Are there any large star databases containing mass and density?


by Xilor
Tags: databases, density, mass, star
Xilor
Xilor is offline
#1
Apr2-13, 01:14 PM
P: 90
Hi, I was trying to find large star databases to work with, but found that most of the databases I could find did not come close to what I was looking for. Is it possible the data I'm looking for just doesn't exist yet?
The data I'm looking for should preferably contain all kinds of stars and be mostly based on the closest stars since that data would probably be the most accurate and complete. But after searching for a while, all the databases I could find were too small (I was hoping for 50000+) or were missing variables that are important to me (mass, density, whether it is part of a binary/trinary system, spectral type, position, space velocity) and the 'would be nice' variables (age, total redshift, lifetime phase, error bars) or I couldn't actually download them.

I'm starting to suspect such databases don't exist or aren't placed online, possibly because mass and density might not be too easy to calculate. But I was hoping that someone here might be able to point me to databases I missed.
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Bandersnatch
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#2
Apr2-13, 02:14 PM
P: 551
Have you tried Hipparcos?
http://heasarc.gsfc.nasa.gov/W3Brows...tml#crl_dec_ra

It's a large database of some +110 000 stars with very precise parallax data(you'll have to convert it to distance yourself).
It includes proper motion data, but no mass.
As far as I'm aware you'll have a hard time finding a catalogue with mass data, as this quantity is not easy to determine.
Xilor
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#3
Apr2-13, 02:47 PM
P: 90
I haven't tried that, it does seem to have a lot more information than the one I was using. Which was the one downloadable here: http://www.astronexus.com/node/34
But without mass it doesn't really add what I'm looking for. I'm currently trying to find a way to use a combination of luminosity and spectral data to lump the stars in categories and to then try and estimate the mass of them based on those categories and the luminosity. But that would add so much uncertainty that it's probably not worth pursuing.

Bandersnatch
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#4
Apr2-13, 03:00 PM
P: 551

Are there any large star databases containing mass and density?


Depends on whether you need to be precise or not, you could guesstimate the masses from luminosity and spectral types via the mass-luminosity relation. I think.

edit: (which is what you've just said yourself, I've noticed)
Chronos
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#5
Apr2-13, 04:20 PM
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Stellar mass and size [diameter] can only be accurately measured for binary systems and has only been done for a small number of stars. See http://www.astronomy.ohio-state.edu/.../binaries.html for further discussion. The largest stellar mass table I am aware of is by Belikov (1995) http://vizier.u-strasbg.fr/viz-bin/VizieR-4, which only has a few hundred entries.


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