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[vsolj-alert 673] XTE J1118+480 period

XTE J1118+480 period


Date: Mon, 10 Apr 2000 13:27:04 -0400
From: Michael Garcia <garcia@head-cfa.harvard.edu>
Subject: [vsnet-alert 4603] (No Subject in original)

In response to VSNET-ALERT 4599, we note that on the nights of March
31 and April 1 (UT) we obtained 15 and 7 spectra (respectively) with
the FLWO 1.5m telescope and FAST spectrograph (3500-7000A, 5A
resolution).  On both occasions, the He II 4686 emission line shows an
S-wave modulation.  While the spacing and coverage of our data does
not allow an accurate determination of the period of the S-wave, it
does suggest the period is between 4 and 5 hours.  This lends support
to the suggestion of Cook, Patterson and Fried (IAUC 7397) that the
orbital period is 0.1706(9) day (see also Cook, VSNET-ALERT 4554).

From: M. Garcia, J. McClintock, W. Brown, M. Pahre,  
(Harvard/Smithsonian Center for Astrophysics)

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