AST1120 Spectroscopy Lab Observation Sheet (8)

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Red Rocks Community College *

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1120

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Astronomy

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Oct 30, 2023

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AST1120 Spectroscopy Lab Observation Sheet The below are stellar spectra that you have observed. For each star on your lab report, provide the following information: 1. The star number. 2. Identify the stellar class (O, B, A, F, G, K, M). Consider the overall shape and the spectral lines present. If it appears to be between two types, note this too and note which one it is most like. IMPORTANT: write a couple of sentences about how you decided on the spectra type. 3. Note at least 3 of chemical lines that you see, and at what wavelength you see them at. (Try to use a straight edge, such as a ruler, to determine the wavelength of the spectral lines you are focusing on.) 4. From Table 2 of spectral types and temperatures, roughly estimate the temperature of each star. Star 1. For Star 1 the stellar class is A the 3 of chemical lines that I see in this star are Hydrogen: 6550 4900 4400 Calcium: 3900, 4000 Helium: 4190, Star 1 exhibits prominent but not absolute hydrogen and calcium spectral lines. It falls between Type A and Type F stars in terms of

characteristics, leaning more towards Type F. When it comes to this luminosity compared to A6 and F6 stars, the similarities between both Type 1 stars are striking well. Here we observed the temperature of each star from 6000 Kelvin to 7500 Kelvin. Star 2. For star number 2 The stellar class is K The spectral classification of this star was determined based on the characteristics observed in its spectrum. The 3 of chemical lines that I see in this star are Very weak hydrogen bonds, strong ionized calcium bonds (Ca II at 4000), strong sodium bonds (at Na 5900), and many nonmetallic bonds, especially Ca I at 4250. They are classified as K-type stars of spectral type A K2. Specific line intensities and wavelengths in the spectrum provide valuable insights into a star’s temperature, composition, and atmosphere, which in combination help classify its spectrum.

Star 3. For star 3 The stellar class is B The spectral classification of this star was determined by analysis of its spectrum as a B-type star of B3 spectral type. The 3 of chemical lines that I see in this star are The presence of neutral helium lines and solid hydrogen lines, especially in the range of 4100, 4400, 4900, and 6600 angstroms, played an important role in this classification Furthermore, higher temperatures by heating The 20,000 Kelvin mean corresponds to the characteristics usually associated with B -type stars Both spectral features and temperature observations together determine the spectral type of the star and provide insight into its basic properties.

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Star 4. For Star 4 The Steller class is G The spectral classification of this star as a G-type star with a spectral type of G4 was determined through a careful analysis of its spectrum. The 3 of chemical lines that I see in this star are as weaker hydrogen lines, strong ionized calcium lines, strong sodium lines (Na at 5900), and the presence of numerous lines of both ionized and neutral metals contributed to this classification. Additionally, the observed temperature of approximately 5700 Kelvin aligns with the characteristics commonly associated with G-type stars, further supporting this spectral classification. These spectral attributes collectively inform the star's spectral type and provide valuable insights into its physical properties .

Star 5. For star 5 The stellar class is O The data show the stellar structure of ionized helium lines and weak hydrogen lines. This spectral pattern seems to indicate a brighter, larger star. Especially 4400 and 4,400 and 4,400 and 4,400, the ion bands in the ion bands are characterized by early o and B. shaknuvanti, yena Hydrogen bands are weak compared to cool stars . Surface temperature is estimated at 40,000 K. Sources used

Spectra - Introduction . (n.d.). https://imagine.gsfc.nasa.gov/science/toolbox/spectra1.html

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