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Concepts of Astrophysics I

by: Maria Deckow

Concepts of Astrophysics I ASTR 421

Marketplace > University of New Mexico > Astronomy > ASTR 421 > Concepts of Astrophysics I
Maria Deckow
GPA 3.9

Ylva Pihlstrom

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Ylva Pihlstrom
Class Notes
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This 1 page Class Notes was uploaded by Maria Deckow on Wednesday September 23, 2015. The Class Notes belongs to ASTR 421 at University of New Mexico taught by Ylva Pihlstrom in Fall. Since its upload, it has received 22 views. For similar materials see /class/212216/astr-421-university-of-new-mexico in Astronomy at University of New Mexico.


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Date Created: 09/23/15
Outline Term Paper Project Astro 421 91608 Title A review of the ProtoPlanetary Nebulae Outline 1 I 9 P 01 Introduction Here I will introduce the concept of a ProtoPlanetary Nebulae PPNe explaining in what stage of evolution the star is and what type of stars we expect to become Planetary Nebulae I will also discuss why we want to study PPNe for example they manifest a very brief period in the evolution of solar mass stars In particular during this period the mass loss switches from a spherical geometry into a bipolar one This transition phase is not very well understood but is important for understanding the late stages of a stellar life and to understand the formation of many PNe observed today Previous workobservations In this section I will present what we have learnt about PPNe so far There are observations both in the optical and in the radio of these sources and I will give an example of how these types of observations have made us understand the basics of what they are Ifl can find a diagram andor an image eg HST this will be included to illustrate the source geometry and characteristics The subgroup of water fountain PPNe Here I will concentrate my discussion to a specific subgroup of the PPNe the water fountain sources see references by Boboltz Marvel Claussen etc I will point out that these sources carry masers which can be used to trace dynamics in these sources In turn the dynamics will give information about source age and so on A figure will be included where I show how masers at the endpoint ofjets can be used to estimate the jet propagation speed New or future science I will discuss the questions that still remains to be solved and what challenges researchers in this area face For instance the distances to these objects are poorly constrained which makes it hard to estimate true luminosities masses massloss rates and so on However this could be solved using parallax measurements determining trigonometric distances I will explain how this works Summa This will be a brief section just summarize the main points of the term paper what a PPNe is why we study them and what the future prospects are of studying these objects distance measurements will revolutionize the understanding of PPNe and this will be possible within the next 5 years


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