Answered: 5. If the extinction in the infra-red… | bartleby

Related questions

Question

5. If the extinction in the infra-red K-band (filter central wavelength = 2.13 micrometers) is
10-times less than it is in the optical V-band (filter central wavelength 550 nm), what
affect would a cloud with Av 2 have on the flux density observed in V and K if the star's
intrinsic V-band apparent magnitude is 15?
=
=

Expert Solution

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Blurred answer

Follow-up Questions

Read through expert solutions to related follow-up questions below.

Follow-up Question

I think it wants us to calculate Mk how would we do this? We were given the equation m1-m2 = -2.5log to base 10 (f1/f2)

Solution

by Bartleby Expert

Similar questions

Describe the plysical environment and processes to obtain the emission line spectra and absorption line spectra from the stars. Describe the physical environment and processes to obtain the emission line spectra and absorption line spectra from the stars. haha maintained a high
1. Spectral signatures can be described using luminosity values in different spectral regions. UV Blue Green Red NIR Forest 28 29 36 27 56 Water 22 23 19 13 8 Corn 53 58 59 60 71 Pasture 40 39 42 32 62 Assuming these signatures are influenced by atmospheric effects: is it possible to separate the different categories based on the values in this table? Which band (s) are the most useful for distinguishing between the different classes in this table and why?
1) a) Calculate the Jeans length for the dense core of a giant molecular cloud with T=10 K, n = 1010/m³, and µ=2. b) Estimate the adiabatic sound speed for this core, using y=5/3. c) Use this speed to find the amount of time required for a sound wave to cross the cloud t3=2Rj/vs. d) Compare your answer with the free-fall scale and comment your results.
1. Sirius A has an apparent magnitude of 4.72, determine its luminosity.
A)The star 58 Eridani is a feint but naked-eye star similar to the Sun. Suppose that you are observing this star in the night sky without a telescope. Ignoring any interstellar extinction or atmospheric absorption, approximately how many photons per second arrive at your retina? Show all steps in calculation . B) The Mid-infared Instrument (MIRI , camera and spectrograph ) on the James Webb Space Telescope operates in the band 5-28 µm . For 58 Eridani , approximatley how many photons per second can be used by this instrument ? Assume that MIRI takes all the photons from the full JWST mirror . Show all steps in calcultation . Describe breifly two or three other factors which play a role in determining the sensetivitu of an instrument such as MIRI ?
3- Consider a binary star system in which the two stars are seen to be 1.50" apart. Determine the actual physical separation of those stars (in AU) if this binary system is located 9.50 1.y. from us.
Which portion of the EM spectrum is best for understanding the giant Molecular Clouds from which stars are born? Far infrared GXUVIR a. FAR IR b. VISIBLE OC. NEAR IR Od. Molecular Clouds are not shown in any of them Oe. All show the clouds equally well Visible wwwwwwww GXUVR Near infrared. www GXUVIR
Cas A SNR North Lobe Chandra ACIS image (M. Stage) region of spectrum-> 10* km/s (be sure to convert your answer to kilometers!) (Enter a positive value--if you get a negative answer ignore the minus sign.) 1000 100 Combine counts / Ang./ (0.964324 sq. arcsec) 10 1 0.1 Cas A Ms Spectrum from 4362.5 4458.5, region size 0.964324 sq. arcsec Silicon line werden der 5 10 20 Wavelength (Angstroms) The speed of the material ejected in a supernova can be measured by using the Doppler shift of the X-ray emission lines in its spectrum. The images above show real X ray data of the Cassiopeia A supernova remnant and a spectrum extracted from that data--you can see several emission lines including the silicon line near 6.6 angstroms (0.66 nm). If the emission line created by silicon normally has a wavelength of 0.6648 nm (nanometers), but is measured in the spectrum to have a wavelength of 0.6599 nm, how fast is the gas moving?
5... Calculate the fraction of time a spacecraft spends in daylight given a celestial body with a radius 5,709 km at an altitude of 686 km. Use the extreme case (minimum alpha) when the angle between the orbit plane and the direction of the sunlight is 0.
Q1