UTF-8 U+6211 U+662F wrote:Hello! I'm thinking of doing Astro next year, is there anything I can do to start preparing now even though we don't know the topics will be?
UTF-8 U+6211 U+662F wrote:Hello! I'm thinking of doing Astro next year, is there anything I can do to start preparing now even though we don't know the topics will be?
Zxcvbnm123 wrote:How do you do question 16 and 17 on the Golden Gate Invitational Test? https://drive.google.com/drive/folders/ ... MRmlHdJc2u
Also, how do you calculate distances to Cepheid and RR Lyrae Stars?
syo_astro wrote:Zxcvbnm123 wrote:How do you do question 16 and 17 on the Golden Gate Invitational Test? https://drive.google.com/drive/folders/ ... MRmlHdJc2u
Also, how do you calculate distances to Cepheid and RR Lyrae Stars?
Have you given those questions a start or have work you can share to check over? That usually makes the checking/explaining go faster.
In the mean time, I'll start things off with 16a. RR Lyrae stars have a period-luminosity relationship that indicates they have an ~constant absolute magnitude (or luminosity) across a range of periods. IF for whatever reason you know you have an RR Lyrae star, you therefore know its absolute magnitude.
- Rant about finding this RR Lyrae abs mag
Anyway, once you get your absolute magnitude, we remember that we need distance (in pc). We are also given apparent magnitude of the star. If you have apparent magnitude and the absolute magnitude of a star, you can use the distance modulus to find the distance in pc.
Does this help?
Zxcvbnm123 wrote:syo_astro wrote:Zxcvbnm123 wrote:How do you do question 16 and 17 on the Golden Gate Invitational Test? https://drive.google.com/drive/folders/ ... MRmlHdJc2u
Also, how do you calculate distances to Cepheid and RR Lyrae Stars?
Have you given those questions a start or have work you can share to check over? That usually makes the checking/explaining go faster.
In the mean time, I'll start things off with 16a. RR Lyrae stars have a period-luminosity relationship that indicates they have an ~constant absolute magnitude (or luminosity) across a range of periods. IF for whatever reason you know you have an RR Lyrae star, you therefore know its absolute magnitude.
- Rant about finding this RR Lyrae abs mag
Anyway, once you get your absolute magnitude, we remember that we need distance (in pc). We are also given apparent magnitude of the star. If you have apparent magnitude and the absolute magnitude of a star, you can use the distance modulus to find the distance in pc.
Does this help?
I tried doing that, but the answer I am getting (around 70,000) is no where near close to the actual answer.
Unome wrote:Zxcvbnm123 wrote:syo_astro wrote:
Have you given those questions a start or have work you can share to check over? That usually makes the checking/explaining go faster.
In the mean time, I'll start things off with 16a. RR Lyrae stars have a period-luminosity relationship that indicates they have an ~constant absolute magnitude (or luminosity) across a range of periods. IF for whatever reason you know you have an RR Lyrae star, you therefore know its absolute magnitude.
- Rant about finding this RR Lyrae abs mag
Anyway, once you get your absolute magnitude, we remember that we need distance (in pc). We are also given apparent magnitude of the star. If you have apparent magnitude and the absolute magnitude of a star, you can use the distance modulus to find the distance in pc.
Does this help?
I tried doing that, but the answer I am getting (around 70,000) is no where near close to the actual answer.
Try an absolute magnitude in the range of 0.55. That said, I took a look at the problem and the answer key seems a bit off to me - it would imply that an RR Lyrae star has an absolute magnitude in the range of 11 to 12.
SciolyHarsh wrote:On the golden gate test, how would you do 17 c, d, and f?
Name wrote:SciolyHarsh wrote:On the golden gate test, how would you do 17 c, d, and f?
- Explantion
- For reference, the question
I think this is right? I don't usually do the math stuff and im kinda rusty on astro math.
SciolyHarsh wrote:Name wrote:SciolyHarsh wrote:On the golden gate test, how would you do 17 c, d, and f?
- Explantion
- For reference, the question
I think this is right? I don't usually do the math stuff and im kinda rusty on astro math.
Sorry i don't really understand what you did for 17f. But thanks for the rest
Name wrote:SciolyHarsh wrote:
Sorry i don't really understand what you did for 17f. But thanks for the rest
Basically apparent separation (arc sec)= separation in au/distance in parsecs. The other part was just how you can calculate it without knowing this equation.
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