Add some bright variables to the catalog (Mira, Chi Cyg)
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Mira:
HD 14386, HIP 10826, HR 681. Its HIP Vmag is 6.47 (near the center of its range). Its BSC Vmag is 3.04.
Chi Cyg:
HD 187796, HIP 97629, HR 7564 In HIP its Vmag is 7.91. Its BSC Vmag is 4.23.
With my Vmag limit of 6.0, the Vmag in their Hipparcos records filters-out these variables from my catalog.
Is there a way of catching all such cases?
The field H6 is a coarse variability flag, which could at least give me a list of candidates for inclusion.
1: < 0.06mag ; 2: 0.06-0.6mag ; 3: >0.6mag
There is a separate variability annex file hip_va_1.dat for periodic variables, whose fields P7 and P9 state the observed max and min magnitudes. The docs for fields P7 and P9 show that these are Hp magnitudes, not Johnson-V:
"Fields P7 and P9 provide the magnitudes at maximum and minimum luminosities.
These were derived from (folded) light-curve fitting on the basis of the Hp photometry
for approximately 90 per cent of the stars in the section of periodic variables"
The Band field (P22) in the variability annex seems to refer only to the literature section, since it seems to appear only when the literature-mag is present.
Sources of the 'literature' fields:
"Information entered in Fields P18–P22 and U18–U22 is largely taken from the General
Catalogue of Variable Stars, 4th edition GCVS; P.N. Kholopov et al., Publ. Office
‘Nauka’, Moscow, 1985–88) and its updates, either through the CDS (Strasbourg), or
from the data base of the American Association of Variable Star Observers (AAVSO),
as communicated by J. Mattei. "
VizieR shows 76 candidates with V-literature range bracketing 6.0.
It shows 49 candidates with Hp range bracketing 6.0.
T CrB is in there, but its outbursts are rare. Its type is NR (recurrent nova).
My latest code adds 68 variable stars to the catalog, using data from the Hipparcos variability annex (1 and 2). I exclude novas.
The range in Vmag of these variables brackets the limiting mag of the output catalog.
Mira and Chi Cyg are the brightest examples that I found, out of the 68 added.