1997A&AS..124..517V


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.18CEST07:44:46

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.

Abstract Copyright:

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

Simbad objects: 14

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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 - 2019
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9018 1
2 HD 6884 s*b 01 07 18.2183812921 -72 28 03.658768522   10.32 10.2     B9Ia0ek 109 0
3 HD 269006 s*b 05 02 07.3944119328 -71 20 13.118657760 9.93 10.60 10.55 10.43 10.38 LBV 228 0
4 HD 33579 sg* 05 05 55.5119227765 -67 53 10.930943931   9.32 9.13     A2Ia+ 123 0
5 V* S Dor sg* 05 18 14.3572490675 -69 15 01.148131817 9.08 10.39 10.25 9.74 9.14 A5Iaeq 335 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14211 1
7 HD 269662 sg* 05 30 51.4755593461 -69 02 58.591230109 10.23 10.52 10.28 10.40 10.390 A0Ia 88 0
8 HD 269858 s*b 05 36 43.6942807271 -69 29 47.449383685   10.24 10.15 9.95 9.05 LBV 259 2
9 HD 90177 s*b 10 22 53.8426931454 -59 37 28.361118869 9.16 9.66 8 8.15   LBV 298 0
10 HD 93010 * 10 43 09.4251147627 -61 10 06.720169562 6.07 6.63 6.63     B3III 32 0
11 * eta Car Em* 10 45 03.5362075818 -59 41 04.053436648 6.37 6.82 6.21 4.90 4.41 OBepec 2141 0
12 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 578 0
13 * zet01 Sco s*b 16 53 59.7270104119 -42 21 43.313745214 4.80 5.31 4.79 4.32 3.86 B1Ia-0ek 340 0
14 HD 160529 sg* 17 41 59.0257256544 -33 30 13.702939546 8.17 7.87 6.66 5.50 4.51 A2Ia 180 1

    Equat.    Gal    SGal    Ecl

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2019.08.18-07:44:46

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