Cluster & Association Members Ernst Paunzen IfA, Vienna.
-
Upload
phoebe-reeves -
Category
Documents
-
view
226 -
download
3
description
Transcript of Cluster & Association Members Ernst Paunzen IfA, Vienna.
![Page 1: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/1.jpg)
Cluster & Association Cluster & Association MembersMembers
Ernst PaunzenErnst PaunzenIfA, ViennaIfA, Vienna
![Page 2: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/2.jpg)
Why consider Clusters Why consider Clusters Members?Members?
Clusters offer astrophysical Clusters offer astrophysical properties “for free”:properties “for free”:
1.1. AgeAge2.2. DistanceDistance3.3. ReddeningReddening
Not depending on any Not depending on any temperature, log g, absolute temperature, log g, absolute magnitude calibrationmagnitude calibration
![Page 3: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/3.jpg)
The BRITE HRDThe BRITE HRDWithout reddening: M(V) = -5 mag and V = 4 mag => distance = 630 pc
-6; 4; 1000-5; 4; 630-4; 4; 400-3; 4; 250-2; 4; 160-1; 4; 100+0; 4; 65
![Page 4: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/4.jpg)
Clusters within 750 pcClusters within 750 pc-6; 4; 1000-5; 4; 630-4; 4; 400-3; 4; 250-2; 4; 160-1; 4; 100+0; 4; 65
log t < 8.0 (blue)log t < 9.0 (yellow)log t > 9.0 (red)
Several Cluster Members in the BRITE sample!
WEBDA: http://www.univie.ac.at/webda
![Page 5: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/5.jpg)
Cluster Properties and Cluster Properties and MembershipMembership
Cluster formation within a few Cluster formation within a few MyrsMyrs
From one large Molecular CloudFrom one large Molecular Cloud Membership criteria due to proper Membership criteria due to proper
motions and radial velocitiesmotions and radial velocities
![Page 6: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/6.jpg)
Isochrones IIsochrones I
Padova Isochrones
![Page 7: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/7.jpg)
Isochrones IIIsochrones II
280KHuge Errors!
![Page 8: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/8.jpg)
Lines of Equal MassesLines of Equal Masses2.
5 m
agError:M(V) = 0.1 magMass = 0.1 M(sun)
+ Error in log Teff
Padova Isochrones
![Page 9: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/9.jpg)
Precision of Age DeterminationPrecision of Age Determination
Values from the Literature Paunzen & Netopil, 2006, MNRAS, 371, 1641
![Page 10: Cluster & Association Members Ernst Paunzen IfA, Vienna.](https://reader035.fdocuments.net/reader035/viewer/2022062503/5a4d1ad07f8b9ab0599711c3/html5/thumbnails/10.jpg)
Why consider Clusters Why consider Clusters Members?Members?
Clusters offer astrophysical Clusters offer astrophysical properties “for free”:properties “for free”:
1.1. Age, error about 15%Age, error about 15%2.2. Distance, error less than 10%Distance, error less than 10%3.3. Reddening, error less than 5%Reddening, error less than 5%
Values can be improved!Values can be improved! ““Only positive membership needed” Only positive membership needed” Precise mass estimation possiblePrecise mass estimation possible Huge data base (WEBDA) in ViennaHuge data base (WEBDA) in Vienna