Date: Wed, 1 Jul 1998 18:03:10 +0300 (IDT) From: Yiftah Lipkin <yiftah@wise1.tau.ac.il> Reply-To: Yiftah Lipkin <yiftah@wise1.tau.ac.il> To: vsnet-alert@kusastro.kyoto-u.ac.jp Message-ID: <vsnet-alert1933@hoge.baba.hajime.jp> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Precedence: list X-Distribute: distribute [version 2.1 (Alpha) patchlevel=24] X-Sequence: vsnet-alert 0 Subject: [vsnet-alert 0] Nova sgr 98 Errors-To: owner-vsnet-alert@kusastro.kyoto-u.ac.jp Sender: owner-vsnet-alert@kusastro.kyoto-u.ac.jp The following letter has been sent to the IAUC ------------------------------------------------------------------- Y. Lipkin, A. Retter and E.M. Leibowitz, Wise Observatory, Tel Aviv University report: On 1998 June 7,8,9,11,12,13 we performed CCD photometry of N Sgr 98 with the 1 m Wise telescope through an I filter, for about 5 hours each night. The light curve is modulated coherently for at least 40 cycles, with either one of the two periodicities 0.17330 or .14765 +/- .00011 days, which are 1 day aliases of each other. The folded data resemle an eclipse light curve, with an average dip of .014 mag. It is likely that similar periodicity modulates the light curve of the star as measured by us already on May 11 and 12.