photometric bin

Question 1

what are photometric bin?

Question 2

role of inclination

Question 3

EA, EB, EW

Answer 3

eclipsing ALgol type: no contact
eclipsing beta lyrae type: contact
eclipsing W Ursae Majoris type: contact bin w CE

Question 4

prob with ground based obs?

Answer 4

AM
reddening

Question 5

advantage of ground based obs?

Answer 5

cheap

Question 6

solution to AM?

Answer 6

comparison star see if variablity is same

Question 7

conditions fro comparison star?

Answer 7

close by
similar temp
same color (to same reddening effect)

Question 8

other uses of photometric analysis

Answer 8

exoplanet
asteriod

Question 9

telescopes observing for photometric analysis?

Question 10

problem w space based obs.

Answer 10

expensive (data transfer, fewer missions)
light reflection
cosmic rays

Question 11

parameters derived

Answer 11

roche potential from mass ratio

Question 12

types od attachment

Answer 12

detached
contact
overcontact

Question 13

effect of tidal interactions?

Answer 13

circular orbits
synchronised rotation

Question 14

how different lightcurve effects help derive orbital parameters?

Question 15

lc variation w orbital period fro ref, ellipsoid?

Answer 15

ref– sine– orbital period
ellipsoid sine– orbital period / 2

Question 16

parametres info from ellipsoid

Answer 16

ellipsoid deformation is based on tidal forces, roche geometry:
q– deformation (obs in lc) propotional to mass ratio
a– semi major axis inv propotional to distortion
R

Question 17

what is Gravity darkening

Answer 17

tidal forces or fastrotation can make equator more stretched out, T_pole> T_equator

Question 18

what do limb darkening and gravity darkening look like in lc?

Answer 18

limb darkening – rounded curve in eclipse minima

Question 19

what lc effect grav darkenig can be obs with?

Answer 19

ellipsoidal effect

Question 20

what is Gravitational lensing & Gravitational self-lensing ?

Question 21

gravitational lensing, why flux inc? why lc top curve rounded?

Question 22

ellipsoid– why sinosidal variations are asymmteric?

Question 23

relatistiv beaming

Answer 23

in space based missions– flux amplified for blue-shifted. asymmetric amp–
sd + wd

Question 24

which lc variation effect produces diagnostic parameters ?
which dont?

Answer 24

Do:
eclipses: R
relatistic beaming: lc -> R_V
ellipsoid (q, R/a)

Don’t:
grav lensing?
reflection?

Question 25

effcts that cause change in eclipses?

Answer 25

romers delay
rositter mc laugllin effect

Question 26

romers delay

Answer 26

diff masses– slight different dist to observer- slight shift in time light reaches us

Question 27

rositter mclauglin effect

Answer 27

brcause of rotation– some part of star is blushifted and other red– eclipses in blue n red shifted part– effects spectra– radial velocity

Question 28

when is rositter mclaughlin effect more prominent?

Answer 28

fast rotation– far from the center

Question 29

use of rositter mclaughlin effect

Answer 29

more useful for eclipse not at the center
when eclipses are not in the orbital plane (misaligned) eclipse not in the center –
discovery of exoplanets (un aligned, retrogate)
young massive stars otherwise are difficult to find paramters because of rotatinal broadening

Question 30

identify rositter mclaughlin effect in radial vel curve?

Answer 30

for: blueshifted
redshifted
retrograde

Question 31

can you measure mass ratio from romers delay? how?

Answer 31

yes, del t = cont. x K (1- m2/m1)

Question 32

parameters observable for eclipsing binaries?

Answer 32

info of all parameters –
inclination, distance = astrometry
mass = spectra
radius = eclipse

Question 33

how are double line eclipsing binaries amazing?

Question 34

sine lc?

Answer 34

ref or ellipsoid?

Question 35

diff between ref or ellipsoid?

Answer 35

period
ref vary by p
ellipsoid vary by p/2

Question 36

how does romer delay help identify masses?

Question 37

how does ellipsoidal help put constraints on inclination?

Answer 37

lc dependednt on R/a, q and inclination

Question 38

how are gravitational lensing and self gravitational lensing identified in lightucurves?

Answer 38

anti transit or shallower eclipses than estimated

Question 39

use of gravitational lensing?

Answer 39

flux ratio proportional to M2/R1?

Question 40

use of relativistic doppler beaming?

Answer 40

lc –> radial velocity curve –> orbital parameters
cheaper than spectra