[vsnet-alert 4993] V725 Sgr rapid variation?

[Taichi Kato <tkato>]

V725 Sgr rapid variation?

  The unique (see below) variable V725 Sgr is reported show a rapid
brightening.  Confirmatory observations are strongly encouraged.

  YYYYMMDD(UT)   mag  observer
  20000305.844  <135  (A. Pearce)
  20000429.749  <122  (T. Watanabe)
  20000511.522   130  (P. Williams)
  20000514.497   130  (P. Williams)
  20000527.462   133  (P. Williams)
  20000603.519   130  (P. Williams)
  20000604.469   130  (P. Williams)
  20000605.453   130  (P. Williams)
  20000606.453   130  (P. Williams)
  20000609.496   129  (P. Williams)
  20000614.467  <135  (P. Williams)
  20000617.812   121  (A. Pearce)

  More information:

Subject: [vsnet-chat 3106] V725 Sgr (Greaves)

Try:

http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1998hcsp.proc..171W&db_key=AST&high=390983001602616

[which is all one line, in case the email wraps it].

which'll give you an informative abstract.

In sum though, they reckon it is still unique in this 1998 paper
abstract, whilst also saying it may be some sort of Pop II RV Tau or SR
star... ...and they feel that regular pulsation may be due for a return.

Cheers

John

JG, UK

--

  And also from Andrew Pearce:

Last night I observed V725 Sgr in bright moonlight and made it mag 12.1 on June
17.812UT.  This is much brighter than Peter's last estimate of <13.5 on June
14.468 UT reported on vsnet-obs 28211.

The variable is located very close to a mag 13.6 comparison star, but I am able
to easily resolve them in the 16".  It was definitely slightly brighter than
the two mag 12.2 comparison stars located on the RASNZ VSS chart.

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