dwarf nova

Alert Notice 290: Supernova 2001el in NGC 1448 (Horologium) AND Request to monitor cataclysmic variables for XMM-Newton observations

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
INTERNET:  aavso@aavso.org
Tel. 617-354-0484       Fax 617-354-0665

AAVSO ALERT NOTICE 290 (September 20, 2001)

0341-44B  SUPERNOVA 2001el IN NGC 1448 (HOROLOGIUM)

Alert Notice 295: 1753-30B Nova Sagittarii 2002 AND 0006-12 WW Cet request to monitor for RXTE observations

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
INTERNET:  aavso@aavso.org
Tel. 617-354-0484       Fax 617-354-0665

AAVSO ALERT NOTICE 295 (April 16, 2002)

1753-30B  NOVA SAGITTARII 2002

Alert Notice 139: Nova Herculis 1991 AND Outburst of 2325+43 DX Andromedae

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
BITNET: aavso@cfa8 SPAN: nssdca::cfa8::aavso
Tel. 617-354-0484 FAX 617-354-0665

                        AAVSO ALERT NOTICE 139 (March 29, 1991)

NOVA HERCULIS 1991

This bright nova is fading rather fast as indicated by the following observations:

Alert Notice 333: Possible New Dwarf Nova in Cet (ASAS023322)

January 21, 2006

SUBJECT: Possible New Dwarf Nova in Cet (ASAS023322)

Bogumil Pilecki, Warsaw University Astronomical Observatory, reports on a possible new nova or dwarf nova discovered by the ASAS3V instrument. Coordinates by David Boyd (BDG) using UCAC2 as reference are:

RA: 02:33:21.398 +/- 0.07 Decl.: -10:47:04.55 +/- 0.07 (J2000)

The previously unobserved object was first detected by ASAS3V on Jan 20.121 UT at magnitude 12.08 in V.

Alert Notice 334: Possible New Nova/Dwarf Nova in Hya

January 28, 2006

SUBJECT: Possible New Nova/Dwarf Nova in Hya

Grzegorz Pojmanski, Warsaw University Astronomical Observatory, reports on a possible new nova or dwarf nova discovered by the ASAS3V instrument. The previously unobserved object was first detected by ASAS3V at RA = 10h 25m 22s DEC = -15d 42'.4 (assumed J2000) on Jan 26.245 UT at magnitude 12.219 in V.

Alert Notice 371: Support for XMM-Newton Observations of SS Aurigae

March 6, 2008: Dr. Patrick Godon (Villanova University / STScI) requests observations of the dwarf nova SS Aurigae (AAVSO Designation 0605+47) during the next several weeks in support of XMM-Newton X-ray observations. They request nightly visual and instrumental observations to determine whether the star was in outburst or quiescence during the observation scheduled for 2008 March 22/23 UT. Observations before, during, and after the scheduled X-ray observations will be used in their final analysis. Please begin observing now, and continue until at least April 5.

Alert Notice 379: Support for Spitzer observations of tremendous outburst amplitude dwarf novae (TOADs)

May 16, 2008 : Dr. Steve Howell (NOAO) requests monitoring of a subset of the known and suspected tremendous outburst amplitude dwarf novae (TOADs) in support of Spitzer Space Telescope observations of these objects. Observers are asked to increase their monitoring of the objects in the table below in support of this campaign.  We note that several of these objects -- notably the WZ Sge stars WZ Sge, GW Lib, and V455 And -- are not expected to superoutburst during the next year, but observations are still encouraged in case they exhibit unexpected behavior.