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[vsnet-alert 395] AAVSO News Flash No. 13
- Date: Wed, 17 Apr 1996 15:48:20 -0400 (EDT)
- To: aavso-newsflash@aavso.org
- From: AAVSO <aavso@aavso.org>
- Subject: [vsnet-alert 395] AAVSO News Flash No. 13
- Sender: owner-vsnet-alert@kusastro.kyoto-u.ac.jp
THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
Tel. 617-354-0484 Fax 617-354-0665
INTERNET: aavso@aavso.org
* * * AAVSO NEWS FLASH * * *
Subject: SW UMa, YZ Cnc, SV CMi, EM Cyg, No. 13
V516 Cyg, AB Dra, X Leo, GK Per, April 17, 1996
AY Lyr, CL Sco
________________________________________________________________________________
SW URSAE MAJORIS
The dwarf nova (SU UMa subclass cataclysmic variable) SW UMa continues its
superoutburst, as indicated by the following observations (see AAVSO News
Flash No. 12):
AAVSO Observer
UT JD Mag. Initials
APR 14.880 2450188.380 10.3 BMM
APR 15.13 2450188.63 10.6 DGP
APR 15.847 2450189.347 10.3 GUB
APR 15.880 2450189.380 10.5 BMM
APR 16.830 2450190.330 10.4 JLT
APR 16.8569 2450190.3569 11.3 KHL
APR 17.0604 2450190.5604 10.6 BMM
APR 17.1799 2450190.6799 10.5 BTH
Data in the AAVSO International Database indicate that the last two
superoutbursts of this interesting star were in August 1993 and February
1993.
Observers, particularly those observing with CCD, are urged to monitor SW
UMa every three to five minutes in order to detect superhumps, which have a
period of approximately 1.4 hours (S. B. Howell, P. Szkody, G. Sonneborn, R.
Fried, J. Mattei, R. Oliversen, D. Ingram, and G. Hurst, Astrophys. Journ.,
453, 454-463, 1995). SW UMa has four types of superoutbursts (see above
reference), and observers are requested to monitor SW UMa closely to determine
the type of the current superoutburst, and to find out if SW UMa will show
minor brightening just after it fades to minimum.
----------------------------------------------------------------------------
YZ CANCRI
The dwarf nova (SU UMa subclass cataclysmic variable) YZ Cnc is having a
normal outburst, as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 16.831 2450190.331 12.0 JLT
APR 16.8694 2450190.3694 11.9 KHL
APR 16.9868 2450190.4868 12.1 BMM
APR 17.1979 2450190.6979 12.1 BTH
----------------------------------------------------------------------------
SV CANIS MINORIS
The dwarf nova (Z Cam subclass cataclysmic variable) SV CMi is in outburst,
as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 16.852 2450190.352 13.2 JLT
APR 16.8868 2450190.3868 13.1 BMM
----------------------------------------------------------------------------
EM CYGNI
The dwarf nova (Z Cam type cataclysmic variable) EM Cyg is in outburst, as
indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 17.056 2450190.556 12.5 JLT
APR 17.1326 2450190.6326 12.4 BMM
----------------------------------------------------------------------------
V516 CYGNI
The dwarf nova (U Gem subclass cataclysmic variable) V516 Cyg is having an
outburst, as indicated by the following observation:
AAVSO Observer
UT JD Mag. Initials
APR 17.061 2450190.561 14.0 JLT
----------------------------------------------------------------------------
AB DRACONIS
The dwarf nova (Z Cam subtype cataclysmic variable) AB Dra is in outburst,
as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 14.911 2450188.411 13.1 BMM
APR 15.904 2450189.404 13.2 BMM
APR 16.867 2450190.367 12.6 JLT
APR 17.0410 2450190.5410 12.7 BMM
----------------------------------------------------------------------------
X LEONIS
The dwarf nova (U Gem subclass cataclysmic variable) X Leo is in outburst,
as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 16.842 2450190.342 13.0 JLT
APR 16.9438 2450190.4438 13.0 BMM
APR 17.2174 2450190.7174 12.4 BTH
----------------------------------------------------------------------------
AY LYRAE
The dwarf nova (SU UMa subclass cataclysmic variable) AY Lyr is having a
normal, short outburst, as indicated by the following observation:
AAVSO Observer
UT JD Mag. Initials
APR 17.0903 2450190.5903 13.5 BMM
----------------------------------------------------------------------------
GK PERSEI
The old nova GK Per continues to fade slowly from its minor outburst (see
AAVSO News Flash No. 12), as indicated by the following observations:
AAVSO Observer
UT JD Mag. Initials
APR 16.8333 2450190.3333 11.7 KHL
APR 16.840 2450190.340 11.6 JLT
----------------------------------------------------------------------------
CL SCORPII
The symbiotic variable CL Sco (see AAVSO News Flash No. 12) is continuing
its outburst, as indicated by the following observation:
AAVSO Observer
UT JD Mag. Initials
APR 16.2552 2450189.7552 10.88 CCDV LIW
----------------------------------------------------------------------------
We thank our contributors listed below for the data they have provided for
this News Flash:
BMM - M. Biesmans, Belgium JLT - L. T. Jensen, Denmark
BTH - T. Burrows, USA KHL - M. Kohl, Switzerland
DGP - G. Dyck, USA LIW - W. Liller, Chile
GUB - G. Gubbels, Italy
Please monitor these and other stars closely and phone-in, fax, or e-mail
your observations to the AAVSO.
Good observing!
Janet A. Mattei
________________________________________________________________________________
AAVSO NEWS FLASH is a new electronic publication of the AAVSO intended
to provide observers with timely information on unusual variable star
activity. The basis of the data in this publication will be the
observations reported to AAVSO Headquarters.
The AAVSO NEWS FLASH will not replace the AAVSO Alert Notice. It will
be more frequent and shorter.
If you would like to contribute to AAVSO NEWS FLASH, please send
observations of unusual variable star activity to:
observations@aavso.org
Please include the words NEWS FLASH in the subject line of your message.
If you are affiliated with a variable star organization besides the
AAVSO, and you wish that group to be indicated with the observations
that you provide, please give the specific name of the organization or
group and its abbreviation.
Those who wish to unsubscribe to NEWS FLASH may do so by sending a
message to:
observations@aavso.org
If you would like data from the AAVSO International Database for
research purposes, please send your request to:
Janet Mattei, AAVSO Director, at aavso@aavso.org
We look forward to including your observations in future editions
of AAVSO NEWS FLASH!
_______________________________________________________________________________
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