What stars are called new? Detailed answer

BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Free library / Directory / Big encyclopedia for children and adults

What stars are called new? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

Did you know?

What stars are called new?

Each year, 25-30 (by some estimates, even more than 200) new stars flare up in the Galaxy, although only a few of them are observed. The novae are characterized by an extremely rapid increase in brightness by thousands and even millions of times (by an average of 12 magnitudes, that is, 60 thousand times) over several days and a subsequent slow return to the initial state over several months or years (first, the brightness of the star faster and then it slows down).

A nova is a binary star, one component of which is a white dwarf and the other is either a star like the Sun or a red giant. The period of revolution of the components of this binary star is only a few hours, and therefore, the distance between them is quite small and the interaction forces are quite large.

When the second component of such a binary star expands in the course of its evolution, passing a certain boundary (the so-called Roche limit), part of its matter flows into the white dwarf. At the same time, such temperature and pressure are created on the surface of the white dwarf that the nuclear reaction becomes explosive, which explains the sharp increase in the brightness of the star.

Expanded (bloated) hundreds of thousands of times, the star separates at the moment of maximum brightness a gaseous shell, equal in mass to 0,00001-0,0001 of the mass of the Sun. That, gradually expanding, dissipates in space. The expansion rate of nova shells is about 1000 kilometers per second.

A distinctive feature of many new stars is the recurrence of their outbursts. The intervals between outbursts in repeated novae range from several tens to several thousand years (they are longer for those repeated novae that increase brightness more strongly).

Outwardly, the new ones are similar to supernovae, although in general we are talking about completely different phenomena and the energy released during the explosion is less than a million times.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What are elements?

All matter is made up of elements. Elements are substances made up of atoms of only one kind. Many elements have similarities with each other, sometimes even very significant, but among them no two are absolutely identical. For example, hydrogen and helium are both colorless, odorless, and tasteless gases. However, hydrogen is lighter than helium. It burns in the presence of oxygen, but helium does not.

Elements differ from each other by atomic weight. Some of them under normal conditions are solids, others are liquids, and still others are gases. When heated or cooled, many of them (almost all) can go from one state to another. Some elements dissolve in water, others do not. These and many other characteristics of elements are called their physical properties. Elements can interact with each other (with a few exceptions), forming various substances. Such interactions are called chemical reactions. The ability of an element to enter into a particular reaction is determined by its chemical properties.

In accordance with their physical and chemical properties, all elements are divided into several groups. They include elements with similar properties. These groups together make up the periodic table of elements of D. I. Mendeleev. It is named after the Russian chemist Dmitri Ivanovich Mendeleev, who came up with the idea of creating this table.

The order of arrangement of elements in the table of D. I. Mendeleev is determined by their serial atomic number. The serial number of an element depends on the number of protons - positively charged particles - in the nucleus of an atom of a given element. The hydrogen atom contains only one proton and therefore occupies the first place in the periodic table. Some elements were named after great scientists, such as einsteinium (Einstein). Others are in honor of countries or certain areas on the globe: germanium (Germany), ruthenium (Russia), california (California), scandium (Scandinavia). Still others are named for their special properties: indium (because of its bright indigo blue color). Many elements are well known to everyone: copper, iron, lead, silver, gold, aluminum, sulfur, mercury, iodine and many others.

Test your knowledge! Did you know...

▪ Who Invented Electricity?

▪ Who Invented Road Signs?

▪ What animals steal shiny things from people, and often leave something else in return?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Accelerometer ST Microelectronics LIS3DHH 26.07.2017

The new accelerometer LIS3DHH was created specifically for use in inclinometers - devices for accurately measuring the angles of an object. To ensure exceptionally high accuracy performance, the LIS3DHH has only one measuring range of ±2.5 g. The relatively large 5mm x 5mm ceramic case serves the same purpose.

The new chip features a low noise level of 45 ?g/vHz and excellent temperature and time stability (<0.4 mg/°C). It is suitable for use in test equipment, for stabilizing antenna platforms and in measuring instruments.

The zero shift for LIS3DHH does not exceed ±60 mg. The microcircuit has an uncalibrated temperature sensor with a resolution of 16 units / degree and a noise of 0.1 ° C (RMS). The operating voltage of LIS3DHH is 1,71 ... 3,6 V, and the current consumption is 2,5 mA.

Features LIS3DHH:

3-axis, ±2.5 g full scale
Ultra-low noise: 5µg/vHz
Excellent temperature stability: <0.4 mg/°C
Output data 16-bit
SPI 4-wire digital interface
Temperature sensor output 12 bit
Embedded FIFO (32 levels deep)
High overload resistance
Temperature -40 °C ... +85 °C

Other interesting news:

▪ Found a new property of graphene

▪ Phison PS5.0-E5026 PCIe 26 Drive

▪ Chemists against global warming

▪ Named the best time for lunch

▪ Paper against coronavirus

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Electrician in the house. Article selection

▪ article With a shield or on a shield. Popular expression

▪ article Who is an animal, and who is a beast? Detailed answer

▪ article Ways and means of detecting caches. Spy things

▪ article Battery charge regulator for solar cells. Encyclopedia of radio electronics and electrical engineering

▪ article Elusive ring. Focus Secret

Leave your comment on this article:

All languages of this page

Home page | Library | Articles | Website map | Site Reviews