2005A&A...437..977A


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.26CET00:50:57

2005A&A...437..977A - Astronomy and Astrophysics, volume 437, 977-981 (2005/7-3)

Millimeter-wave emission during the 2003 low excitation phase of η Carinae.

ABRAHAM Z., FALCETA-GONCALVES D., DOMINICI T.P., NYMAN L.-A., DUROUCHOUX P., McAULIFFE F., CAPRONI A. and JATENCO-PEREIRA V.

Abstract (from CDS):

In this paper we present observations of η Carinae in the 1.3mm and 7mm radio continuum, during the 2003.5 low excitation phase. The expected minimum in the light curves was confirmed at both wavelengths and was probably due to a decrease in the number of UV photons available to ionize the gas surrounding the binary system. At 7mm a very well defined peak was superimposed on the declining flux density. It presented maximum amplitude in 29 June 2003 and lasted for about 10-days. We show that its origin can be free-free emission from the gas at the shock formed by wind-wind collision, which is also responsible for the observed X-ray emission. Even though the shock strength is strongly enhanced as the two stars in the binary system approach each other, during periastron passage the X-ray emission is strongly absorbed and the 7mm observations represent the only direct evidence of this event.

Abstract Copyright:

Journal keyword(s): stars: individual: η Carinae - stars: binaries: general - stars: circumstellar matter - stars: winds, outflows - radio continuum: general

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 - 2021
#notes
1 GRS G287.55 -00.63 Rad 10 44.7 -59 40           ~ 2 0
2 GRS G287.57 -00.59 Rad 10 45 01.6 -59 38 26           ~ 3 0
3 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 906 2
4 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2246 0
5 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6322 3

    Equat.    Gal    SGal    Ecl

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2021.01.26-00:50:57

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