[vsnet-chat 7309] Re: [AVSON] T Cen

Mon Sep 18 06:03:04 JST 2006

Hi Sebastian and All,

My recent observations also show the current "standstill" of T Cen
continues.

Based on its past performance, T Cen has a usual amplitude of 2.5 to 3
magnitudes, roughly between mags 6 and 9.  At what appears to be irregular
intervals it experiences some cycles where the amplitude is reduced to just
1 magnitude, such as we are currently seeing.

During the 1970s, it seemed to have one or perhaps two such shallow cycles
each year but since then it has behaved more like we have seen in recent
times.

I would expect the current cycle to commence a slow brightening in the near
future, keeping in line with the 90 day period and we should see it return
to maximum during the latter part of October.  At this time, however, T Cen
will be close to conjunction with the sun and therefore difficult to
observe.  The following minimum is due early December when it is again
difficult in the pre-dawn sky and it will be interesting to see if this
cycle returns to a more normal amplitude.  During all this, the 90 days
period should remain evident.

T Cen is clearly one to keep a watch on.  Most interesting.

Best wishes.

Peter Williams
Heathcote NSW

  -----Original Message-----
  From: AVSON at yahoogroups.com [mailto:AVSON at yahoogroups.com]On Behalf Of
Sebastian Otero
  Sent: Monday, 18 September 2006 4:15 AM
  To: avson at yahoogroups.com
  Subject: [AVSON] RY Sgr and T Cen

  Hi, all,

  RY Sgr is showing an increased amplitude in its pulsation cycles:

  http://ar.geocities.com/varsao/Curva_RY_Sgr.htm

  Thus we are not supposed to get excited unless the star gets clearly
fainter than 7th magnitude!

  And T Cen is still in a standstill already lasting more than a month!:

  http://ar.geocities.com/varsao/Curva_T_Cen.htm

  Cheers,
  Sebastian
  __________________________________________________

  Internet gratis. Siempre.
  http://www.fullzero.com.ar

  __._,_.___
  Messages in this topic (1) Reply (via web post) | Start a new topic
  Messages | Files | Photos | Links | Database | Polls | Members | Calendar

  Change settings via the Web (Yahoo! ID required)
  Change settings via email: Switch delivery to Daily Digest | Switch format
to Traditional
  Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe Recent
Activity
    a..  4New Photos
  Visit Your Group
  SPONSORED LINKS
    a.. Southern cross suite darling harbour
    b.. Southern cross hotel dunedin
    c.. Stellar suite
    d.. Southern cross hotel sydney
    e.. Southern cross
  Yahoo! News
  Most Popular News

  What's the most