[vsnet-campaign-v4641sgr 80] V4641 Sgr observation: Gianluca Masi

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

V4641 Sgr observation: Gianluca Masi

    We have received these data.  Compared to this observation, the most
recent observations (as reported by Uemura-san) are very strikingly
"violently varying"!!  The source has resumed its activity.  Please keep
in mind the 1999 September event was preceded month-long activity phase
(sometimes looking interrupted by inactive phases).  There may be a
coming major flare-up.  Please continue observing the object as intensively
as you can!

(from vsnet-campaign 1316)

Dear Colleagues,
finally, I reduced the run on V4641 Sgr, taken on May 31-June 1 with my
friend Franco Mallia at Campo Catino Astronomical Observatory.

The variable was around mag. 14.5 (unfiltered).

Looking at the final lightcurve, the star shows an evident modulation,
with a full amplitude around 0.1 mag. The period of this modulation is
around 25 min and it looks quite periodic.

During the run, covering about 2.7 hours, the star showed a gradual
brightening (about 0.05 mag over the entire run). 


I sincerely thank Raoul Behrend (Observatoire de Gen钁e) for providing
me with a converter from SBIG to FITS format and to adjust it to deal
with the files coming from
the ST-9 CCD camera. Thanks also to all those who responded to my help
request with the conversion.


Kind regards,
Gianluca Masi

-- 
***********************************************************************
* Gianluca Masi                           "Two things fill the soul   *
* Via Madonna de Loco, 47               with awe and reverence [...]: *
* 03023 Ceccano (FR)                     the starry sky above me and  *
* ITALY                                    the moral law within me"   *
* e-mail: gianmasi@fr.flashnet.it                                     *
* web:  http://vsnet.bellatrixobservatory.org             I. Kant       *
* Minor Planet Center Obs. Code: 470 - Ceccano                        *
* Center for Backyard Astrophysics - Italy                            *
* VSNET Collaboration Team member                                     *
* CCD-astrometry-photometry@egroup.com mailing-list moderator         *
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