study and compare the light curve of 5 different variable stars
TRANSCRIPT
![Page 1: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/1.jpg)
Group Presentation
Study and Compare the Light Curve of 5 different Variable
Stars
![Page 2: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/2.jpg)
A Star fluctuating brightness as seen from Earth
There are two kinds of Variable Stars
Intrinsic Variables :Actual changes on it’s luminosity (eg. change of mass and size)
Extrinsic Variables :Apparent changes(due to the amount of light reaching the earth varies, eg. Eclipse)
What Is Variable Star ?
![Page 3: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/3.jpg)
Variable Star Light Curve
As you can see, chi Cyg is an example of a Variable Star with a period around one year.
![Page 4: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/4.jpg)
Selection of TargetsTools
The International Variable Star Index
Simbad
Skynet
Wiki
Criteria
Period < 1 day
Dec” < -15
At least 1 companion star presents
Visible from telescope for at least 1 period
![Page 5: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/5.jpg)
Variable Star eps CrA
Variable Star V460 Vir
Variable Star V1159 Ori
Variable Star DY her
Variable Star PX And
Our Targets
![Page 6: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/6.jpg)
eps CrA
![Page 7: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/7.jpg)
Light Curve of V*eps CrA
-19.500
-19.000
-18.500
-18.000
-17.500
-17.000
-16.500
Lightcurve of V*eps CrA
MJD
V M
agnit
ude
![Page 8: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/8.jpg)
W Ursae Majoris-type eclipsing variables(extrinsic)
Around 0.3 MJD a periodRelatively balanced periodThe V Magnitude varies between -19 to -17.5
Characteristics of the Light Curve
![Page 9: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/9.jpg)
V460 Vri
![Page 10: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/10.jpg)
Light Curve of V*V460
12.700
12.800
12.900
13.000
13.100
13.200
13.300
Lightcurve of V* V460
MJD
V M
agnit
ude
![Page 11: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/11.jpg)
RR Lyrae variables (intrinsic)Around 0.07 MJD a periodRapid increase and gradual decrease(shark
fin like)V Magnitude varies between 12.81 and 13.25
Characteristics of the Light Curve
![Page 12: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/12.jpg)
V1159 Ori
![Page 13: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/13.jpg)
Light Curve of V*V1159 Ori
15.75
15.8
15.85
15.9
15.95
Lightcurve of V*V1159
MJD
V M
agnit
ude
![Page 14: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/14.jpg)
UGSU dwarf novae(intrinsic)Around 0.4 MJD a periodA more complicated variation which has a
small increase on the down slopeV Magnitude varies between 15.85 to 15.9
Characteristics of the Light Curve
![Page 15: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/15.jpg)
DY Her
![Page 16: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/16.jpg)
Light Curve of V*DY Her
-15.400-15.300-15.200-15.100-15.000-14.900-14.800-14.700-14.600-14.500
Lightcurve of DY Her
MJD
V M
ag
nit
ud
e
![Page 17: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/17.jpg)
δ Scuti type Variables(Intrinsic)Around 0.1 MJD a periodSteeper increasing slope and a gentler down
slope(shark fin like)V Magnitude varies between -18.3 to -14.8
Characteristics of the Light Curve
![Page 18: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/18.jpg)
Px And
![Page 19: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/19.jpg)
Light Curve of V*PX And
12.200
12.400
12.600
12.800
13.000
13.200
13.400
13.600
Lightcurve of PX And
MJD
V M
agnit
ude
![Page 20: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/20.jpg)
Eclipsing binary systems(ext.) and Nova like Star(int.)
Around 0.1 MJD a periodFluctuated(generally with rapid increase and
gradual decrease, shape like a shark fin)V Magnitude varies between 12.7 and 13.4
Characteristics of the Light Curve
![Page 21: Study and Compare the Light Curve of 5 different Variable Stars](https://reader035.vdocuments.mx/reader035/viewer/2022062418/55509d2bb4c90595208b4a02/html5/thumbnails/21.jpg)
Stars /Description
eps CrA V460 Vir V1159 ORI
PX And DY Her
Type of Variables(int./ext.)
Extrinsic Intrinsic Intrinsic Extrinsic+Intrinsic
Intrinsic
Symmetry of the Light Curve
Symmetrical
Asymmetrical
Asymmetrical
Asymmetrical
Asymmetrical
Comparison