does one of you guys know databases where I can search for a star's name and get space velocity and spectrum?
whenever a beautiful asterism enters my eye piece looking like a precious diamond necklace or an abandoned construction site of a highway, my imagination is triggered, and while looking at it, I make up a story of why this string of stars came into being right THERE where it is. It's one of my special enjoyments in our hobby.
The Coathanger, Collinder 399, fitting wonderfully into 12.5x magnification eyepiece, was my first such discovery. Doesn't it look like a short section of a highway with an access loop? As if aliens had planned a bigger highway network and begun construction there - but then ran out of money?
Usually, these diamonds on a necklace aren't actually related to each other but only asterisms, I assume.
But some of them might all have been born in the same nursery far, far away.
Reading about "moving groups" of stars on Wikipedia https://en.wikipedia...inematic_groups as well as in some scientific papers, I think the details to determine "real" from "fake" necklaces are
a) Spectra - if they look the same-ish, the stars have the same metallicity and that's one possible indication for their shared same origin
b) Space velocity. If the stars move with the same speed in 3D space, it could indicate a common point of origin.
From Wikipedia again "The components of space velocity in the Milky Way's Galactic coordinate system are usually designated U, V, and W, given in km/s, with U positive in the direction of the Galactic Center, V positive in the direction of galactic rotation, and W positive in the direction of the North Galactic Pole. The peculiar motion of the Sun with respect to the LSR is
(U, V, W) = (11.1, 12.24, 7.25) km/s,
with statistical uncertainty (+0.69−0.75, +0.47−0.47, +0.37−0.36) km/s"
Now I am looking for a data source where I can look up those details for each star, spectrum and space velocity.
I installed GaiaSky which is a visual 3D interpretation of the GAIA DataRelease2. https://zah.uni-heidelberg.de/?id=660 (Freeware running on Windows, Mac and Linux)
But the graphical user interface doesn't include fields for the information I require. I assume, I would have to add more fields manually to the GUI and then feed information by loading further catalogs. I don't know yet if this is possible.
Or - does one of you guys know databases where I can search a star's name and get space velocity and spectrum?
Thanks a million
Edited by silv, 10 January 2019 - 02:38 AM.