Which catalog is best?

"Lucy" wrote in message
...

I am looking for a good catalog of stars.

[ snip ]

If it could go out to 200 to 300 light years, it would be great.

The ESO has just announced a paper:

"The Geneva-Copenhagen survey of the Solar neighbourhood: Ages,
metallicities and kinematic properties of ~14,000 F and G dwarfs"

by B. Nordström et al. The full article is available in PDF format here.

http://www.edpsciences.org/papers/aa...ses/aa0959.pdf

In the paper the give the address of the electronic form of the catalog
of the 14k stars. IIRC this goes to about 140 ly, within this distance
I estimate there are about 3x that many stars. This is a guess based
on the Initial Mass Function ( more K & M stars, fewer OBAs ), but
it is only a guess. Based on this a complete catalog to 300 ly would
have about 330k entries.

Dark skies,

tom

--
We have discovered a therapy ( NOT a cure )
for the common cold. Play tuba for an hour.

(Tom Kirke) writes:

"Lucy" wrote in message
...

I am looking for a good catalog of stars.

[ snip ]

If it could go out to 200 to 300 light years, it would be great.

The ESO has just announced a paper:

"The Geneva-Copenhagen survey of the Solar neighbourhood: Ages,
metallicities and kinematic properties of ~14,000 F and G dwarfs"

by B. Nordström et al. The full article is available in PDF format here.

http://www.edpsciences.org/papers/aa...ses/aa0959.pdf

In the paper the give the address of the electronic form of the catalog
of the 14k stars. IIRC this goes to about 140 ly, within this distance
I estimate there are about 3x that many stars. This is a guess based
on the Initial Mass Function ( more K & M stars, fewer OBAs ), but
it is only a guess. Based on this a complete catalog to 300 ly would
have about 330k entries.

An attempt to exhaustively survey _all_ stars down through M-type subdwarves
within a mere 10 parsecs (~32.6 ly) of Sol is curently being carried out
by the RECONS group: http://www.chara.gsu.edu/RECONS/. To detect stars
out to 300 ly would obviously be much harder, since they would be up to
~100 times dimmer, and there will be ~1000 times as many stars to survey.

The 2MASS survey is attempting to detect all objects brighter than
1 mJy in the J, H, and K_s infrared bands,
http://www.ipac.caltech.edu/2mass/overview/about2mass.html;
this survey will hopefully detect many nearby L- and T-type brown dwarves,
http://www.ipac.caltech.edu/2mass/overview/dwarfs.html.
but will represent an exhaustive survey of them.


-- Gordon D. Pusch

perl -e '$_ = \n"; s/NO\.//; s/SPAM\.//; print;'

CORRECTION --- I wrote:

The 2MASS survey is attempting to detect all objects brighter than
1 mJy in the J, H, and K_s infrared bands,
http://www.ipac.caltech.edu/2mass/overview/about2mass.html;
this survey will hopefully detect many nearby L- and T-type brown dwarves,
http://www.ipac.caltech.edu/2mass/overview/dwarfs.html.
but will represent an exhaustive survey of them.

The last line above should read: "Will _NOT_ represent an exhaustive survey
of them"... :-(


-- Gordon D. Pusch

perl -e '$_ = \n"; s/NO\.//; s/SPAM\.//; print;'