2006A&A...458..225V


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST08:14:07

2006A&A...458..225V - Astronomy and Astrophysics, volume 458, 225-234 (2006/10-4)

The present status of four luminous variables in M 33.

VIOTTI R.F., ROSSI C., POLCARO V.F., MONTAGNI F., GUALANDI R. and NORCI L.

Abstract (from CDS):

Understanding the origin of the instabilities of LBVs is important for shedding light on the late evolutionary stages of massive stars and on the chemical evolution of galaxies. To investigate the physical nature of variable stars in the upper H-R diagram, we performed a spectrophotometric study of the Romano's star GR 290 and the Hubble-Sandage variables A, B, and C in the close galaxy M 33. New spectroscopic and photometric data were employed in conjunction with already published data of these stars in order to derive spectral types, energy distribution and bolometric luminosities. The yellow hypergiant Var A is still at minimum, with a ∼G-type spectrum and strong Hα emission (Weq≃-35Å). Var B is in a low luminosity hot state (V=17.5, B-V=-0.15) with very strong Hα emission (Weq=-310Å). Its absolute bolometric luminosity is 0.6x106L. Var C, at V=16.4, is fainter than in the mid 1980s, but its spectrum shows the typical features of LBVs at maximum, a spectrum that is very rich in Fe ii emission lines. Its Lbol is about 0.7x106L. The Romano's star GR 290 has a rich hot emission-line spectrum and is very bright with Lbol=3x106L. During 2004 the star brightened by ∼half magnitude in each of the BVR filters. Our observations confirm that Var A probably is an intermediate type hypergiant star surrounded by an expanding envelope with a collisionally excited hydrogen emission, largely obscured by dusty disk and nebula. In recent years, Var B has undergone a blueward transition in the H-R diagram, probably at constant bolometric luminosity, while Var C is in a post-maximum phase with an η Car-type spectrum. GR 290 is notable for its spectrum and luminosity, and it is likely to develop ample spectral variations in the near future, similar to those observed in AG Car.

Abstract Copyright:

Journal keyword(s): stars: evolution - stars: variables: general - supergiants - galaxies: individual: M 33

VizieR on-line data: <Available at CDS (J/A+A/458/225): table2.dat GR290_field.jpg>

Simbad objects: 33

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Number of rows : 33

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 [BGK2002] B16 V* 00 54 44.645 -37 42 39.13   18.91 19.02     WN11 6 0
2 NGC 300 GiG 00 54 53.4460065856 -37 41 03.182962667 8.83 8.69 8.13 7.46   ~ 1310 2
3 QSO B0109+224 BLL 01 12 05.8246825085 +22 44 38.786096536   16.00 15.66 15.47   ~ 296 2
4 [HS53] A s*y 01 32 32.8024103986 +30 30 25.014155970 20.1 19.9 19.1 18.6 17.7 F8Ia 51 0
5 [HS80] B5 WR* 01 32 37.72 +30 40 05.6 16.445 17.498 17.627 17.447 17.473 Ofpe/WN9 26 0
6 [HS53] M 33 Var A 17 V* 01 32 47.4386765843 +30 30 28.228009084   17.66 16.95 16.3   ~ 4 0
7 [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
8 [HS53] B s*b 01 33 49.1983926201 +30 38 09.102418246 15.330 16.243 16.208 16.026 15.947 LBV 50 0
9 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5149 1
10 [MAP95] M 33 OB88 1 * 01 34 57.1782100133 +30 41 46.004928965 17.837 18.784 18.872 18.915 18.974 B2II 2 0
11 [MAP95] M 33 OB88 3 * 01 34 58.76 +30 41 59.5 18.71 19.61 19.83     ~ 1 0
12 [MAP95] M 33 OB88 4 * 01 34 58.79 +30 42 03.0 18.39 19.35 19.52     ~ 1 0
13 [HS80] R18 WR* 01 34 58.9048211236 +30 40 26.631154602   19.07 17.53 16.62   ~ 4 0
14 2MASS J01345978+3041569 s?r 01 34 59.784 +30 41 56.95 18.46 20.69 19.16 18.04 16.6 ~ 4 0
15 2MASS J01350026+3043060 WR* 01 35 00.2710772859 +30 43 05.987371843   19.01 17.69     ~ 4 0
16 [MAP95] M 33 OB88 9 * 01 35 01.16 +30 41 06.6 19.10 20.04 20.12     ~ 1 0
17 [M98a] M 33a-314 s?r 01 35 02.0360537239 +30 40 34.154582039 20.979 19.865 18.500 17.897 17.267 ~ 5 0
18 [MAP95] M 33 OB88 10 s*b 01 35 02.2754807329 +30 41 53.596120372 17.786 18.834 18.933 18.979 19.073 B0.5Ia 2 0
19 [MPH2006] 300 * 01 35 03.0463381434 +30 37 08.434578391   17.78 18.17 18.0   ~ 7 0
20 IFM-B 2115 * 01 35 05.2 +30 41 16   18.99 18.79     ~ 2 0
21 IFM-B 2121 * 01 35 06.6 +30 41 51   18.5 18.50     ~ 2 0
22 IFM-B 2124 WR* 01 35 07.06 +30 41 43.7   18.5 18.50     ~ 3 0
23 NAME Romano's Star WR* 01 35 09.7011265200 +30 41 57.173367187   16.5 18.04     Ofpe/WN9 45 1
24 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1396 2
25 V* RX Cam cC* 04 04 58.4642958819 +58 39 35.218272520   8.85 7.70   6.233 G2Ib+A0V 177 0
26 HD 45677 Be* 06 28 17.4219761127 -13 03 11.130589443 7.86 8.52 8.50 8.11 8.01 B2IV/V[e] 304 0
27 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2212 0
28 V* AG Car WR* 10 56 11.5779283438 -60 27 12.809532379 7.00 7.57 6.96 7.73   WN11h 592 0
29 HD 186293 * 19 43 05.4509265754 +09 29 21.879579138   8.99 7.83     K0 16 0
30 HD 187428 * 19 49 11.6285255672 +19 47 41.398449539   8.66 7.94     F8Ib-II 33 0
31 [HS80] 89 As* ~ ~           ~ 10 0
32 [HS80] 88 As* ~ ~           ~ 8 0
33 [KSB2001] A * ~ ~   15.49       ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-08:14:07

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