2015A&A...581A..12B


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST19:51:49

2015A&A...581A..12B - Astronomy and Astrophysics, volume 581A, 12-12 (2015/9-1)

Var C: Long-term photometric and spectral variability of a luminous blue variable in M33.

BURGGRAF B., WEIS K., BOMANS D.J., HENZE M., MEUSINGER H., SHOLUKHOVA O., ZHAROVA A., PELLERIN A. and BECKER A.

Abstract (from CDS):

So far the highly unstable phase of luminous blue variables (LBVs) has not been understood well. It is still uncertain why and which massive stars enter this phase. Investigating the variabilities by looking for a possible regular or even (semi-)periodic behaviour could give a hint at the underlying mechanism for these variations and might answer the question of where these variabilities originate. Finding out more about the LBV phase also means understanding massive stars better in general, which have (e.g. by enriching the ISM with heavy elements, providing ionising radiation and kinetic energy) a strong and significant influence on the ISM, hence also on their host galaxy. Photometric and spectroscopic data were taken for the LBV Var C in M33 to investigate its recent status. In addition, scanned historic plates, archival data, and data from the literature were gathered to trace Var C's behaviour in the past. Its long-term variability and periodicity was investigated. Our investigation of the variability indicates possible (semi-)periodic behaviour with a period of 42.3 years for Var C. That Var C's light curve covers a time span of more than 100 years means that more than two full periods of the cycle are visible. The critical historic maximum around 1905 is less strong but discernible even with the currently rare historic data. The semi-periodic and secular structure of the light curve is similar to the one of LMC R71. Both light curves hint at a new aspect in the evolution of LBVs.

Abstract Copyright:

Journal keyword(s): galaxies: individual: M33 - stars: massive - stars: variables: S Doradus - stars: individual: Var C

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10949 1
2 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 359 1
3 [HS53] C s*b 01 33 35.1032949241 +30 36 00.286911666 15.543 16.531 16.429 16.297 16.137 LBV 60 0
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5148 1
5 [HS80] B324 s*y 01 33 55.93 +30 45 30.4 14.941 15.287 14.859 14.545 14.398 A8-F0Ia 30 1
6 [HS80] B416 s*b 01 34 06.5995662243 +30 41 47.601487098 15.118 16.257 16.084 15.858 15.761 O9.5Ia 24 0
7 HD 269006 s*b 05 02 07.3944119328 -71 20 13.118657760 9.93 10.60 10.55 10.43 10.38 LBV 232 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14874 1
9 HD 269662 sg* 05 30 51.4755593461 -69 02 58.591230109 10.23 10.52 10.28 10.40 10.390 A0Ia 91 0
10 HD 269700 s*b 05 31 52.2818792698 -68 32 38.856584550 9.71 10.56 10.54 10.38 10.38 B1.5Iaeq 77 0
11 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2209 0
12 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 592 0
13 NAME Local Group GrG ~ ~           ~ 7000 0

    Equat.    Gal    SGal    Ecl

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2020.08.08-19:51:49

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