[vsnet-alert 2005] Re: "SN 1998di", new He CV

[Taichi Kato <tkato>]

>   I have been examined DSS2 image of the host galaxy of "SN 1998di",
> and awared that there was a foreground star (or condensation) on the
> position which SN candidate was reported (IAUC 6982).  Using USNO
> stars, this stellar object was about 17.0-17.5 magnitude at 1991 Sep.
> 2. (I will examine it more presicely again. )

  I have analyzed the same DSS2 image, and obtained the stellar magnitude
around 21.6.  I hope someone could check the result independently.

  (sample of calibration)
  instrumental mag   USNO
  (from DSS2 flux)    (V)
       12.14        14.51
       12.59        16.61
       13.29        17.59
       14.43        19.44
       13.72        18.19
       14.11        19.31
       13.89        19.28
       14.69        19.25

  From the last unsaturated 6 stars, I obtained V-instrumental=4.82.
The instrumental magnitude of the new CV on DSS2 16.78, getting 21.6??

Regards,
Taichi Kato

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp