In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari...
-
Upload
phamkhuong -
Category
Documents
-
view
219 -
download
2
Transcript of In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari...
![Page 1: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/1.jpg)
In the
Berea College Observatory
Ramesh AdhikariJimmy Rop William Chase ColeDr. Tracy Hodge
![Page 2: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/2.jpg)
Objectives of the Project:
* To check the effectiveness of the instruments in the observatory.
* To study the procedure of finding the clear and detailed image of the target star.
* To observe the movement of the star of over a specified period of the time.
* To find out the magnitude of the variables such as RR Lyra and AF Cyg.
* To study the period of RR Lyra with the help of the light curve.
![Page 3: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/3.jpg)
Variable Stars:
*Changes in Brightness
*Intrinsic Variables
•Extrinsic Variable
![Page 4: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/4.jpg)
RR Lyrae:
Classification: Pulsating Variable
Location: Globular Cluster
Period: 0.2 to 2 days
Luminosity: 45L sun appx.
![Page 5: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/5.jpg)
WHY?
Opacity of Helium.Neutral Helium have opacityRadiation gets trapped.Star Shrinks.Energy due to radiation ionizes Heluim.Opacity decreasesRadiation escapes out on the atmosphereStar expands.
![Page 6: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/6.jpg)
Telescope specification:
-16 inch telescope that was constructed by DFM engineering based in New Jersey
-The telescope is driven by a mechanical motor and a computer attached.
Berea College Observatory:
![Page 7: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/7.jpg)
S-Big STS camera:
-2 CCD detectors-Frame Resolution of 765 x 510 pixels-Mounted in close proximity and focused at the same plane
-Remote guiding head port-Electro- mechanical shutter-16 bit analog to digital convertor-Regular Temperature control
![Page 8: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/8.jpg)
Flat Field:Median of the sky frames.Corrects the irregularities I the optical system.Divides out the non-uniformity of the sky.
a) Get the median of the Flatsb) Subtract the 10s dark current image arithmeticc) Divide by 10d) Normalize to 1
Dark Frame:a) Measures the electronic noise in the camera that
needs to be subtracted out.b) Shutter closed.
![Page 9: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/9.jpg)
Calculations:
Magnitude of a Star (m) = -2.5log(I)
Initial Star Image – Dark Frame (At the same time)
For any star image: -------------------------------------------------------------------------------------
Master Flat
Further image reduction was done using Mira software to get the magnitude
of the image of the star.
![Page 10: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/10.jpg)
![Page 11: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/11.jpg)
Working with Star Image
Actual magnitude = Instrumental magnitude + constant
Constant = Actual Magnitude - Instrumental magnitude
RR Lyra (m) = RR Instrumental + constant
RR Lyra(m) = RR Instrumental + SAO Actual Magnitude – SAO Instrumental magnitude
Phase: Time difference between observation/ period of the star
![Page 12: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/12.jpg)
Photographic Image of RR Lyra
Fits image of RR Lyra
http://foto.star-shine.ch/details.php?image_id=426
![Page 13: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/13.jpg)
![Page 14: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/14.jpg)
![Page 15: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/15.jpg)
Conclusions:
. We were able to use the instruments in the observatory effeciently than during the last summer.
. Provided enough time, we could get detail information on the variable stars and continue various characteristics related to them.
. The result we obtained at the end of the research was comparable to the previous data and graphs.
. It would have been better if Berea would have no light, at least during the clear night!!!
![Page 16: In the Berea College Observatory · PDF fileIn the Berea College Observatory Ramesh Adhikari Jimmy Rop William Chase Cole Dr. Tracy Hodge](https://reader034.fdocuments.net/reader034/viewer/2022051722/5a9ba6f47f8b9a18628e3fa2/html5/thumbnails/16.jpg)