2008MNRAS.384.1649D

Query : 2008MNRAS.384.1649D

2008MNRAS.384.1649D - Mon. Not. R. Astron. Soc., 384, 1649-1656 (2008/March-2)

The periodicity of the η Carinae events.

DAMINELI A., HILLIER D.J., CORCORAN M.F., STAHL O., LEVENHAGEN R.S., LEISTER N.V., GROH J.H., TEODORO M., ALBACETE COLOMBO J.F., GONZALEZ F., ARIAS J., LEVATO H., GROSSO M., MORRELL N., GAMEN R., WALLERSTEIN G. and NIEMELA V.

Abstract (from CDS):

Extensive spectral observations of η Carinae over the last cycle, and particularly around the 2003.5 low-excitation event, have been obtained. The variability of both narrow and broad lines, when combined with data taken from two earlier cycles, reveal a common and well-defined period. We have combined the cycle lengths derived from the many lines in the optical spectrum with those from broad-band X-rays, optical and near-infrared observations, and obtained a period length of Ppres= 2022.7±1.3 d.

Spectroscopic data collected during the last 60 yr yield an average period of Pavg= 2020±4 d, consistent with the present-day period. The period cannot have changed by more than ΔP/P = 0.0007 since 1948. This confirms the previous claims of a true, stable periodicity, and gives strong support to the binary scenario. We have used the disappearance of the narrow component of Hei 6678 to define the epoch of the Cycle 11 minimum, T0= JD2452819.8. The next event is predicted to occur on 2009 January 11 (±2 d). The dates for the start of the minimum in other spectral features and broad-bands are very close to this date, and have well-determined time-delays from the Hei epoch.


Abstract Copyright: 2008 The Authors. Journal compilation © 2008 RAS

Journal keyword(s): stars: general - stars: individual: eta Carinae - stars: binary

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* S Dor sg* 05 18 14.3570612088 -69 15 01.149576912 9.08 10.39 10.25 9.74 9.14 Be3 395 0
2 * zet Pup BY* 08 03 35.04754 -40 00 11.3321 0.89 1.98 2.25 2.36 2.58 O4I(n)fp 1190 1
3 * tet Car SB* 10 42 57.4019674 -64 23 40.020796 1.53 2.54 2.76 2.87 3.10 B0Vp 351 0
4 NAME Homunculus Nebula ISM 10 45 03.5 -59 41 04           ~ 379 1
5 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
6 * zet Oph Be* 16 37 09.5400587698 -10 34 01.509742704 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1908 0

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