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APASS Conversions to Ic and R

HJZ
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Joined: 2010-09-04
Posted: July 28, 2012 - 2:14pm

Anyone have the conversion formulae handy to convert the Johnson B and V  (or Sloan) values in APASS to Ic and R?

Some conversion references
KTC
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Joined: 2010-12-08
Posted: July 28, 2012 - 3:17pm

Some conversion references:

http://www.aerith.net/astro/color_conversion.html

http://arxiv.org/pdf/astro-ph/0609121v1.pdf

I have not checked, but I think that should answer your needs.

Rc/Ic conversions for APASS
HQA
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Joined: 2010-05-10
Posted: July 28, 2012 - 3:34pm

What we use in Seqplot comes from Jester, et al. (2005)

V-Rc = 1.09 * (r-i) + 0.22  +/- 0.03

Rc-Ic = 1.00*(r-i) + 0.21 _/- 0.01


for stars with (Rc-Ic) < 1.15

We expect to derive our own relationships later in the project.

Arne

AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484