2003A&A...412L..25V


Query : 2003A&A...412L..25V

2003A&A...412L..25V - Astronomy and Astrophysics, volume 412, L25-28 (2003/12-3)

η Car: the optical features at the 2003.5 low-excitation event.

VAN GENDEREN A.M., STERKEN C., ALLEN W.H. and LILLER W.

Abstract (from CDS):

UBV and BVR photometry of η Car during the 2003.5 low-excitation event - the considered periastron passage of a binary - is presented. The light and colour curves show a number of features, which were also seen at previous periastron passages: a light maximum of long duration with a superimposed flare-like event which is temporarily interrupted by an eclipse-like dip, and a steep decline in the U-B color index. The R brightness reached a minimum at the time of mid X-ray totality, probably implying that the Hα emission line reached a minimum. The source of the optical flare-like event is probably not the same as the one causing the the X-ray radiation. It is tempting to consider the epoch of the R minimum and the mid- X ray totality - which roughly coincides with the UBV minimum - as the central moment of the 2003.5 low-excitation event.

Abstract Copyright:

Journal keyword(s): technique: photometric - stars: individual: η Carinae - variables - supergiants

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HD 93010 * 10 43 09.4253056320 -61 10 06.721466988 6.07 6.63 6.63     B3III 46 0
2 * eta Car Em* 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2442 0
3 HD 93403 SB* 10 45 44.1198371784 -59 24 28.153300860 6.72 8.46 8.27 8.35   O5.5III(fc)var 194 1
4 HD 93502 SB* 10 46 17.0664615960 -60 36 10.340489520   6.300 6.268     A0IV 33 0
5 HD 93737 sg* 10 48 05.4067650264 -59 55 08.985023076   6.230 6.015     A0Ia/ab 55 0

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