# 1997A&AS..124..517V

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 Query : 1997A&AS..124..517V

1997A&AS..124..517V - Astron. Astrophys., Suppl. Ser., 124, 517-531 (1997/September-0)

New perceptions on the S Doradus phenomenon and the micro variations of five Luminous Blue Variables (LBVs).

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

Abstract (from CDS):

We investigated the photometric histories of the LBVs HR Car in the Galaxy, R127, R110 and R71 in the LMC, and R40 in the SMC by collecting all available photometry. All these objects have been reasonably well observed over the last few decades and a number of S Dor (SD) phases'' (episodes of enhanced light) is well documented. Time-scales lie between 1.4 and 25y. During the SD cycles two different types of micro-variations (amplitudes ∼0-2) are present: one near the minima (time-scale from 2 to 6 weeks; colours generally blue in the maxima and red in the minima) and the other one near the maxima (time-scale ∼100d; colours generally red in the maxima and blue in the minima). Halfway the ascending and descending branches of the SD cycles the stars switch rather abruptly from one type to the other. We argue that the two types of SD phases are probably caused by different instability mechanisms.

Journal keyword(s): technique: photometric - stars: individual: HR Car = HD 90177, R127 = HDE 269858, R40 = HD 6884, R71 = HDE 269006, R110 = HDE 269662 - stars: variables - stars: supergiants - stars: oscillations

Full paper

 Number of rows : 14
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10314 1
2 HD 6884 s*b 01 07 18.2182685856 -72 28 03.657105156   10.32 10.2     B9Ia0ek 119 0
3 HD 269006 s*b 05 02 07.3942092168 -71 20 13.116800076 9.93 10.60 10.55 10.43 10.38 LBV 244 0
4 HD 33579 sg* 05 05 55.5114721104 -67 53 10.932988848   9.32 9.13     A2Ia+ 133 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 364 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16153 1
7 HD 269662 sg* 05 30 51.4749432240 -69 02 58.590657600 10.23 10.52 10.28 10.40 10.390 A0Ia 98 0
8 HD 269858 s*b 05 36 43.6936418088 -69 29 47.451149232   10.24 10.15 9.95 9.05 LBV 277 2
9 HD 90177 s*b 10 22 53.8430096928 -59 37 28.363616256 9.16 9.66 8 8.15   LBV 320 0
10 HD 93010 * 10 43 09.4253056320 -61 10 06.721466988 6.07 6.63 6.63     B3III 43 0
11 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2333 0
12 V* AG Car WR* 10 56 11.5781414448 -60 27 12.810673260 7.00 7.57 6.96 7.73   WN11h 613 0
13 * zet01 Sco s*b 16 53 59.7271314888 -42 21 43.307334468 4.80 5.31 4.79 4.32 3.86 B1Ia-0ek 361 0
14 HD 160529 sg* 17 41 59.0261939376 -33 30 13.704456780 8.17 7.87 6.66 5.50 4.51 A2Ia 192 1

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2022.08.09-19:46:36