1998A&A...333..565S


Query : 1998A&A...333..565S

1998A&A...333..565S - Astronomy and Astrophysics, volume 333, 565-570 (1998/5-2)

Cyclicities in the light variations of Luminous Blue Variables. II. R40 developing an S Doradus phase.

STERKEN C., DE GROOT M. and VAN GENDEREN A.M.

Abstract (from CDS):

Stroemgren differential photometry of R40 collected during the time interval 1986-1996 is analysed together with Walraven photometry. The gradual brightening of the star over the last 10 years can be described by a linear trend with superimposed oscillations (in v, b and y) with frequency 0.0008c/d (∼1300d cycle). We interpret these oscillations as ``normal S Dor'' phases, and suggest that the quasi-linear brightening of the star is the ascending branch of a growing very-long-term S Dor phase (VLT-SD), as found by van Genderen et al. (1997A&A...318...81V) in AG Car and S Dor itself. As R40 is now becoming fainter and bluer, the length of the VLT-SD cycle is about 20 years.

Abstract Copyright:

Journal keyword(s): stars: individual: HD 68884 = R 40(SMC) - stars: variables: other - supergiants - stars: oscillations - Magellanic Clouds

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 - 2022
#notes
1 HD 6884 s*b 01 07 18.2182685856 -72 28 03.657105156   10.32 10.2     B9Ia0ek 119 0
2 HD 6997 * 01 08 06.8036060616 -73 00 48.051254988   9.92 9.07     G8III 25 0
3 HD 7031 * 01 08 38.5770385128 -71 50 07.032948828   9.37 8.57     G5wF6 22 0
4 HD 10747 * 01 41 17.9039417352 -75 39 49.118705820   8.01 8.15     B2V 41 0
5 V* S Dor sg* 05 18 14.3570612088 -69 15 01.149576912 9.08 10.39 10.25 9.74 9.14 A5Iaeq 363 0
6 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 611 0

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2022.05.24-08:56:58

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