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[vsnet-alert 69] Discovery of a new variable star!?


Dear Colleagus,

   During the course of our systematic survey of dwarf novae at Ouda
Station, Kyoto University, we discovered a "new" bright (V~13.6) object
in the vicinity of the cataloged position of V725 Aql.  At the
corresponding position of the CV chart by Downes & Shara, there seems
to be only a very faint star (V~19?), and is clearly different from
V725 Aql identified in this chart.  We only know old UBV photometry of
V725 Aql, which is claimed to lack ultraviolet excess.  It is likely
we have rediscovered "true" V725 Aql in outburst (if so, the large outburst
amplitude suggests a low outburst frequency -- intensive observations
during the current outburst would be therefore highly recommended).
However, the cataloged range of variability of V725 Aql (13.7-16.2p)
is against this interpretation.  Does anyone have more information
on this star?  Other interpretations are also possible: a nova?
a new large-amplitude variable star? (an LPV interpretaion is less
likely because red-to-infrared sensitive CCD images during "quiescence"
could not show a bright star at this position).  No numbered minor
planet was at this position.  Furthermore, three sequential CCD
exposures could not show any motion.  Spectroscopic and/or multi-color
photometry are most helpful in this stage.

   We here attaches a vsnet-format V-band CCD chart for convenience
of observers.  We would like to hear any positive/negative observations.

Best regards,
Daisaku Nogami

-----------------------------------------------------
frame DD74494   900 V725 Aql             V         
date 95  3  8.82493     (GSC mag.)
 396 1070 1465 0 
 398 23399 1534 0 
 573 21615 1624 0 
 805 22341 1290 0 
 809 23901 1561 0 
 1016 13873 1646 0 
 1225 14538 1622 0 
 1536 19756 1698 0 
 1519 20897 1530 0 
 1799 3483 1490 0 
 1823 24985 1535 0 
 1866 13033 1545 0 
 2026 8739 1532 0 
 2334 25600 1523 0 
 2230 28055 1678 0 
 2530 6082 1178 0 (113)
 2532 20939 1598 0 
 2612 3421 1518 0 
 2835 13272 1456 0 
 2940 23790 1590 0 
 3331 1761 1523 0 
 3266 26730 1506 0 
 3442 18400 1665 0 
 3503 17302 1678 0 
 3712 23160 1653 0 
 3739 7345 1672 0 
 3962 19083 1667 0 
 3789 27408 1524 0 
 3910 1101 1493 0 
 3993 2256 1619 0 
 4525 26546 1444 0 
 4621 28341 1546 0 
 4886 10257 1592 0 
 4801 22018 1226 0 (121)
 5036 2167 1641 0 
 4854 4995 1583 0 
 5095 6767 1522 0 
 5195 1003 1509 0 
 5126 8068 1507 0 
 5323 10839 1557 0 
 5392 20625 1501 0 
 5611 11470 1411 0 
 5723 2679 1424 0 
 5901 15416 1202 0 (121)
 6204 1004 1496 0 
 6248 17224 1516 0 
 6193 18669 1574 0 
 6705 1592 1488 0 
 6675 21075 1632 0 
 6787 28069 1651 0 
 6910 16717 1488 0 
 6993 12844 1431 0 
 7295 3783 1685 0 
 7501 1405 1497 0 
 7554 19526 1414 0 
 7554 25905 1603 0 
 8177 1102 1461 0 
 7991 12477 1665 0 
 8133 18634 1515 0 
 8117 24168 1647 0 
 8201 1967 1564 0 
 8400 5409 1454 0 
 9108 17604 1668 0 
 9289 1101 1557 0 
 9168 14676 1555 0 
 9309 15274 1607 0 
 9669 4487 1606 0 
 9764 28302 1645 0 
 10151 20465 1634 0 
 10323 819 1558 0 
 10312 26550 1181 0 (119)
 10676 19608 1588 0 
 10884 10965 1317 1 (138+145)
 11136 6218 1425 0 
 11324 1209 980 1 (94)
 11278 6750 1478 0 
 11344 15794 1656 0 
 11372 13116 1582 0 
 11394 27456 1583 0 
 12029 24396 1657 0 
 12132 14871 1379 0 (143)
 12407 2277 1694 0 
 12508 1390 1514 0 
 12606 7416 1688 0 
 12695 3441 1515 0 
 13029 17462 1374 0 
 13013 18920 1649 0 
 13242 26063 1393 0 
 13288 1191 1550 0 
 13413 24007 1304 0 (130)
 13670 4493 1615 0 
 13681 27395 1544 0 
 13926 5676 1640 0 
 13856 12457 1605 0 
 14029 10282 1591 0 
 14079 14312 1616 0 
 14321 17523 1550 0 
 14317 7778 1609 0 
 14312 15652 1653 0 
 14401 1209 1492 0 
 14478 9590 1452 0 
 14636 12926 1537 0 
 14738 16493 1359 0 object in question
 14724 25961 1518 0 
 14830 17120 1248 0 (126)
 15026 3025 1651 0 
 15162 18299 1607 0 
 15380 8010 1583 0 
 15457 15269 1475 0 
 15608 1310 1483 0 
 15672 16497 1685 0 
 15904 25535 1606 0 
 15871 26644 1324 0 (132)
 16063 20518 1600 0 
 16365 24102 1596 0 
 16312 1593 1476 0 
 16305 22023 1563 0 
 16710 7379 1686 0 
 16703 2109 1546 0 
 16941 18595 1675 0 
 17318 790 1522 0 
 17363 5958 1490 0 
 17732 15215 1597 0 
 17903 1212 1499 0 
 18026 10221 1576 0 
 18166 19502 1630 0 
 18370 12354 1526 0 
 18475 18608 1523 0 
 18497 1490 1488 0 
 18613 2707 1613 0 
-----------------------------------------------------
  (x   y  mag sat)

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