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> Int he "b" chart there are also magnitudes to 2 decimal places that are not > of good quality (i.e 865 = 8.58, don't trust Tycho when there's plenty of > PEP from the ground), including a double star (776, but AB (14")= 7.71). ....and for V520 Car, the header goes: V520 Car - Lb - 4.63-4.70 V when the magnitudes are Hp !!!! It can be guessed when you find a "455" besides the star's dot..... These confussions between photometric systems or even the assumption that Hp or Vt magnitudes are the same as V are very common. Be careful with that. And NSV 4922, it is a good 4.66 comparison star visually. Regards, Sebastian. > > For CCD photometry, the "e" chart show two stars: 73 (HD 93403) = 7.30 that > is actually 7.27 (who said Tycho-2 is the better choice for bright stars? > See Hipparcos and GCPD data) and 93 (HD 93343), that turns out to be a mess: > In Reed (1998) you can see the following notes: "Doble/SB/Multiple" > In the TIC catalogue, two stars are described: > > 1) GSC 8626 2018 - Pos: 10 45 13.043 -59 44 19.98 - B mag. 9.60 > 2) GSC 8626 2838 - Pos: 10 45 12.389 -59 44 26.18 - B mag. 9.80 > > I couldn't find the second star in other catalogues and UCAC1 and USNO-B1.0 > return only one entry. > There are dozens of PEP measures in the GCPD and VizieR and they go from > 9.17 to 9.64 (generally around V= 9.58) and B-V 0.24-0.35 (redder when > brighter). > It is also a ROSAT source. > An O8V star that seems to be variable or contaminated by a companion. > > See the charts at my website for eta and AG Carinae as a reference: > > ETA CARINAE: > http://ar.geocities.com/varsao/Carta_eta_Car.htm > AG CARINAE: > http://ar.geocities.com/varsao/Carta_HD_95687.htm > > Regards, > Sebastian. > >
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
