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[vsnet-sequence 176] Re: vsnet-chat 5472 [HR Car]
HR Carinae has been on the observing program of the the VSS, RASNZ for at
least 40 years, but the comparison stars are few in number and have not been
updated. Fortunately, with the release of Tycho-2 data it is quite easy to
set up an extensive sequence for this bright variable. If one wishes to look
deeply at stars within 10' of HR Car, down to 14.0V or so, there is a nice,
short paper by A.M. van Genderen et al, Astron. Astrophys 246,407-410
(1991). They give the distance to HR as 5kpc+/-1 kpc. Luminosity is Mbol
~-8.9, making it consistent with other LBVs. Using data from Tycho-2 and
the van Genderen paper, I have compiled the following V sequence. The stars
below 10.0 would probably get little use.
Star RA 2000 DEC 2000 V B-V Source
Remarks.
======================================================
HD 89740 10:19:40.71 -59:08:45.9 6.95 -0.12 T
HD 90274 10:23:42.42 -59:12:21.8 7.07 1.10 T
HD 90087 10:22:20.88 -59:45:19.7 7.79 0.03 vG RASNZ
a, 7.7
HD 90313 10:23:54.98 -59:30:47.9 8.37 0.35 vG RASNZ
b, 8.4
HD 90436 10:24:50.67 -59:47:32.7 9.15 -0.04 T RASNZ
c, 8.6 Note 1.
HD 90245 10:23:28.94 -59:42:43.9 9.48 0.09 vG RASNZ
d, 9.5
HD 90178 10:22:57.30 -59:40:43.8 9.86 0.02 vG
HD 90137 10:22:39.35 -59:31:15.3 10.04 0.02 vG
HD 302827 10:24:22.14 -59:36:32.2 10.63 0.14 T CPD-58
2165, Note 2.
.............. 10:24:27.02 -59:44:52.5 10.60 0.66 T
CPD-59 2100, Note 2
HD 302823 10:22:22.42 -59:37:23.6 11.35 0.13 vG
T = Tycho-2
vG = A.M. van Genderen et al, Astron. Astrophys. 246,407-410 (1991).
Notes:
1) HD 90436. Buscombe (1994) gives V=9.24, B-V =0.02 (source not given).
The long adopted visual mag. of 8.6 (Series 1 charts, VSS, RASNZ), is in
need of revision. There is a companion 48" to the NE (HD 305136, 9.80V).
2) CPD-58 2165 and -59 2100. Photometry is taken from Tycho-2 (no suitable
stars in vG list). Probable errors are of the order of +/- 0.060 in V, +/-
0.068 in B-V.
Regards,
Mati Morel
morel@ozemail.com.au
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