sing the HR diagram provided in this module (download the JPG file), find the absolute magnitudes for seven Main Sequence stars of temperatures 25000 K, 10000 K, 8000 K, 6000 K, 5000 K, 4000 K, 3000 K.
As explained in the video, find the Kelvin temperature, for a given star, on the horizontal upper axis, then move down from that point to the Main Sequence, then move right to the vertical absolute magnitude axis and read off the absolute magnitude.
Make a table with two columns. Kelvin temperature on the left and absolute magnitude on the right. Seven stars.
You will use these temperatures and absolute magnitudes in the next project, to find the distances to stars of certain apparent magnitudes that I will assign. Apparent magnitude is a measure of the amount of a star’s light that enters the telescope. The absolute magnitude is a measure of the total power radiated by a star in all directions.
Category: Astronomy
Recall that a spectroscope spreads out light into its component colors, or WAVEL
Recall that a spectroscope spreads out light into its component colors, or WAVELENGTHS. A laser pointer emits light at just one wavelength. A light bulb emits a mix of countless wavelengths. A spectroscope spreads them out so you can see the colors, or wavelengths, separately.
Let the light from the source shine in through the vertical slit in the spectroscope. Concentrate on seeing the light come through the vertical slit first, then move your eyes to the left or right to see the colorful spectrum. It takes some practice to produce a nice rainbow, or spectrum. For example, the Sun delivers way more light than you need, but the Moon’s spectrum is tough to see because the Moon is much fainter than the Sun and only a narrow slit allows the light through. You will be able to see rainbows on the left and right, and even on top of the wavelength scale, depending on how you hold the spectroscope.
Sources with a small angular size in your field of view (like a pen light, candle flame, the Sun,) produce the best spectra. Big sources like a TV screen or your roof on fire will be difficult: There will be fat, overlapping spectra.
Try observing the Sun, an incandescent light bulb, an LED light, a fluorescent light, a candle flame, gas flame from stove or propane torch, streetlight, red light from electric stove coil. When you observe the Sun, do not put the slit directly on the Sun. It is too bright. Protect your eyes by putting the slit near the Sun, but not directly on it. Keep the Sun just out of the slit. You will still get plenty of light and a bright spectrum. Pay attention to the dark absorption lines you see against the Sun’s spectrum (rainbow). Draw them in on your diagram.
Draw me a picture of your observations of six light sources. Make it look like a long bar, with sections showing the different colors. One bar for each spectrum/light source observed. Use colored pencils. Label the parts of the spectrum indicating colors and brightnesses. Send me a photo or scan of your picture.
Make comments on what you’ve seen. You will need them for your report in the next project. For example, “I was surprised how little yellow light I saw in the spectrum of a candle flame. There definitely wasn’t much blue, but there was a lot of RED.”
I expect you to draw me at least SIX SPECTRA (rainbows). Be a careful observer and recorder. Don’t just make a kindergarten mess with your crayons. I know what these spectra are supposed to look like, so pay attention. This is easy points if you follow instructions the first time. Many of your predecessors did not and brought great pain upon themselves.
A large part of astronomy is making observations, even with the naked eye. To th
A large part of astronomy is making observations, even with the naked eye. To that end, you will be keeping an observation log throughout the term. To that end, you will be keeping an “observing log” where you will take weekly observations using online resources and hopefully the clear sky! You will be recording a log of the sky and making observations of what you see. Below I will attach a link with complete directions and the whole format and template you will be using. You will need to fill out week #4. It is from the perspective of someone living in Salem Oregon on the days between January 29-feb 4, 2024. I will also post a screenshot to show you how it should look.
https://docs.google.com/document/d/1vvEOG2cTk6YGpvQ_fObDjsllD9ZoZBUmPNclREi-ceE/edit
sing the HR diagram provided in this module (download the JPG file), find the ab
sing the HR diagram provided in this module (download the JPG file), find the absolute magnitudes for seven Main Sequence stars of temperatures 25000 K, 10000 K, 8000 K, 6000 K, 5000 K, 4000 K, 3000 K.
As explained in the video, find the Kelvin temperature, for a given star, on the horizontal upper axis, then move down from that point to the Main Sequence, then move right to the vertical absolute magnitude axis and read off the absolute magnitude.
Make a table with two columns. Kelvin temperature on the left and absolute magnitude on the right. Seven stars.
You will use these temperatures and absolute magnitudes in the next project, to find the distances to stars of certain apparent magnitudes that I will assign. Apparent magnitude is a measure of the amount of a star’s light that enters the telescope. The absolute magnitude is a measure of the total power radiated by a star in all directions.
Recall that a spectroscope spreads out light into its component colors, or WAVEL
Recall that a spectroscope spreads out light into its component colors, or WAVELENGTHS. A laser pointer emits light at just one wavelength. A light bulb emits a mix of countless wavelengths. A spectroscope spreads them out so you can see the colors, or wavelengths, separately.
Let the light from the source shine in through the vertical slit in the spectroscope. Concentrate on seeing the light come through the vertical slit first, then move your eyes to the left or right to see the colorful spectrum. It takes some practice to produce a nice rainbow, or spectrum. For example, the Sun delivers way more light than you need, but the Moon’s spectrum is tough to see because the Moon is much fainter than the Sun and only a narrow slit allows the light through. You will be able to see rainbows on the left and right, and even on top of the wavelength scale, depending on how you hold the spectroscope.
Sources with a small angular size in your field of view (like a pen light, candle flame, the Sun,) produce the best spectra. Big sources like a TV screen or your roof on fire will be difficult: There will be fat, overlapping spectra.
Try observing the Sun, an incandescent light bulb, an LED light, a fluorescent light, a candle flame, gas flame from stove or propane torch, streetlight, red light from electric stove coil. When you observe the Sun, do not put the slit directly on the Sun. It is too bright. Protect your eyes by putting the slit near the Sun, but not directly on it. Keep the Sun just out of the slit. You will still get plenty of light and a bright spectrum. Pay attention to the dark absorption lines you see against the Sun’s spectrum (rainbow). Draw them in on your diagram.
Draw me a picture of your observations of six light sources. Make it look like a long bar, with sections showing the different colors. One bar for each spectrum/light source observed. Use colored pencils. Label the parts of the spectrum indicating colors and brightnesses. Send me a photo or scan of your picture.
Make comments on what you’ve seen. You will need them for your report in the next project. For example, “I was surprised how little yellow light I saw in the spectrum of a candle flame. There definitely wasn’t much blue, but there was a lot of RED.”
I expect you to draw me at least SIX SPECTRA (rainbows). Be a careful observer and recorder. Don’t just make a kindergarten mess with your crayons. I know what these spectra are supposed to look like, so pay attention. This is easy points if you follow instructions the first time. Many of your predecessors did not and brought great pain upon themselves.
To view and identify the main features of the Moon, including craters and maria
To view and identify the main features of the Moon, including craters and maria AND DRAW THEM
NO MORE THAN 1 PAGE!
Instructions: Watch the videos & fill in the blanks. Some videos will be watched
Instructions: Watch the videos & fill in the blanks.
Some videos will be watched in class and some will need completed at home on your own time.
Download an astronomy app. There are many to choose from, and some of them are f
Download an astronomy app. There are many to choose from, and some of them are free.
Instructions:
In paragraph 1, discuss the new resource you have selected. For example–What is it? Where
did you find it? How does it “work?” How will it help you with navigating the night sky?
In paragraph 2, discuss either (1) how you plan to make use of the new resource in the near
future or (2) how you were actually able to use the new resource this week!
Download an astronomy app. There are many to choose from, and some of them are f
Download an astronomy app. There are many to choose from, and some of them are free.
Instructions:
In paragraph 1, discuss the new resource you have selected. For example–What is it? Where
did you find it? How does it “work?” How will it help you with navigating the night sky?
In paragraph 2, discuss either (1) how you plan to make use of the new resource in the near
future or (2) how you were actually able to use the new resource this week!
Download an astronomy app. There are many to choose from, and some of them are f
Download an astronomy app. There are many to choose from, and some of them are free.
Instructions:
In paragraph 1, discuss the new resource you have selected. For example–What is it? Where
did you find it? How does it “work?” How will it help you with navigating the night sky?
In paragraph 2, discuss either (1) how you plan to make use of the new resource in the near
future or (2) how you were actually able to use the new resource this week!