V1548 Aql : Nova Aql 2001, many rebrightenings

According to THE ASTRONOMER Electronic Circular No 1633, M. Collins discovered a variable object, TAV J1907+117. The object was reported to be at mag 10.9 on May 11.99 UT (vsnet-campaign 900). IAUC 7627 announced the object as possible nova in Aql (vsnet-campaign 905), and then, C. Benn et al. took a spectrum with the 4.2-m William Herschel Telescope on May 17 and confirmed its nova nature (vsnet-campaign-nova 307). E. Schweitzer reported that D. Proust also confirmed it through a spectrum on the 193mm OHP telescope on May 18 (vsnet-campaign-nova 311). M. Uemura, T. Kato, and H. Yamaoka reported a faint star of r=18.7 exists on DSS images within 0"".5 of the position of the nova (vsnet-campaign-nova 308). Pre-discovery observations reported by K. Kanatsu and K. Takamizawa show that the object has already brightened since February 26 2001 and a long premaximum halt and a sharp peak, as observed in V723 Cas and DO Aql (vsnet-campaign-nova 306). T. Kato reported that, in spite of the long-lasting premaximum halt, the decline rate may be unexpectedly rapid as reported on May 18-19 (vsnet-campaign 909), but N. James reported that his observations show no prompt decline trend (vsnet-campaign-nova 313). The object became slightly brighter from May 21 (vsnet-campaign-nova 318), and then, again started gradual fading (vsnet-campaign-nova 325). The fading trend possibly stopped in the end of May (vsnet-campaign-nova 329). Since the early June, the object again started fading (vsnet-campaign-nova 330). In mid-June, the object rebrightened to the second maximum (vsnet-campaign-nova 363). The object then again gradually faded (vsnet-campaign-nova 373), and again re-brightened on June 28 (vsnet-campaign-nova 376). After the gradual fading from the rebrightening, it showed oscillations, and then, again started fading (vsnet-campaign-nova 407).

This nova experienced some another rebrightenings during the latter half of 2001: 13.0mag on July 25 (vsnet-campaign-nova 418), 13.5mag on mid-August (vsnet-campaign-nova 430), 13.7 on September 2 (vsnet-campaign-nova 508), 13.6mag on September 11 (vsnet-campaign-nova 557). 13.0mag on October 4 (vsnet-campaign-nova 607). 13.2mag on November 20 (vsnet-campaign-nova 657).

Chart presented by O. Trondal

CCD image presented by G. Masi

Other related articles: vsnet-campaign 901, 902, 903, vsnet-campaign-nova 301, 302, 304, 305, 309, 310, 314, 316, 321, 322, 324, 326, 327, 328, 336, 337, 343, 347, 352, 370, 382, 388, 389, 544, 558, 563, 591, 614, 626

Low resolution spectrum presented by M. Gavin: http://home.freeuk.com/m.gavin/tanova.htm
Sequence presented by A. Henden: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/naql01.dat
Chart presented by R. Bouma and E. van Dijk: http://www.shopplaza.nl/astro/vs-charts/nova2001aql1.htm

General Information on This Object