Outburst of CAL 86

(CCD image by Bernard Heathcote)

(CCD image by Berto Monard)


(vsnet-alert 7645)

The X-ray source CAL 86 in the in the direction of the LMC is in outburst.

CAL86          030223.454   132  Stu.RASNZ                          
CAL86          030223.497   132  Stu.RASNZ                          
CAL86          030223.548   132  Stu.RASNZ  

Rod Stubbings                        

(vsnet-alert 7651)

CAL 86 outburst

As reported by Rod Stubbings in [vsnet-alert 7645], the cataclysmic variable CAL 86 (the X-ray source in the direction of the LMC) is in outburst. Th object is located at 05h 46m 15s.26, -68o 35' 24".1 (J2000.0). The quiescent magnitude is V=19.0, and the past recorded outburst was around V=14. The current brightness surpasses the recorded outburst!

The following message is from [vsnet-campaign-dn 2561] (2002 June).

CAL 86: new likely SU UMa-type dwarf nova in the direction of the LMC

According to Schmidtke et al. (AJ 123, 3210), the X-ray source CAL 86 in the direction of the LMC is confirmed to be a short-period cataclysmic variable with a short period (0.0660 d). The object reaches mag 14 at maximum (amplitude 5 mag). The light curve presented is typical of an SU UMa-type superoutburst. Please monitor this object, and make time-series photometry when a new outburs is detected!

   05 46 18.2
   -68 35 37

The amplitude of the present outburst (6.8 mag) should qualify it a genuine superoutburst! Please observe the outburst as intesively as possible to follow the evolution of the superhumps! We would be also happy to receive selected CCD images (in FITS format) to provide a guide for locating the object.
  Recent observations:

  YYYYMMDD(UT)   mag  observer
  20030207.723  <140  (Rod Stubbings)
  20030208.510  <144  (Rod Stubbings)
  20030210.517  <144  (Rod Stubbings)
  20030211.599  <144  (Rod Stubbings)
  20030213.478  <140  (Rod Stubbings)
  20030219.444  <144  (Rod Stubbings)
  20030223.454   132  (Rod Stubbings)
  20030223.497   132  (Rod Stubbings)
  20030223.548   132  (Rod Stubbings)

Taichi Kato
VSNET Collaboration team

Rapid Fading

(vsnet-outburst 5270)

CAL 86 outburst, data from Berto Monard

Dear Colleagues,

Berto Monard has kindly sent Feb. 24 data of CAL 86. The object was fading at a rate of 1.1 mag/d. Although there seems to be a weak signal with a period of ~0.07 d, its amplitude is less than 0.02 mag. These modulations, if any, may be related to orbital humps (or possibly some sort of superhumps??). There was a similar detection of a signal during a rapid fading of an SU UMa-type dwarf nova with a similar orbital period (e.g. AQ Eri, Kato and Matsumoto (1999) IBVS No. 4767). It would be worth following the further progress of the outburst.

Taichi Kato
VSNET Collaboration team

(vsnet-outburst 5276)

(Light curve by Bernard Heathcote)

CAL 86: further data from Bernard Heathcote

Dear Colleagues,

Bernard Heathcote has provided further data on CAL 86 on Feb. 25. Although there is weak modulations, the object was fading rapidly (about 2 mag/d). The light curve bears some resemblance to short (normal) outbursts of NSV 10934 ( Kato et al. (2002) A&A 396, 929). Combined with the unusual X-ray strength and the precipitous fading during the late outburst stage, the same discussion in HT Cam and NSV 10934 would apply to CAL 86. Interestingly, there seem to be some indication of short-term periodicity around 0.025-0.030 d (and its harmonic). These period may be related to, although they look a bit too long and may be a harmonic signal of the orbital period, to spin-related modulations as observed in HT Cam. Further detailed observations during the next outbursts are strongly encouraged.

Taichi Kato
VSNET Collaboration team

(Rapid fading! CCD image by Berto Monard)

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