astronomy

VZ Piscium

VZ Piscium 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 VZ Piscium rather than just read about it. In short: VZ Piscium is a triple star system in the equatorial constellation of Pisces. it is located at a distance of 178 light years (54.5 parsecs) from the Sun based on parallax measurements, and has an apparent visual magnitude of about 10.3. This is an eclipsing binary system that undergoes shallow eclipses; the brightness decreases to magnitude 10.45 during the primary eclipse, then to magnitude 10.43 with the secondary…

Key takeaways

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

Reference excerpt

VZ Piscium is a triple star system in the equatorial constellation of Pisces. it is located at a distance of 178 light years (54.5 parsecs) from the Sun based on parallax measurements, and has an apparent visual magnitude of about 10.3. This is an eclipsing binary system that undergoes shallow eclipses; the brightness decreases to magnitude 10.45 during the primary eclipse, then to magnitude 10.43 with the secondary eclipse, although as a contact binary the brightness varies continuously with no period of constant maximum brightness. The system is drifting closer with a radial velocity of approximately −4 km/s, and has a net heliocentric velocity of 144.1 km/s. S. C. Wolff and associates examined the spectrum of this star in 1965 and found very weak H and K lines with an emission component. Some of the lines are doubled, which suggested this is a contact binary. It was confirmed as a W Ursae Majoris (W UMa) variable using photometric observations made by J. Moorhead. O. J. Eggen in 1967 found a period of just 6.26 hours and a high tangential space velocity of at least 100 km/s. Most of the variability of the system was found to be ellipsoidal and a small O'Connell effect was detected. The combined stellar class of the system matches a K-type main-sequence star with a type of about K3. A mass ratio close to one indicates the two stars have similar mass. Due to physical contact, most W UMa-type variables show eclipse minima of almost equal depth, but that is not the case for VZ Psc. The H and K line emission for this system suggests surface magnetic activity, and thus star spots. These darker features may explain the varying light curve of the system. A variation in the orbital period of the system has been observed over a time frame of 25 years, which may be explained by a magnetic activity cycle of the lower mass component. There is a temperature difference of about 900 K between the two components, which remains unexplained as direct contact would tend to even out the temperature. Both stars are highly distorted by the gravity of the other star. The more massive star is a third larger in the direction of the companion than pole-to-pole, and the less massive star is even more distorted. The outer (tertiary) companion, named HIP 115819 B, was detected as a member of this system in 2014 using data from the Pan-STARRS. It is located at a projected separation of 1,825+180−390 AU from the inner pair. It is a very low-mass star with 7.9–8.5% the mass of the Sun and a spectral type M9. This star has a cool effective temperature of 2,468±50 K and 1.06 times the radius of Jupiter (~0.11 times the radius of the Sun).

References

Illustrations

Worked examples

Example 1 — a first encounter with VZ Piscium

Start with the simplest possible case. Write down what VZ Piscium 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 VZ Piscium 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 VZ Piscium 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 VZ Piscium

In research: VZ Piscium 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 VZ Piscium 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: VZ Piscium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Durchmusterung objects, Hipparcos objects, K-type main-sequence stars, so understanding it makes those chapters shorter.
In everyday life: Look for VZ Piscium 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 VZ Piscium in 20 minutes

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

Frequently asked questions

What is VZ Piscium in simple terms?

Why does VZ Piscium 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 VZ Piscium?

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 VZ Piscium.