[vsnet-alert 5382] (fwd) RXTE observations of YY (DO) Dra

[Taichi Kato <tkato>]

(fwd) RXTE observations of YY (DO) Dra

From: Koji Mukai <mukai@milkyway.gsfc.nasa.gov>
Subject: RXTE observations of YY (DO) Dra
Date: Fri, 17 Nov 2000 13:45:22 -0500 (EST)

Northern Observers,

We have been granted TOO observation of YY (DO) Dra with the RXTE
satellite during the current outburst, as follows (all times UT).

Nov 19	00:34-01:35
	02:14-03:16
	03:54-04:51

Nov 20:	00:27-01:28
	02:06-03:08
	03:47-04:43

	22:40-23:42
Nov 21:	00:20-01:22
	01:58-03:00

We hope to be able to track the X-ray flux and X-ray spin pulse shapes
in decline (unfortunately, spacecraft safety concerns during the Leonids
have prevented earlier RXTE observations --- but we'll still get good
data).

Dr. Szkody has pointed out that, during the last outburst, X-ray and
optical spin pulses were out of phase.  We would therefore like to
request all observers capable of fast photometry to obtain as much
data as weather etc. permit --- this system has a 530 s spin period,
but most of the modulations are at 1/2 the spin period and its orbital
sideband.  Simultaneous photometry with RXTE would be particularly
valuable; even if not simultaneous, any data that would allow us to
track the evolution of spin modulation during the outburst decay
would be highly useful.

				Best wishes,

					Koji Mukai
				(mukai@milkyway.gsfc.nasa.gov)

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