1. Home
  2. Forums
  3. Variable Stars
  4. Novae

V339 Del fading in B faster than in V??

WGR
Affiliation
American Association of Variable Star Observers (AAVSO)
Fri, 10/25/2013 - 12:39

Hello

Did a short run last night, and V339 Del was fainter in B than in V by 0.2 mags.  If real, this is another big change and a challenge for the Pro's to explain.  Cannot wait for other postings in B and V this morning.  Could also be a dreaded systematic.  No changes on my end, that I know of.

Gary (WGR)

TCB168
Affiliation
Variable Stars South (VSS)
Sun, 10/27/2013 - 00:06
Nova Del

[quote=WGR]

Hello

Did a short run last night, and V339 Del was fainter in B than in V by 0.2 mags.  If real, this is another big change and a challenge for the Pro's to explain.  Cannot wait for other postings in B and V this morning.  Could also be a dreaded systematic.  No changes on my end, that I know of.

Gary (WGR)

[/quote]

I took measurements of the Nova last night-admittedly 12 hours out from your "last night" due to me being in Oz.

Transformed BV measurements using an ensemble gave B-V of -0.154

This is the reverse of what you have described.

A simultaneous spectra does not show any brightening of the blue end of the continuum from my measurments taken 4 days earlier.

Hopefully this is helpful.

Cheers

Terry B (BHQ)

Stan Walker
Affiliation
Royal Astronomical Society of New Zealand, Variable Star Section (RASNZ-VSS)
Sun, 10/27/2013 - 01:18
V339 Del

I had a brief look a the data on this star after reading Arne's earlier post and the discussion elsewhere over sequences.

It's very noticeable that the scatter in B is about half that in V. I didn't bother looking in detail any further but this suggests that those observers who use two filters and calibrate their equipment are getting better results than the single filter people This would be expected but not to the extent seen here.

This star is not as strange as HR Del - which was the first noiva I ever observed - but it still has an interesting slow light curve.

Regards,

Stan Walker

JohnMarsh
Affiliation
Madrid Astronomical Association M1 (Spain) (AAM)
Fri, 12/18/2020 - 06:03
The master key is used for

The master key is used for the entry for the halls and all shapes of the arming for the team. The implication of the turns and pay someone to do my assignment for the keys. The suggestions controlled for the approval of the considered items or the options for the theme.