I Stromgren photometric data in Vizier

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The discussion centers on the challenge of obtaining Stromgren uvby photometric magnitudes from existing catalogs, specifically Paunzen (2015) and Hauck (1997), which only provide indices. Participants explore whether these catalogs contain the desired magnitudes hidden within their data. It is suggested that the indices provided can be used to derive the required magnitudes, although there is confusion regarding the distinction between capital V (Johnson V) and lowercase v (Stromgren v). Ultimately, the thread highlights the difficulty in locating specific photometric data and the need for clarification on the terminology used in the catalogs. The conversation reflects a collaborative effort to solve the problem despite uncertainties.
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Is there a catalog in Vizier that provides Stromgren photometric data for stars, (the all four uvby, not just the indices b-y, m and c)
I would like to try the photometric transform given in my book, for instance ##V = y - 0.12[(b-y) - 0.55]^2##, however, the two catalogs I've consulted, Paunzen, 2015 and Hauck, 1997 only provides the indices. Do these catalogs provide the uvby magnitudes as well, just hidden somewhere? Are there any catalogs that would provide the above photometric magnitudes? Thanks!
 
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yucheng said:
Yes I am aware of that. But...
Just thought I'd point it out. Sorry, I don't know where to find Stromgren uvby photometry.
 
Maybe I'm confused, but it looks like the Paunzen catalog gives v, b-y, and m1=(v-b)-(b-y). Can't you solve those for v, b, and y? Similarly, it gives c1=(u-v)-(v-b), so this gives you u given v, c1, and b.

Edit: Or is V not the same as v?
 
Last edited:
phyzguy said:
Just thought I'd point it out. Sorry, I don't know where to find Stromgren uvby photometry.
That's alright.
phyzguy said:
Maybe I'm confused, but it looks like the Paunzen catalog gives v, b-y, and m1=(v-b)-(b-y). Can't you solve those for v, b, and y? Similarly, it gives c1=(u-v)-(v-b), so this gives you u given v, c1, and b.

Edit: Or is V not the same as v?
I am not very sure, but I think capital V is the Johnson V, not Stromgren v:

Clicking Vmag,
Mean V magnitude
UCD:​
PHOT_JHN_V = Johnson magnitude V (JHN)
 
I think you're right. Oh well, I'm obviously not helping.
 
phyzguy said:
I think you're right. Oh well, I'm obviously not helping.
That's alright! I appreciate your effort and time! Thanks!
 

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