765 ± 0.0005 arcsec, corresponding to a distance of 5.67 ± 0.02 pc, or 18.48 ± 0.05 ly.

Characteristics

The first potential extrasolar auroras detected occurred in the atmosphere of LSR J1835+3259. They were found in July 2015 by the Karl G. Jansky Very Large Array in New Mexico by analyzing the emitted radio waves. The potential auroras were probably 1 million times brighter than those ever observed on Earth. The optical emission is mainly red in colour, because the charged particles are interacting with hydrogen in its atmosphere. It is not known what the cause is. Some have speculated that material may be being stripped off the surface of the brown dwarf via stellar winds to produce its own electrons. Another possible explanation is an as-yet-undetected planet or moon around the dwarf, which is throwing off material to light it up, as is the case with Jupiter and its moon Io. High resolution imaging using the High Sensitivity Array resolved the quiescent radio emission into two radio lobes, showing that it has a similar structure as Jupiter radiation belts. The radiation belt is seen in three epochs, spanning more than one year. The two lobes are separated by up to 18 ultracool dwarf radii and the right-circularly polarized aurora appears right in the middle of the two lobes.

References

Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs". The Astrophysical Journal. 784 (2): 156. arXiv:1312.3241. Bibcode:2014ApJ...784..156D. doi:10.1088/0004-637X/784/2/156. S2CID 18789867. Table with parallaxes.

External links The 100 Nearest Star Systems (RECONS)

Illustrations

Worked examples

Example 1 — a first encounter with LSR J1835+3259

Start with the simplest possible case. Write down what LSR J1835+3259 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 LSR J1835+3259 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 LSR J1835+3259 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 LSR J1835+3259

In research: LSR J1835+3259 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 LSR J1835+3259 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: LSR J1835+3259 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lyra, M-type main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for LSR J1835+3259 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 LSR J1835+3259 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what LSR J1835+3259 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 LSR J1835+3259 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is LSR J1835+3259 in simple terms?

Why does LSR J1835+3259 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 LSR J1835+3259?

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 LSR J1835+3259.