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Chapter 12: Problem 33

Define proplyds and elepbant trunks as they relate to star formation and the ISM.

Short Answer

Expert verified
Proplyds and elephant trunks are structures formed during star formation in the ISM. Proplyds are dense disks around new stars, while elephant trunks are elongated gas regions in nebulae.

Step by step solution

01

Introduction to Star Formation in ISM

The interstellar medium (ISM) is made up of gas and dust and serves as the birthplace for stars. Within the ISM, various phenomena and structures, like proplyds and elephant trunks, occur due to star formation processes.
02

Defining Proplyds

Protoplanetary disks, or proplyds, are regions of dense gas and dust surrounding newly formed stars. They are sites where planets may form and are usually found in star-forming regions like the Orion Nebula. Proplyds are illuminated by nearby stars, making them visible in space telescopes.
03

Defining Elephant Trunks

Elephant trunks are elongated, dense regions of interstellar gas and dust extending outward from nebulae. They are areas where star formation can occur, protected from harsh radiation by their larger environments. These structures are named for their trunk-like appearance.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Interstellar Medium (ISM)
The interstellar medium, often abbreviated as ISM, is an exciting and crucial part of the galaxy's ecosystem. Think of it as the cosmic cradle where stars are born. It is a vast collection of gas, dust, and cosmic particles that fill the space between stars within galaxies. This diffuse mixture acts as both a fuel and a nurturing environment for star formation.

Here's what you need to know:
  • The ISM is primarily composed of hydrogen, with minor amounts of helium and traces of heavier elements.
  • It houses a range of temperatures and densities, providing diverse environments where different star formation processes can kick-off.
  • Regions within the ISM can collapse under gravity to begin forming new stars, eventually creating a protoplanetary disk around these nascent stars.
Without the ISM, our universe would be a much more boring place. It is a dynamic and active part of space that is crucial in the life cycle of stars.
Protoplanetary Disks (Proplyds)
Protoplanetary disks, often referred to as proplyds, are the fascinating birthplaces of planets. Imagine a swirling disk of gas and dust orbiting a young star. That's a protoplanetary disk. They play a critical role in the formation of planetary systems, much like our solar system billions of years ago.

Key features of proplyds include:
  • These disks primarily consist of hydrogen gas and tiny dust particles.
  • As the young star in the center heats up, it influences the disk's material, causing it to clump together, creating larger bodies.
  • Through processes like accretion and collision, these clumps can grow into planets, moons, asteroids, and other celestial bodies.
  • Located in stellar nurseries, such as the Orion Nebula, proplyds are often lit up by nearby stars, giving astronomers a glimpse into the planet formation process.
Understanding proplyds is like peering into our own past as a solar system. How these disks evolve helps us piece together the story of how planets like Earth came to be.
Elephant Trunks
Elephant trunks are among the most visually striking features found in nebulae. Picture a gigantic, dense structure of gas and dust that resembles the trunk of an elephant, extending from a luminous cloud of gas. These formations are remarkable both for their beauty and their role in star formation.

What makes elephant trunks special?
  • They provide a shielded environment where star-forming activities can proceed, away from the intense radiation and stellar winds typical of nebulae.
  • These structures can harbor multiple newly forming stars and their associated protoplanetary disks.
  • While they might be tens of light-years long, they maintain their dense composition, allowing for gravitational collapse and eventual star birth.
Named for their distinct shapes, elephant trunks give us insights into the complex processes that occur in star-forming regions and the role of interstellar dust and gas in these feats of cosmic creation.

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Most popular questions from this chapter

How do molecular clouds provide protection from ultraviolet photons that can dissociate molecules? a. Their thermal energy deflects the ultraviolet photons. b. Their temperature is too low for the photons to be effective. c. Water within the cloud absorbs the photons. d. Their turbulence keeps molecules in rapid motion. e. The dense gas and dust in their interiors shield molecules from interstellar ultraviolet radiation.

Which phase of the ISM is found near hot, young stars? a. H I region b. H II region c. molecular cloud d. WISM e. coronal gas

Which of the following is/are not a source of turbulence in the ISM? a. rotation of the galaxy b. supernova explosions c. ultraviolet radiation from young stars d. jets from young stars e. infrared radiation from young stars

How do live, massive stars affect nearby stars and clouds? What about dying massive stars?

What is the birth line on the HR diagram, and where is it?
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