Announcements Archive
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Course grades have been submitted. |
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Our last class meeting will be devoted to Exam 3. A Study Guide has been posted since last Friday, and we are having a Help Session Wed. afternoon. The usual procedures apply: bring your UT Photo ID and arrive before 9:45 AM. This exam focuses on interacting binary systems, black holes, and GRBs (gamma-ray bursts); it is not a comprehensive exam. It is also the last exam of the semester: there is no final during Finals Week. Course grades will be posted on or before Fri., Dec. 14. |
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Quiz 8 was given Thurs., Nov. 29. It will be graded and returned in class on Tues., Dec. 4. We will re-take the first-day Background Survey that day, providing another participation credit point for those who need it. |
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Scores and a feedback file for Exam 2.5 are now posted. We are just beginning to talk about black holes, and will continue after Thanksgiving. You should read ch. 9, 10, & 11 in Wheeler's book during the break. We have now had more than 20 points of participation credit through in-class activities. However, if you missed a couple of classes or cards, you can do Optional Homework 3, which is due at the start of class on Tues., Nov. 27. There will also be at least two more additional in-class activities, as well as Star Parties. |
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Scores for Exam 2 are now posted on Blackboard. All students, whether or not they missed Exam 1 or 2, are welcome to take the make-up exam we're calling Exam 2.5, on Thurs., Nov. 15. This will cover the material from both of the earlier exams, and can replace an earlier missed or low-scoring exam. See the Study Guides for topics, resources, and review questions. There will also be a Help Session on Wed., Nov. 14, as usual. |
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The Study Guide for Exam 2 is now posted (see Exams page). Relevant sections in the recommended books can be found on the Readings & Links page. The exam format will be similar to that of Exam 1, but on the material covered since Exam 1. Bring your UT photo ID to the exam; you will be asked to place it on the table in front of you during the exam. In order to receive credit for the exam, you must arrive no later than 9:45 AM, and no one will be allowed to leave until 9:50 AM at the earliest. |
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On Thursday, Oct. 30, we began talking about neutron stars and pulsars. There will be a quiz on Thurs., Nov. 1 on the topic of the aging and death of high-mass stars, as covered in the last two class meetings. Then we will launch into the subject of stars in interacting binary systems. The readings are mostly in Wheeler's Cosmic Catastrophes book at this point. |
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We are now well into the topic of the aging and death of single stars. We've discussed the evolutionary path of lower mass stars (up to 8 solar masses), and will have a quiz on this on Thurs., Oct. 25. Then we move on to higher-mass stars that die in supernova explosions. The Readings & Links page is being updated, and includes many sections in the assigned textbooks as well as some outside links. |
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We will have a Quiz on exoplanets on Thurs., Oct. 18. Graded exams and old quizzes were returned in class on Tuesday. If you did not pick your papers, you may obtain them during office hours or at the Wed. help session. If you have questions about credit you lost on the exam, first consult the feedback file on the Exams page. If you don't find the answer there (or don't understand it), then it is time to consult one of the T.A.s or instructor, or ask at the help session. |
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Exam 1 is being graded and will be reviewed on Thurs., Oct. 11. There will also be a quiz Thursday, on recent material. |
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Our first hour exam will be Thurs., Oct. 4. It will cover through the topic of HR diagrams of star clusters (topic III B on the Readings page). A Help Session will be held Wed., Oct. 3 at the usual time and place. The Study Guide for the exam is posted at the Exams link on this menu. If you haven't picked up your all of your graded Quizzes, you can get them during (any of) our office hours, or at the Help Session. |
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Our first hour exam will be Thurs., Oct. 4. It will cover through the topic of determining ages of star clusters from their HR diagrams, discussed on Thurs., Sep. 27. A Help Session will be held Wed., Oct. 3 at the usual time and place. The Study Guide for the exam is posted at the Exams link on this menu. |
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Quiz 3 on Thurs., Sep. 27, will be partly on spectra and partly on stellar properties. Some students are still confused about light and spectra, and it is important to understand this material in order to apply it to observing starlight. See the feedback files on the quizzes and cards, or go to a help session, for review. Also coming up is the first in-class Exam, on Thurs., Oct. 4. A Study Guide will be posted by Fri., Sep. 28. |
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We have now moved on to the topic of properties of stars in general, and how we are able to measure them. This will lead us into discussions of Main Sequence stars other than the Sun, the ranges of their possible properties, and objects too small to become real stars (which are called brown dwarfs). If you have Kaler's book, read through ch. 1 and most of ch. 2; otherwise, look for these topics in any introductory textbook. Some helpful links are, or will, posted on the Readings & Links page. |
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We will finish our review of the properties of light on Tues., Sep. 18, and there will be a Quiz on this topic on Thurs., Sep. 20. Then we will briefly review the forces and types of energy that play important roles in the lives of stars, before moving on to discussing stellar properties in general. See the Readings and Links page for suggested readings and some helpful websites on the topics we are discussing in class. |
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On Thurs., Sep. 6, we discussed the topic of solar neutrinos. There are only a few pages on this subject in our assigned books, namely pages 21 - 26 in Wheeler. For an excellent, more detailed synopsis of the "solar neutrino problem" see "Solving the Mystery of the Missing Neutrinos," a column written by the late John Bahcall, one of the pioneers of this subject. |
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We are continuing to talk about the Sun, now touching on its internal structure and how it produces energy. On Thursday we'll bring up the topic of solar neutrinos (see pages 21 - 26 in Wheeler). Class Slides and feedback on Thursday's Activity Card are posted on the corresponding pages (see menu). |
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At the first class meeting on Thurs., Aug. 30, students took a survey to assess their background knowledge in Astronomy, and were reminded that Ast 309N has a prerequisite of Ast 301 or the equivalent (a college-level, one-semester introductory astronomy course). We watched a video about solar storms and how they affect us on the Earth, serving as an introduction to discussing the properties of our Sun, the nearest star. |