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Harsha Avinash Tanti
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Hi, I would like to raise a question about Role of magnetic field while formation of small to medium scale stars emerging from nebula ?
Welcome to the PF.Harsha Avinash Tanti said:Hi, I would like to raise a question about Role of magnetic field while formation of small to medium scale stars emerging from nebula ?
Harsha Avinash Tanti said:Hi, I would like to raise a question about Role of magnetic field while formation of small to medium scale stars emerging from nebula ?
berkeman said:Can you post links to the reading you have been doing so far?
JMz said:Please clarify: Are you asking if magnetic fields influence the formation of medium- & low-mass stars? Or if the fields influence their emergence from the proto-stellar nebula (Herbig-Haro stage, for instance)?
I see your hypotheses seems fair enough but I have another one as we have known the existence of magnetic properties of elements from last few decades, I think that its the electromagnetic forces that brings together few of the particle together in a nebula after which the gravitational contraction begins as gravity plays its role due to which the cluster of particle gets a spin as other particle hits it and joins it due to this constant bombardment heat is produced which some how creates a magnetic field and according to me the magnetic helps the form of star as this " It stops the charged particles (possibly electron clouds), due to which stable atoms gets attracted and the heat due to bombardment and rotation kicks off fusion".JMz said:In most situations, magnetic fields "come along for the ride", especially during the collapse of a gas cloud into a proto-star. In particular, if the molecular cloud collapses to form any stars at all, then my understanding is that gravity is typically a much bigger effect than magnetic fields, except perhaps very locally. (E.g., the immediate vicinity of a pulsar would not be a likely place for a proto-star to form. However, the magnetic field isn't the only reason for that.)
I have seen hypotheses that magnetic fields are important for clearing the proto-stellar nebula (and shutting down planet formation), though I don't know the current state of research on that. There are multiple mechanisms to form jets near the proto-star, not only magnetic fields. However, the fields do seem to be important for HH objects, which are themselves a normal part of low-mass star formation: see https://en.wikipedia.org/wiki/Herbig–Haro_object.
please provide links to reputable papers on thisHarsha Avinash Tanti said:I see your hypotheses seems fair enough but I have another one as we have known the existence of magnetic properties of elements from last few decades, I think that its the electromagnetic forces that brings together few of the particle together in a nebula after which the gravitational contraction begins as gravity plays its role due to which the cluster of particle gets a spin as other particle hits it and joins it due to this constant bombardment heat is produced which some how creates a magnetic field and according to me the magnetic helps the form of star as this " It stops the charged particles (possibly electron clouds), due to which stable atoms gets attracted and the heat due to bombardment and rotation kicks off fusion".
davenn said:please provide links to reputable papers on this
personal theories are against PF rules
Two things to keep in mind: (1) For practical purposes, the nature of the atoms does not matter -- for instance, iron and hydrogen are about equally irrelevant: Both nuclei are much more massive than electrons (though iron may ionized more easily, producing free electrons). Magnetic fields in gases and plasmas are caused by macroscopic electrical currents, mostly free electrons.Harsha Avinash Tanti said:I see your hypotheses seems fair enough but I have another one as we have known the existence of magnetic properties of elements from last few decades, I think that its the electromagnetic forces that brings together few of the particle together in a nebula after which the gravitational contraction begins as gravity plays its role due to which the cluster of particle gets a spin as other particle hits it and joins it due to this constant bombardment heat is produced which some how creates a magnetic field and according to me the magnetic helps the form of star as this " It stops the charged particles (possibly electron clouds), due to which stable atoms gets attracted and the heat due to bombardment and rotation kicks off fusion".
My thought seems childish but its got its own merit as by my hypotheses one can explain the accumulated electron clouds near medium and low mass star.
In terms of my last response, note that (a) this abstract deals with magnetic fields in proto-stars that have already formed, not fields in gas clouds, and (b) stars and proto-stars are plasmas.Harsha Avinash Tanti said:Sorry! I don't know the rules well here as I am new.
I currently studying the outflow by the proto stars in star formation process, I don't have any proofs regarding my theory. But here are some papers which lead me to this thought and a Phd topic proposed by ESO by Dr. Markus Schöller which is "Spectropolarimetric observations of Herbig Ae/Be stars indicate that magnetic fields are important ingredients of intermediate mass star formation. To properly understand the physics involved in the intermediate mass star formation process, it is particularly important to know the origin of the magnetic fields in these stars. However, current theories are not able to present a consistent scenario of how the magnetic fields in Herbig Ae/Be stars are generated or how these fields interact with the circumstellar environment, presenting a combination of disk, wind, accretion, and jets. Understanding the interaction between the central stars, their magnetic fields, and protoplanetary disks is crucial to reconstruct the Solar System's history, and to account for the diversity of exoplanetary systems." .
https://arxiv.org/pdf/1603.08385.pdf
https://link.springer.com/chapter/10.1007/978-1-4020-6935-2_31
Sir, Will you be able to refer me some articles regarding this.alantheastronomer said:There's a problem in the theory of protostellar collapse, and that is that angular momentum precludes the collapse from proceeding. Efforts have been made to solve this problem by means of what's called "ambipolar diffusion" - the decoupling of molecular hydrogen from the plasma that it's collisionally coupled to - and a concept called "flux freezing" - where the magnetic field of the protostar is "frozen" in the surrounding disk. The orbital velocity of the disk being smaller than the rotational velocity of the protostar, the disk slows down the protostar by way of the frozen magnetic field, the disk gaining angular momentum as the star loses it.
The magnetic field plays a crucial role in the formation of small to medium scale stars. It helps to regulate the flow of gas and dust in the protostellar disk, allowing material to accrete onto the star and preventing it from being blown away by stellar winds. It also plays a role in the formation and shaping of bipolar outflows, which can have a significant impact on the star's evolution.
The magnetic field can greatly influence the accretion process in star formation. It can channel material onto the protostar's surface, increasing the rate of accretion. It can also create turbulence in the protostellar disk, which can aid in the redistribution of angular momentum and prevent the formation of large, unstable disks.
Yes, the magnetic field can have a significant impact on the final mass and structure of a star. It can affect the rate and direction of accretion, which can determine the amount of material that ends up in the star. It can also influence the star's rotation and magnetic field alignment, which can affect its internal structure and evolution.
Scientists study the role of magnetic fields in star formation through a combination of theoretical modeling and observational data. They use computer simulations to understand how magnetic fields affect the formation and evolution of stars. They also use telescopes and other instruments to observe and measure the magnetic fields in protostellar disks and young stars.
Understanding the role of magnetic fields in star formation can have significant implications for our understanding of how stars and planetary systems form. It can also help us predict and explain the properties and behavior of stars at different stages of their evolution. Additionally, it can provide insights into the formation of other astrophysical objects, such as black holes and galaxies.