RE: Mike's TN: Planetary Transits

["Gutzwiller, Michael" <mgutzwiller@lanvision.com>]

Actually we will not have a really random sample when we use the Mark IV.
Since the photometry must be very good we will be limited to brighter stars.
Thus there won't be any dim red dwarves., i.e. we will be biased towards
stars in the upper portion of the HR diagram.  This also matches somewhat
the bias in the radial velocity studies.

Mike G.


-----Original Message-----
From: Albertson, Chris [mailto:CAlbertson@primeadvantage.com]
Sent: Tuesday, February 27, 2001 4:03 PM
To: 'Michael Gutzwiller'; tass@listserv.wwa.com
Subject: RE: Mike's TN: Planetary Transits



Mike,

I think the "problem", if it is a problem.  Is that
your statistics were based on N transits seen for
1000 stars monitored.  I think those 1000 stars were
selected based on some cataloged attributes and were not
just any 1000 stars that happened to be in some random
frame.

Now if you point a TASS Mk IV up at the sky you are
essentially picking stars at random.  Most will not have
the attributes of the selected 1000 stars and the (chance
of seeing a transit)/star will be less.  No big deal.
We will look at a million stars.