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          ELECTRONIC NEWSLETTER OF THE EUVE OBSERVATORY 
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 Vol 3, No. 4a  4/01/93                                ISNN 1065-0793
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 The following is a report on the results reported at the
 EUVE Science Team meeting on Friday, March 26th, 1993.  For
 additional information on specific topics, please contact
 the individual scientist listed at "name@cea.berkeley.edu".
 
 ANOTHER WHITE DWARF DISCOVERY
 -----------------------------
 Dr. Stephan Vennes reports on the detection in the Lexan/Boron
 filter of the white dwarf EUVE J2503-923.  The count rate detected
 was 0.15 cps.  Using his model atmosphere code, Dr. Vennes derives 
 from this flux a  temperature of 73,857K, a H/He ratio of 0.00345, 
 a hydrogen column density of log NH=18.75 and a very low metal 
 abundance.  Dr. Vennes states, "Im not confident in the metal abundances
 yet to report any numbers, but the next version of the code should 
 pin them down".  Dr. David Finley questioned the temperature derivation, 
 as his code measures 73,095K.
 
 EUVE DETECTS 10,000th EUV SOURCE
 -----------------------------
 Dr Antonella Fruscione has released a new version of the
 internal EUVE Bright Source List covering the first 150 days
 of the sky survey. In addition to the 24 sources detected
 in the IOC and calibration, there are 9976 sources detected
 by the new automatic detection software (see below) and verified visually
 as "definite" sources. The breakdown of the 9976 sources is
 as follows:
 
 3087 Late type stars
 1487 WD
  137 comets
  110 B stars
   47 brown dwarfs
   43 CVs
   19 planets
    4 moons
    1 barium star
    1 berkelium star
    1 Voyager 2
    1 Elvis
    0 AGN
 
 5035 sources with no optical counterpart as yet
 
 NEW SOURCE DETECTION ALGORITHM DEVELOPED
 ----------------------------------------
 
 Dr. Herman Marshall reported on the new detection algorithm
 developed for EUVE.  It consists of a revised medium entropy/
 minimum likelihood statistical approach that emphasizes dots
 on the skymap.  "You know, 1.65 sigma is 90% significant, which
 isn't bad odds at all.  One photon can be a significant detection"
 states Dr. Marshall, referencing the Journal of Meteorlogical 
 Forecasting, Vol. 85, pg. 245, 1948.
                                              
 
 SOLAR COMPANION (NEMESIS) DISCOVERED
 ------------------------------------
 
 Dr. Stuart Bowyer reports the discovery in the EUV of the Sun's
 sister star, Nemesis.  Nemesis, so named after its implication
 in the death of the dinosaurs, has been one of the holy grails  of 
 astronomy.  "My grad student wanted to hold back this announcement 
 until I taught him a thing or two about statistics.  A two sigma 
 source is pretty damned good, and the fact that it is on the ecliptic
 was the nail in the coffin." explained Dr. Bowyer who concluded
 with "See you all in Stockholm at the Nobel awards".
 
 EUVE MEASURES 3K COSMIC BACKGROUND
 ----------------------------------

 Dr. Richard Lieu reported a preliminary measurement of the
 octopole moment of the primordial 3 degree cosmic background.
 "We are double checking to make sure this isn't a microwave 
 leak in our filters.  The derived spectrum has a temperature of
 3.14159 K, so the COBE results are suspect."

 EUVE GO PROGRAM MAXIMIZES EFFICIENCEY
 -------------------------------------
 
 Dr. Carol Christian reports that the Guest Observer program
 is proceeding smoothly with the increased observing efficiency using 
 the Pointed Observations for Guest Observers algorithm or "POGO", 
 where two sources are observed per orbit, one at day and one at night.  
 Dr. Christian claims that the observing efficiency has increased to 70%, 
 surpassing many other NASA programs.  "The key to the success of POGO is 
 dropping the satellite constraint checking, which are usually redundant 
 and unnecessary.  Besides, constraints are for wimps!"   However, a slight 
 hitch in the program later developed (see below).
 
 EUVE DETECTS THE SUN
 --------------------
 
 The Duty Scientist, Dr. Jeremy Drake reports the detection of the
 Sun in the EUVE.  "We always assumed it was bright, but this detection
 confirms it.  It was actually a serendipitous observation resulting from 
 a bug in the POGO algorithm" reports Dr. Drake.  "We also confirmed the
 Sun's variability, as its flux fell to zero counts per second after
 only a few seconds of observation.  This neatly confirms my brand new 
 magnetically driven massive, alternating sunspot model."
 
 EUVE DIFFUSE BACKGROUND VARIABLE
 --------------------------------
 
 Dr. Patrick Jelinsky reported that the EUV background was variable and
 currently in a "low" state of 0 cps.  He also believes it is associated with
 the Solar variability discussed above as the background rate drop was
 coincident with the Solar rate drop.
 
 CD ROM ISSUED AT BERKELEY AAS MEETING
 -------------------------------------
 
 EUVE will issue its first CD ROM at the American Astronomical Society
 Meeting at Berkeley in June of 1993.  On the CD will be the 
 EUVE Bright Source List, the source code for the Won Ton Soup Model(trademark) 
 of the interstellar medium, one order of pork fried rice, and the text 
 of the acceptance speech to be given in Stockholm by Prof. C. Stuart Bowyer.
 
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 The EUVE Electronic Newsletter is issued by the  Center  for  Ex-
 treme  Ultraviolet Astrophysics, University of California, Berke-
 ley. The opinions expressed are those of the  authors, and not of
 the University of California or NASA.   Publishers: Rogre F. aMlnia, 
 and C. Stuart Bowyer.
 Send newsletter correspondence to: nobody@cea.berkeley.edu (Internet)
 EUVE Public Archive via FTP: ftp.cea.berkeley.edu, pub/archive
 ----------------------------------------------------------------
 The EUVE Project is managed by NASA's GSFC.  The Project  Manager
 at  GSFC  is  Mr. Les Oversite, the Project Scientist is Dr. Seymour
 Sources, the Deputy Project Scientist is Dr. Alfred E. Neuman.  The
 NASA  Headquarters  EUVE Program Scientist is Dr. Barry Welsh
 the Deputy Program Scientist is Dr. Ann Othersource,  the  Program
 Manager is  Dr. Ray Trace.  The Project Operations Director
 is Mr. Will Gettoitlater.  Information  on  the EUVE  Guest Observer 
 Program is available from:  Dr. Squirmin Herman,  Mail Code 999  GSFC, 
 Greenbelt, MD 20771 (301)555-3485; euve@stars.SPAN.NASA.GOV