spectral classification of stars lab answers

Classification of Stellar Spectra. Spectral Classification of Stars 43 The advent of the spectroscope in the 1800's allowed astronomers to study the temperatures and compositions of stars, and to classify stars according to their spectral similarities. We provide nearly 200 spectra for use in this lab, including spectral standards for several luminosity classes as well as the main sequence. You will use spectra to find the peak wavelength, color, and temperature of real stars. INSIDE LAB 7: Plotting Stars on the Hertzsprung ... (H-R diagram) is a plot of the luminosity of a star versus its spectral classification. Don't post Outcomes results to Learning Mastery Gradebook. Lab 06 CLEA The Classification of Stellar Spectra Purpose The purpose of this lab is to learn how to classify the spectra of main sequence stars. The spectra of the standard stars are now available for plotting on the top and bottom graphs. Star - Star - Classification of spectral types: Most stars are grouped into a small number of spectral types. Geologists have an elaborate system of classification for rocks and minerals. Your answer for #2 is wrong, though. This project teaches students about spectral types of stars. One Å is 10-10 m while 1 nm is 10-9 m, so there are 10 Å in 1 nm. If you have not completed that exercise you must do so before proceeding with this one. Biologists classify plants and animals into subgroups called genus and species. Use the table below to report how many of each type of star you […] Type Reasons HD 124320 A3 HI 3970, 4102, And 4340 A Lines Similar In Strength To A1 And A5 Types. Then complete the following questions related to the background information. Use this rubric for assignment grading. In this lab you will use standard spectra to develop a classification scheme for spectra; then compare it to the established classification pattern developed by astronomers. When seen through a spectroscope, stars reveal their "personality" in beautiful, vivid colors! Look at the energy level diagram below. The writeup for this lab is Laboratory Exercises in Astronomy--Spectral Classification, by Owen Gingerich of the Harvard-Smithsonian Center for Astrophysics. The stars used in todayʼs lab are all main sequence (sub-type V) stars and their grouping should be evident though plotting. Note that in this lab wavelengths are given in units of Ångstroms (Å) rather than nanometers (nm). If that is the case, you will need to estimate the sub-type. Not all of the star types are shown, such as the Red Supergiant stars.Morgan-Keenan spectral classification by LucasVB is licensed under CC BY-SA 3.0 In this exercise we will obtain a spectral classification of some of the stars which were studied in the Photoelectric Photometry observation, scheduled earlier. An Introduction to the Large Scale. For each star, also write down their u, g, and r, magnitudes and (g-r) colors. Keenan at Yerkes Observatory to take account of the Students will learn that the spectral classification system is actually a temperature scale for stars. (c) The Sun has a spectral classification of G2. Work through the background sections on Spectral Classification, Luminosity, and the Hertzsprung-Russell Diagram. Thus a B5 star is cooler than a B0 star but hotter than a B9 star. The open circles on the figure represent electrons. 20. The behaviour of most stars approximates that of black body radiators. Summary: In this lab you will use a visual spectroscope to observe the spectra of several bright stars, identify spectral features, and determine their spectral classes. Thus, the mass, temperature and luminosity of a star are fundamentally related. 1 Ångstrom = 10-10 meters; 1nm = 10 Ångstroms. Astronomers use the patterns of lines observed in stellar spectra to sort stars into a spectral class. The spectral classification system used today is a refinement called the MK system, introduced in the 1940’s and 1950’s by W. W. Morgan and P.C. On the page labelled Data Table: Practice Spectral Classification, you must give a type and reasons for the following stars: HD 37767 HZ 948 Feige 41 HD 6111 HD 242936 HD 5351 HD 27685 HD 21619 SAO 81292 (watch out, this one has some emission lines) The behavior of absorption lines and the continuum radiation is also examined. The student examines and classifies the spectra of 10 stars. Spectral classification examines only the light emitted by the relatively thin external layer or photosphere of a star. SPECTRAL CLASSIFICATION. At first, 26 classes were defined; one for each letter in the alphabet. 1. The Henry Draper Catalogue and the Bright Star Catalogue list spectral types from the hottest to the coolest stars (see stellar classification). Astronomy 101. After your group has accurately classified 40 stars, turn in your printouts from the SCOPE website and answer these questions as a group. Star spectra have absorption features from their surface atoms that cause them to differ with pure blackbody spectra.) Question 1: The table below summarizes the relationship between spectral type, temperature, and color for stars. There are seven standard spectral classes. SKU LE002A Stars rotate, causing their spectra to broaden. Keenan at Yerkes Observatory to take account of the fact that stars at the same Spectral Classification of Stars 5 Background and Theory Classification lies at the foundation of nearly every science. Do the same for the brightest stars. Thus a B5 star is cooler than a B0 star but hotter than a B9 star. Knowledge of spectral classification is fundamental to understanding how astronomers put together a description of the nature of stars and a theory of their evolution. Spectral Classification of Stars Introduction Classification lies at the foundation of nearly every science. 21. Start studying Lab: The Classification of Stars. You will also build a Hertzsprung-Russell Diagram. Background: The History and Nature of Spectral Classification Patterns of absorption lines were first observed in the spectrum of the sun by the German physicist Joseph Turn this sheet in with your star classifications. Stars emission curve peaks at the same wavelength that a blackbody emission curve does, if the star and the blackbody are the same temperature. Historically the H-R diagram was a very important key in unraveling the ... radius, luminosity etc. But only 7 … This lab teaches the basic techniques and criteria of the Morgan-Keenan system of spectral classification. Repeat: Classify all of the stars for which you have collected spectral data. Fill in answers to all the questions. Write all answers in the space below each question. L, M and T = stars are=20 all cooler than K stars, with M stars being the hottest of the three and = T stars=20 the coolest. Scientists develop classification systems based on patterns and relationships. Because a star’s temperature determines which absorption lines are present in its spectrum, these spectral classes are a measure of its surface temperature. Question: Data Table: Spectral Classification Star Sp. The electron transitions Use the Mass, Luminosity Relationship from section 2.1 to complete the “Luminosity” column in Table 2 and plot the stars from this lab to reveal the pattern. 1/2/2012 Spectral Classification of Stars ae 23 Application Exercise: Spectral Classification of Stars Objectives To learn the basic techniques and criteria of the spectral classification sequence by: • examining and classifying spectra according to the strength of the hydrogen Balmer absorption lines ruled out that the star is some sort of giant star then the star is a main-sequence star (luminosity class V) but a spectral sub-class not part of the example standards given. Lab Day and Time Lab Preparation - Spectral Classification of the Stars Before the first lab session: Read entirely the lab manual Spectral Classification of the Stars. These types are designated, in order of decreasing temperature, by the letters O, B, A, F, G, K, and M. Remove points from rubric. Classification of Stellar Spectra Introduction In this activity you will learn about spectral types of stars. They will also learn what causes the absorption and emission lines in a star's spectrum, and why stars of different temperatures have different spectral … Spectral Classification of Stars. Ca II 3934 Å Line Strength Midway Between Those Of A1 And A5 Types. After your group has accurately classified 40 stars, turn in your printouts from the SCOPE website and answer these questions as a group. 1. The sprectra of highlighted standard star on the list and the one below it are … Use this list of stars as reference stars to classify the spectral type of the 14 listed stars listed on the answer sheet below. Bates College. Spectral Classification of Stars / -- I'll write free-form comments when assessing students. Rewrite the classification sequence you found in Table 4 to = include=20 L, M and T stars… Keenan at Yerkes Observatory to take account of the fact that stars at the same temperature can have different sizes. This means that they emit some energy at each wavelength but also have a peak wavelength and region in which they emit most of their energy. Maybe with some imagination, classification to spectral subtypes 1--3 and 6--9 is possible. Go through the attached portions of the CLEA exercise. The NAAP HR Diagram Lab explores the Hertzsprung-Russell diagram and those areas necessary to understand the diagram such as (but not limited to) the different kinds of spectrum, spectral classification, and luminosity class. This … spectral types followed the same pattern. (Stars also "shine" through neutrino emittance and mass loss or "evaporation" at the surface, but these do not affect the spectral type.) o ANSWER QUESTION 17 FOR A SECOND STAR Close VIREO Spectrometer window, close VIREO Telescope Control Panel Under “Tools”, click “Spectral Classification” Under “File”, click “Unknown Spectra”, then select “Saved Spectra (*.SSP)…” o Open your saved spectra, find the spectral type as above. Spectral Classification of Stars Instructions:Use this worksheet instead of the exercise 20.2 from the lab manual. In the early 1890s Wilhelm Wien investigated thermodynamics and coined the term black body for an ideal radiator. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Thus a B5 star is cooler than a B0 star but hotter than a B9 star. An astronomer, Annie Jump Cannon, sorted spectral data and designed the stellar spectral types we still use; O-B-A-F-G-K-M. Stars – colors with spectral types. Turn this sheet in with your star classifications. Objectives After completing this activity students will be able to: The spectral classification system used today is a refinement called the MK system, introduced in the 1940’s and 1950’s by W. W. Morgan and P.C. Spectral Classification of Stars Instructions:Use this worksheet instead of the exercise 20.2 from the lab manual. Spectral Classification-- Procedure and Worksheet Note: In this lab all wavelengths are given in units of Ångstroms. The spectral classification system used today is a refinement called the MK system, introduced in the 1940’s and 1950’s by W. W. Morgan and P.C. In addition to the 6 spectral types studied in = this lab=20 (A,B,F,G,K,O,) stars classified as L, M and T also exist. This 6- by 9-inch answer sheet gives the spectral classifications of the 30 stars whose spectra are shown in Laboratory Exercises for Astronomy - Spectral Classification. Don't use plagiarized sources. 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