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Alert Notice 154: Possible Nova in Sagittarius [V4157 Sgr] AND New Request to monitor high-glalactic latitude cataclysmic variables for IUE observing runs

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
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Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 154 (February 14, 1992)

POSSIBLE NOVA IN SAGITTARIUS   [V4157 Sgr]

William Liller, Vina del Mar, Chile, reports his discovery, using the PROBLICOM method, of a possible nova in Sagittarius on February 13.35 UT at photographic magnitude 7.0 (two exposures were made). An earlier exposure made on February 7.35 showed nothing to magnitude 10. The approximate position of the object (epoch 1950) is:

R.A. 18 06.8  Dec. -25 51

The object was independently discovered photographically by Paul Camilleri, Cobram, Vic, Australia, on Feburary 13.743 UT at magniutude 7.5. An earlier photograph made on February 6.739 showed notheing to magnitude 10.

Accompanying is a finder chart from the AAVSO Variable Star Atlas showing the object. Also enclosed is a Royal Astronomical Society of New Zealand chart which gives a fainter sequence. Please use these charts to observe this possible nova, and report your observations to AAVSO Headquarters so we may inform the astronomical community. When you report your observations, please be sure to tell us which sequence you are using.

Congratulations to Bill and to Paul on their discoveries!

 

NEW REQUEST TO MONITOR HIGH-GALACTIC LATITUDE CATACLYSMIC VARIABLES FOR IUE OBSERVING RUNS

We have been asked once again to assist astronomers at the Planetary Science Institute in Arizona with their ongoing (i.e, there is no cut-off date) IUE observations of high-galactic latitude cataclysmic variables in outburst. As described in AAVSO Alert Notice 145, they are interested in monitoring the outbursts with IUE and in arranging simultaneous ground-based photometric and spectroscopic observations.

The new list of stars in which the astronomers are interested is given below.

Desig.      Name      Max - Min

0103+59  HT Cas  12.6-19.32 V
0139+37  AR And  11.0-17.3 P
0203+56a UV Per  11.0-17.5 V
0457+26  HW Tau 11.5-(17  P
1701-32  FQ Sco  12.0-18.45 B
1723-42  MM Sco  13.0-18.53 B
1725-62  FV Ara 12 - (18   P
1754-34b V551 Sgr  13.5-20  P
1841+43  V344 Lyr  14.5-(20  P
1841+37 AY Lyr  12.5-18.4 B
1932+02  V1141 Aql  14.5-20.0 P
1951-09  UU Aql  11.0-16.8 P
2003+17  WZ Sge   7.0-15.53 B
2110+13  EF Peg  10.7-(17  P
2325+43  DX And  10.9-16.4 P

The astronomers are still interested in any outburst activity of the stars on their first target list, included here for your reference.

Desig.      Name      Max - Min

0418-13  AH Eri  13.5-17.5 P
1132+02  RZ Leo  11.5-17.5 P
1147+49  BC UMa  10.9-18.3 B
1227-14  AL Com  13.0-20.0 P
1439+22a UZ Boo 11.5-(16.1 V
1454+41  TT Boo  12.7-(15.6 P
2106-09  VY Aqr  8.0-16.6 P
2125-03  VZ Aqr  11.3-17.2 P

Please monitor these stars, and call in to Headquarters your observations of any you see go into outburst. Telephone calls to Headquarters in connection with the above request will be reimbursed by the astronomers. Please submit your telephone charges to Headquarters for reimbursement.

Your close monitoring of the cataclysmic variables listed above and prompt reporting of any activity is critical to the success of these observing runs.

I thank you very much for your efforts and for your valuable astronomical contributions.

Good observing!

, Director

Attachment: V4157 Sgr (Nova Sgr 1992): AAVSO Variable Star Atlas excerpt and RASNZ SV Sgr chart on one page

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